Some standard content:
QB/T2488-2000
This standard is drafted and formulated based on the analysis and research of aloe products for many years, with reference to the aloe product standards of the International Aloe Science Association (IASC) in the late 1990s, the aloe product standards of internationally renowned aloe product manufacturers (such as Aloecorp in the United States), and the relevant regulations of the People's Republic of my country. This standard is proposed by the Industry Management Department of the State Bureau of Light Industry. This standard is under the jurisdiction of the Light Industry Standardization Research Institute. The drafting units of this standard are: Beijing Technology and Business University, China Rural Technology Development Center of the Ministry of Science and Technology, and Light Industry Standardization Research Institute. The main drafters of this standard are: Zhang Xiaohua, Du Haiyan, Zhu Shuqin, Xu Rigong, and Jiao Yuying. 250
1 Scope
Light Industry Standard of the People's Republic of China
Aloe Vera Products for Cosmetics
QB/T 2488—2000
This standard specifies the definition, classification, technical requirements, test methods, inspection rules and marking, packaging, transportation, storage and other requirements for aloe vera products for cosmetics.
This standard applies to aloe vera products for cosmetics. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 2828--1987
Sampling procedures and sampling tables for batch inspection by attributes (applicable to inspection of continuous batches) GB/T 2829—1987
Sampling procedures and sampling tables for periodic inspection by attributes (applicable to inspection of stability of production process) GB/T 7917. 1—1987
GB/T 7917. 2--1987
GB/T 7917. 3-1987
GB/T 7918.2—1987
GB/T 7918. 3--1987
GB/T 7918. 4—1987
GB/T 7918. 5---1987
3 Definitions
This standard adopts the following definitions.
3.1 Aloe vera gel products
Standard test methods for cosmetic sanitation and chemistry Mercury Standard test methods for cosmetic sanitation and chemistry Monument Standard test methods for cosmetic sanitation and chemistry Lead Standard test methods for cosmetic microbiology Total bacterial count Standard test methods for cosmetic microbiology
Fecal coliform group
Standard test methods for cosmetic microbiology
Remove Pseudomonas aeruginosa
Standard test methods for cosmetic microbiology
Staphylococcus aureus
Liquid products obtained by processing the thin-walled tissue of the aloe leaf peeled off. 3.2 Whole leaf aloe vera products
Liquid products obtained by processing aloe leaves. 3.3 Decolorized aloe vera products
Decolorized aloe vera gel products or whole leaf aloe vera products. 3.4 Concentrated aloe vera products
Aloe vera products concentrated in a certain proportion after removing part of the water. Aloe vera products concentrated according to 2.1 are called aloe vera gel 2:1 concentrated liquid (or whole leaf aloe vera 2:1 concentrated juice), and so on. Unconcentrated aloe vera products are called aloe vera gel 1:1 stock solution (or whole leaf aloe vera 1:1 stock juice). After dilution and replenishment of the original water content, the concentrated aloe vera products have the characteristics of aloe vera gel 1:1 stock solution (or whole leaf aloe vera 1:1 stock juice).
3.5 Spray-dried powder
A powdery product obtained by spray drying an aloe vera gel product (or whole leaf aloe vera product) without fillers. After dilution and replenishment of the original water content, it has the characteristics of aloe vera gel 1:1 stock solution (or whole leaf aloe vera 1:1 stock juice). 3.6 Freeze-dried powder
A powdered product obtained by freeze-drying aloe vera gel products without fillers. After dilution and replenishment of the original water, it has the characteristics of 1:1 aloe vera gel stock solution.
4 Product classification
Aloe vera products for cosmetics are divided into two categories: aloe vera gel products (excluding the outer skin of aloe vera leaves) and whole leaf aloe vera products (including the outer skin of aloe vera leaves).
4.1 Aloe vera gel products
Based on the form and concentration of aloe vera gel products, they are divided into the following 16 categories: a) Aloe vera gel 1:1 stock solution;
b) Decolorized aloe vera gel 1:1 stock solution;
c) Aloe vera gel 2:1 concentrate;
d) Decolorized aloe vera gel 2:1 concentrate;
e) Aloe vera gel 4:1 concentrate;
f) Decolorized aloe vera gel 4:1 concentrate;
g) Aloe vera gel 10:1 concentrate condensate;
h) decolorized aloe vera gel 10:1 concentrate; i) aloe vera gel 20:1 concentrate;
j) decolorized aloe vera gel 20:1 concentrate; k) aloe vera gel 40:1 concentrate;
1) decolorized aloe vera gel 40:1 concentrate1
m) aloe vera gel 200:1 spray dried powder; n) decolorized aloe vera gel 200:1 spray dried powder; p) aloe vera gel 200:1 freeze dried powder; q) decolorized aloe vera gel 200:1 freeze dried powder. 4.2 Whole leaf aloe products
Based on the shape and concentration of whole leaf aloe products, they are divided into the following 14 categories: a) whole leaf aloe 1:1 original juice;
b) decolorized whole leaf aloe 1:1 original juice;
c) whole leaf aloe 2:1 concentrated juice;
d) decolorized whole leaf aloe 2:1 concentrated juice;
e) whole leaf aloe 4:1 concentrated juice;
f) decolorized whole leaf aloe 4:1 concentrated juice ;
g) Whole leaf aloe 10:1 concentrated juice;
h) Decolorized whole leaf aloe 10:1 concentrated juice; i) Whole leaf aloe 20:1 concentrated juice;
j) Decolorized whole leaf aloe 20:1 concentrated juice; k) Whole leaf aloe 40:1 concentrated juice;
1) Decolorized whole leaf aloe 40:1 concentrated juice; m) Whole leaf aloe 100:1 spray dried powder; n) Decolorized whole leaf aloe 100:1 spray dried powder. 252
5 Technical requirements
5.1 Sensory indicators
Sensory indicators shall comply with the requirements of Tables 1 to 8. QB/T 2488-
Table 11:1 Sensory indicators of aloe vera products
Color stability
(50% aqueous solution)
Color stability
(50% aqueous solution)
(25% aqueous solution)
Color stability
(25% aqueous solution)
(10% aqueous solution)
Color stability
(10% aqueous solution)
Unbleached
Yellow liquid
Gel products
Colorless liquid
Unbleached
Whole leaf products
Yellow-green liquid
Aloe plant flavor (no peculiar smell)
Exposure to ultraviolet light for 6 hours, should not change color or slightly change color Table 22:1 Sensory indicators of concentrated aloe products
Gel products
Unbleached
Yellow liquid
Colorless liquid
Whole leaf products
Unbleached
Yellow-green liquid
Aloe plant flavor (no peculiar smell)
Exposure to ultraviolet light for 6 hours, should not change color Or slightly discolored Table 34:1 Sensory indicators of concentrated aloe products
Gel products
Not bleached
Amber liquid
Colorless liquid
Whole leaf products
Not bleached
Amber liquid
Aloe vera smell (no odor)
Exposure to ultraviolet light for 6 hours, should not change color or slightly change color Table 410:1 Sensory indicators of concentrated aloe products
Gel products
Not bleached
Amber liquid with trace precipitation
Off-white liquid
Whole leaf products
Unbleached
Amber liquid with trace precipitation
Colored liquid
Asparagus plant flavor (no peculiar smell)
Exposure to ultraviolet light for 6 hours should not change color or change color slightly TriKAoNiKAca
Colorless liquid
Colorless liquid
Colorless liquid
Off-white liquid
(5% aqueous solution)
Color stability
(5% aqueous solution)
(2.5% aqueous solution)
Color stability
(2.5% aqueous solution)
QB/T 2488-
Table 520:1 Sensory indicators of concentrated aloe vera products
Gel products
Unbleached
Yellow-brown
Viscous liquid with trace precipitation
Light yellow viscous liquid
Unbleached
Whole leaf products
Brown-yellow
Viscous liquid with trace precipitation
Aloe vera plant flavor (no odor)
Exposure to ultraviolet light Irradiate under line light for 6 hours, it should not change color or change color slightly Table 640:1 Sensory indicators of concentrated aloe products
Gel products
Unbleached
Yellow-brown
viscous liquid with trace precipitation
Light yellow viscous liquid
Light yellow viscous liquid
Whole leaf products
Unbleached
Brown-yellow
viscous liquid with trace precipitation
Aloe plant Taste (no peculiar smell)
Exposure to ultraviolet light for 6 hours, should not change color or slightly change color Table 7
(1% aqueous solution)
Color stability
(1% aqueous solution)
100:1 Whole leaf spray dried powder Aloe product sensory index
Unbleached
Brown powder
Aloe plant flavor (no peculiar smell)
Light yellow viscous liquid
Light yellow Color powder
Exposure to ultraviolet light for 6 hours should not change color or slightly change color3200:1Gel dried powderAsparagus products sensory index table 8
(0.5% aqueous solution)
Color stability
(0.5% aqueous solution)
5.2Physical and chemical indexes
Spray dried powder products
Unbleached
Brown powder
Physical and chemical indexes should comply with the requirements of Tables 9 to 16. 254
Off-white powder
Freeze-dried powder
Not bleached
Brown fine powder
Aloe plant flavor (no peculiar smell)
Exposure to ultraviolet light for 6 hours should not change color or slightly change color
Off-white fine powder
Absorbance (400nm)
Relative density
Total solids, %
Polysaccharides, mg/L
Absorbance (400nm, 50% aqueous solution)|| tt||pH (50% aqueous solution)
Relative density
Total solids, %
Calcium, mg/l
Magnesium, mg/L
Polysaccharides, mg/L
Absorbance (400nm.25% aqueous solution)
pH (25% aqueous solution)
Relative density
Total solids, %
Calcium + mg/L
Magnesium, mg/L
Polysaccharides.mg/L
QB/T 2488--2000
Table 91:1 Physical and chemical indicators of aloe products
Gel products
Unbleached
Unbleached
3.5~4.7
1. 000~1. 008
9. 82 X 10~ 4. 48 × 102
2. 34 X10~1. 18 X102
≥6.00×102
Table 102:1 Physical and chemical indicators of concentrated aloe products
Gel products
Unbleached
Whole leaf products
4. 48×102 ~1. 02×103
3. 30 ×10~2. 30 ×102
≥3.00× 102
Whole leaf products
Not bleached
1.000~~1.009
1.96 × 102 ~8.96 ×102
4.68X10~2.36X102
≥1.20×103
Table 114:1 Physical and chemical indicators of concentrated aloe products
Gel products
Not bleached
8.96 X 102 ~2.04 X103
6.60×10~4. 60×102
≥6.00×102
Whole leaf products
Unbleached
1. 001~1. 011
3. 93× 103 ~ 1. 79 × 103
9. 36×10~~4. 72×103
≥2. 40×103
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1. 79×103~4. 08X103
1. 32×102~ 9. 20×102
≥1.20×103
Absorbance (400nm, 10% aqueous solution)
pH (10% aqueous solution)
Relative density
Total solids, %
Magnesium, mg/l
Polysaccharides, mg/L
Absorbance (400nm, 5% aqueous solution)
pH (5% aqueous solution)
Relative density
Total solids, %
Magnesium, mg/L|| tt||Polysaccharide.mg/L
Absorbance (400nm, 2.5% aqueous solution)
PH (2.5% aqueous solution)
Relative density
Total solids.%
Calcium.mg/l.
Polysaccharide, mg/L
QB/T2488-2000
Table 1210:1 Physical and chemical indicators of concentrated aloe vera products
Gel products
Unbleached
Unbleached
1. 002~1. 022
9.82×102~4.48×103
2. 34X102 ~1. 18X103
≥6.00×103
20:1Physical and chemical indicators of concentrated aloe vera products
Gel products
Not decolorized
Whole leaf products
4. 48×103 ~1. 02× 10
3. 30×102 ~ 2. 30 × 103
≥3.00×103
Whole leaf products
Not decolorized
1.004~1. 028
1. 96×103 ~8. 96×103
4. 68 X102 ~ 2. 36 ×103
≥1.20×104
Table 1440:1 Physical and chemical indicators of concentrated aloe vera products
Gel products
Not bleached
8. 96 X 103 ~ 2. 04 X 101
6. 60X102 ~ 4. 60 X103
≥6.00×103
Whole leaf products
Not bleached
1.010~1.050
3. 93X103~1. 79 ×104
9. 36X103-4. 72×103
≥2.40×10+
1. 79 ×10*~4. 08 ×10
1. 32× 103 ~ 9. 20 ×103
≥1.20×104
Absorbance (400nm, 1% aqueous solution)
pH (1% aqueous solution)
Water content, %
Calcium.mg/kg
Magnesium.mg/kg
Polysaccharide, mg/kg
QB/T2488-2000
Table 15100:1 Physical and chemical indicators of whole leaf spray-dried powder aloe products
Unbleached
4. 48× 10 -1. 02 × 105
3. 30 × 103 ~~2. 30 × 101
≥3.00×104
200:1 Gel-dried powder aloe vera product physical and chemical index table 16
Spray-dried powder product
Unbleached
Absorbance (400nm, 0.5% aqueous solution)
pH (0.5% aqueous solution)
Water, %
Calcium.mg/kg
Magnesium, mg/kg
Polysaccharide, mg/kg
Sanitary indicators
Sanitary indicators should comply with the provisions of Table 17.
Lead, mg/L or mg/kg
Mercury.mg/L or mg/kg
Monument, mg/L or mg/kg
Total number of bacteria, pieces/mL or pieces/g
Fecal coliform group
Staphylococcus aureus
Pseudomonas aeruginosa
Test method
Freeze-dried powder products
Not decolorized
1. 96×104~8. 96×104
4. 68X103~2. 36X104
≥1.20×10s
Table 17 Hygienic indicators of aloe products
Not detectable (per gram or per milliliter of aloe products)Not detectable (per gram or per liter of aloe products)Not detectable (per gram per liter of aloe products)5.0
The water used in this test refers to deionized water or distilled water when no other requirements are specified. When the solvent used to prepare the solution is not specified, it refers to the aqueous solution
The reagents used are analytically pure unless otherwise specified. When the reagents in the test method do not specify the specific concentration, they refer to the concentration of commercially available reagents. 6.1 Appearance
TiKAoNniKAca
QB/T 2488—2000
Place the sample on a white lining and observe with the naked eye under non-direct sunlight conditions. 6.2 Odor
Weigh the aloe sample equivalent to 50g (accurate to 0.1g) of 1:1 stock solution (or 1:1 original juice) and dilute it with water to the corresponding concentration specified in the color stability index of aloe products. Stir continuously to make it completely dissolved. Check by sense at room temperature. 6.3 Color stabilityWww.bzxZ.net
6.3.1 Apparatus
a) Petri dish with quartz glass cover: 98cm; b) Colorimetric tube with stopper: 25ml;
c) Ultraviolet lamp: 20W.
6.3.2 Preparation of test solution
Weigh the aloe sample equivalent to 50g (accurate to 0.1g) of 1:1 stock solution (or 1:1 original juice) and dilute it with water to the corresponding concentration specified in the color stability index of aloe products. Stir continuously to make it completely dissolved. Divide the test solution into two parts for later use. 6.3.3 Operation
Put one portion of the test solution (6.3.2) in a stoppered colorimetric tube for reference. Put another portion of the test solution (6.3.2) in cultured blood. Place the cultured blood under an ultraviolet lamp, cover it with a quartz glass cover, and irradiate it vertically at a distance of 30 cm for 6 hours. Then, transfer the test solution to a stoppered colorimetric tube, place it on a white lining, and compare it with the reference under non-direct sunlight conditions. 6.4 Absorbance
6.4.1 Instrument
Spectrophotometer.
6.4.2 Preparation of test solution
Weigh 50g (accurate to 0.001g) of 1:1 stock solution (or 1:1 original juice) of aloe sample, and dilute it with water to the corresponding concentration specified by the absorbance index of aloe products. Stir continuously to dissolve it completely and set aside. 6.4.3 Analysis Procedure
Use 1 cm colorimetric blood, adjust to zero with deionized water, and determine the absorbance of the test solution (6.4.2) at a wavelength of 400 nm. 6.5 pH
6.5.1 Reagents
a) Deionized water that has been boiled and cooled, does not contain carbon dioxide and is protected from absorption of carbon dioxide. b) Two commonly used buffer solutions are selected to calibrate the pH meter. Their pH should be as close as possible to the expected value of the sample solution. The buffer solutions are prepared with water (6.5.1a).
6.5.2 Instruments
a) pH meter, including temperature compensation system, with an accuracy of ±0.02 pH; b) Combination electrode or glass electrode and calomel electrode. 6.5.3 Preparation of test solution
Weigh 250g (accurate to 0.1g) of 1:1 stock solution (or 1:1 juice) of Aloe vera sample and dilute it with water (6.5.1a) to the corresponding concentration specified by the pH index of aloe products. Stir continuously to dissolve it completely, cool it to (25±1)°C or room temperature, and set aside (if there is insoluble matter, filter it and set aside).
6.5.4 Analysis steps
6.5.4.1 Calibration
According to the manufacturer's instructions of the instrument, calibrate the pH meter at the specified temperature using the selected two standard buffer solutions, or calibrate it under the temperature compensation system.
6.5.4.2 Determination
The temperature of the electrode, washing water and standard buffer solution or sample solution should be adjusted to (25±1)°C, the closer the temperature is, the better, or they should be adjusted to room temperature at the same time. 258
QB/T 2488—2000
After the instrument is calibrated, first wash the electrode with water (6.5.1a), and then with the test solution (6.5.3). Add a sufficient volume of test solution to the measuring container to immerse the electrode, wait until the pH meter reading is stable for 1 minute, and record the reading. Repeat this operation with another fresh test solution. 6.5.5 Expression of analysis results
If the two determination results meet the allowable difference, take the arithmetic mean of the two determination results as the result, and report the result to the first decimal place.
6.5.6 Allowable difference
The difference between the two determination values of the same sample should not exceed 0.1 pH unit. 6.6 Total solids
6.6.1 Instruments and equipment
a) Electric constant temperature drying oven: temperature control range 30℃~100℃, error ±2℃; b) Flat weighing bottle: d5cm;
c) Dryer: containing anhydrous calcium chloride.
6.6.2 Analysis steps
6.6.2.1 Take a clean weighing bottle and place it in an electric constant temperature drying oven at 45℃60℃, heat for 6h, take it out and place it in the dryer to cool to ambient temperature, weigh it (accurate to mg), and repeat drying to constant weight (the difference in mass before and after does not exceed 2mg, which is constant weight). 6.6.2.2 Add about 6g of the sample to the weighing bottle that has been weighed. After weighing (accurate to mg), place it in an electric constant temperature drying oven and dry it at 45C~60C for 24h. Quickly move the sample from the electric constant temperature drying oven to the desiccator, cool to ambient temperature, and weigh (accurate to mg). Place it in the desiccator for 2 hours and weigh it again. If the difference between the two weighings is greater than 2 mg, place it in the electric constant temperature drying oven and continue to dry for 6 hours, and repeat the above operation from "quickly move the sample from the electric constant temperature drying oven to the desiccator" until the difference between the two weighings is less than 2 mg, which is constant weight.
6.6.3 Calculation of analysis results
The total solid content in the sample is calculated according to formula (1) and expressed as a percentage. Xi (%) = m2 = mo × 100..
Where: X, — total solid content in the sample; m. Mass of weighing bottle, g,
ml——mass of weighing bottle and sample, g; m2——mass of weighing bottle and sample after drying, g. (1)
If the results of two measurements meet the allowable difference, the arithmetic mean of the two measurements shall be taken as the result, and the result shall be reported to the second decimal place.
6.6.4 Allowable difference
The difference between the two measured values of the same sample shall not exceed 5% of the average value of the two measurements. 6.7 Moisture
6.7.1 Instruments and equipment
a) Electric thermostat in the drying oven with a temperature control range of 50℃～250℃ and an error of ±2℃; b) Flat weighing bottle: d5cm;
c) Desiccator: Contain anhydrous calcium chloride.
6.7.2 Analysis steps
6.7.2.1 Take a clean weighing bottle, place it in a 95℃～105℃ drying oven, heat it for 0.5h～1.0h, take it out and place it in a dryer to cool for 0.5h, weigh it (accurate to mg), and repeat drying until constant weight (the difference between the two weights does not exceed 2mg, which is constant weight). 6.7.2.2 Put about 1g of the ground sample into the weighing bottle with constant weight. After weighing (accurate to mg), place it in a 95℃～~105℃ drying oven, dry it for 2h～4h, take it out and place it in a dryer to cool for 0.5h, and then weigh it. Then put it in a 95℃105℃ drying oven to dry for about 1h, take it out, place it in a dryer to cool for 0.5h, and then weigh it again. When the difference between the two weights does not exceed 2mg, it is constant weight. 259
TiKAONi KAca-
6.7.3 Calculation of analysis results
QB/T 24882000
The moisture content in the sample is calculated according to formula (2) and expressed as a percentage. X,=
Moisture content in the sample,%;
Where: X,-
m----The mass of the weighing bottle and the sample?g;
m.—-Mass of weighing bottle and sample after drying, g; ms-mass of weighing bottle?g.
If the results of two measurements meet the allowable difference, take the arithmetic mean of the two measurements as the result, and report the result to the first decimal place.
6.7.4 Allowable difference
The difference between the two measured values of the same sample shall not exceed 5% of the average value of the two measurements. 6.8 Relative density
6.8.1 Summary of method
Relative density refers to the ratio of the mass of a substance to the mass of pure water of the same volume and temperature. Generally, relative density refers to the relative density at 20C.
6.8.2 Instruments and equipment
a) Super constant temperature water bath;
b) 25mL specific gravity bottle with thermometer: as shown in Figure 1. e
1 Pycnometer; 2--Branch mark; 3 Small cap on branch, 4--Bottle with thermometer Figure 1 Pycnometer with thermometer
6.8.3 Analysis steps
Take a clean, dry and weighed (accurate to 0.001g) pycnometer, fill it with sample, place it in a 20℃ water bath for 0.5h, let the temperature of the contents reach 20C, cover the bottle cap, and use a fine filter paper to absorb the sample on the branch mark, cover the small cap and take it out, wipe the outside of the pycnometer dry with filter paper, place it in the balance room for 0.5h, and weigh it (accurate to 0.001g). Then pour out the sample, wash the pycnometer, fill it with water, and operate according to the above-mentioned "immerse in a 20℃ water bath for 0.5h". There should be no bubbles in the pycnometer, and the temperature in the balance room should not exceed 20℃. 6.8.4 Calculation of analysis results
The relative density of the sample is calculated according to formula (3).
Where: X: -- relative density of a sample, m6--mass of the pycnometer, g;
m.--mass of the pycnometer and water, .
m,--mg
m--mass of the pycnometer and sample·g. QB/T 2488-2000
If the results of two determinations meet the allowable difference, the arithmetic mean of the two determinations shall be taken as the result, and the reported result shall be rounded to four significant figures. 6.8.5 Allowable difference
The difference between the two determinations of the same sample shall not exceed 0.5% of the average value of the two determinations. 6.9 Calcium and magnesium
6.9.1 Determination range
The minimum detection concentrations of calcium and magnesium measured by this method are 0.3mg/kg and 0.02mg/kg respectively. 6.9.2 Method Summary
Calcium and magnesium ground state atoms can absorb the resonance line emitted by the hollow cathode lamp of the metal element, and the absorption intensity is proportional to the concentration of calcium and magnesium atoms. Digest the aloe vera product to make calcium and magnesium exist in the test solution in ionic state. Introduce the test solution into a flame atomizer to atomize calcium and magnesium ions, and then measure their absorbance at their sensitive resonance lines of 422.7nm and 285.2nm respectively, and compare with the standard series for quantitative determination. Both can be measured with air-acetylene flame.
6.9.3 Reagents
a) Nitric acid: high-grade pure;
b) Perchloric acid: high-grade pure;
c) Mixed acid: 5 parts of nitric acid (6.9.3a) and 1 part of perfluoric acid (6.9.3b) are mixed in the ratio (5+1); d) Hydrochloric acid: high-grade pure;
e) Lanthanum oxide;
f) Potassium thiocyanate solution (10%);
g) Hydrochloric acid solution (c(HCl)=0.2mol/LJ): Measure 16.7mL of hydrochloric acid (6.9.3d), add water to 1000ml; h) Hydrochloric acid solution (10%): Measure 277mL of hydrochloric acid (6.9.3d), add water to 1000ml. i) Hydrochloric acid solution (1%): Measure 27.7mL of hydrochloric acid (6.9.3d), add water to 1000ml; j) Calcium carbonate: spectrally pure. Dry to constant weight at 105℃; k) Calcium standard stock solution: Weigh 24.97g of calcium carbonate (6.9.3j), add about 180ml of 10% hydrochloric acid solution (6.9.3h). Dissolve it, transfer it to a 1000mL volumetric flask, and dilute it to the mark with 0.2mol/L hydrochloric acid solution (6.9.3g). 1.00mL of this standard stock solution is equivalent to 10.00mg of calcium
1) Magnesium oxide: spectrally pure. Dry to constant weight at 105C; m) Magnesium standard stock solution: weigh 1.658g of magnesium oxide (6.9.31), dissolve it with 30mL of 10% hydrochloric acid solution (6.9.3h), transfer it to a 1000mL volumetric flask, and dilute it to the mark with 1% hydrochloric acid solution (6.9.3i). 1.00mL of this standard solution is equivalent to 1.00mg of magnesium; n) Mixed standard solution of calcium and magnesium: transfer 20.00mL of calcium standard stock solution (6.9.3k) and 10.00mL of magnesium standard stock solution (6.9.3m) to a 1000mL volumetric flask, and dilute to the mark with deionized water. This standard solution 1.00mL contains 200.00μg of calcium and 10.00μg of magnesium; p) Lanthanum ion solution (5%): weigh 29.32g of lanthanum oxide (6.9.3e), add 60mL of water and 60mL of hydrochloric acid (6.9.3d), dissolve it, transfer it to a 500mL volumetric flask, and dilute it to the scale with water. 6.9.4 Instruments and equipment
a) Atomic absorption spectrophotometer (with flame atomizer and calcium and magnesium hollow cathode lamps) b) Air compressor or air cylinder:
c) Acetylene gas cylinder;
d) Bent-neck funnel;
e) Adjustable electric furnace;
f) Quantitative filter paper.
6.9.5 Analysis steps
6.9.5.1 Instrument test parameters (see Table 18) 261
-TTi KAONi KAca-3b) Mix according to (5+1), d) Hydrochloric acid: high-grade pure;
e) Lanthanum oxide;
f) Potassium thiocyanate solution (10%);
g) Hydrochloric acid solution (c(HCl)=0.2mol/LJ: measure 16.7mL of hydrochloric acid (6.9.3d), add water to 1000ml; h) Hydrochloric acid solution (10%): measure 277mL of hydrochloric acid (6.9.3d), add water to 1000ml. i) Hydrochloric acid solution (1%): measure 27.7mL of hydrochloric acid (6.9.3d), add water to 1000mL; j) Calcium carbonate: spectrally pure. Dry at 105℃ to constant weight; k) Calcium standard stock solution: weigh 24.97g of calcium carbonate (6.9.3j), add about 180ml of 10% hydrochloric acid solution (6.9.3h) to dissolve, transfer to a 1000ml volumetric flask, and dilute to scale with 0.2mol/L hydrochloric acid solution (6.9.3g). 1.00ml of this standard stock solution is equivalent to 10.00mg of calcium
1) Magnesium oxide: spectrally pure. Dry at 105℃ to constant weight; m) Magnesium standard stock solution: weigh 1.658g of magnesium oxide (6.9.31), dissolve with 30ml of 10% hydrochloric acid solution (6.9.3h), transfer to a 1000ml volumetric flask, and dilute to scale with 1% hydrochloric acid solution (6.9.3i). 1.00 mL of this standard solution is equivalent to 1.00 mg of magnesium; n) Mixed standard solution of calcium and magnesium: Pipette 20.00 mL of calcium standard stock solution (6.9.3k) and 10.00 mL of magnesium standard stock solution (6.9.3m) into a 1000 mL volumetric flask, and dilute to the mark with deionized water. 1.00 mL of this standard solution contains 200.00 μg of calcium and 10.00 μg of magnesium; p) Lanthanum ion solution (5%): Weigh 29.32 g of lanthanum oxide (6.9.3e), add 60 mL of water and 60 mL of hydrochloric acid (6.9.3d), dissolve it, transfer it to a 500 mL volumetric flask, and dilute to the mark with water. 6.9.4 Instruments and equipment
a) Atomic absorption spectrophotometer (with flame atomizer and calcium and magnesium hollow cathode lamps) b) Air compressor or air cylinder:
c) Acetylene gas cylinder;
d) Bent-neck funnel;
e) Adjustable electric furnace;
f) Quantitative filter paper.
6.9.5 Analysis steps
6.9.5.1 Instrument test parameters (see Table 18) 261
-TTi KAONi KAca-3b) Mix according to (5+1), d) Hydrochloric acid: high-grade pure;
e) Lanthanum oxide;
f) Potassium thiocyanate solution (10%);
g) Hydrochloric acid solution (c(HCl)=0.2mol/LJ: measure 16.7mL of hydrochloric acid (6.9.3d), add water to 1000ml; h) Hydrochloric acid solution (10%): measure 277mL of hydrochloric acid (6.9.3d), add water to 1000ml. i) Hydrochloric acid solution (1%): measure 27.7mL of hydrochloric acid (6.9.3d), add water to 1000mL; j) Calcium carbonate: spectrally pure. Dry at 105℃ to constant weight; k) Calcium standard stock solution: weigh 24.97g of calcium carbonate (6.9.3j), add about 180ml of 10% hydrochloric acid solution (6.9.3h) to dissolve, transfer to a 1000ml volumetric flask, and dilute to scale with 0.2mol/L hydrochloric acid solution (6.9.3g). 1.00ml of this standard stock solution is equivalent to 10.00mg of calcium
1) Magnesium oxide: spectrally pure. Dry at 105℃ to constant weight; m) Magnesium standard stock solution: weigh 1.658g of magnesium oxide (6.9.31), dissolve with 30ml of 10% hydrochloric acid solution (6.9.3h), transfer to a 1000ml volumetric flask, and dilute to scale with 1% hydrochloric acid solution (6.9.3i). 1.00 mL of this standard solution is equivalent to 1.00 mg of magnesium; n) Mixed standard solution of calcium and magnesium: Pipette 20.00 mL of calcium standard stock solution (6.9.3k) and 10.00 mL of magnesium standard stock solution (6.9.3m) into a 1000 mL volumetric flask, and dilute to the mark with deionized water. 1.00 mL of this standard solution contains 200.00 μg of calcium and 10.00 μg of magnesium; p) Lanthanum ion solution (5%): Weigh 29.32 g of lanthanum oxide (6.9.3e), add 60 mL of water and 60 mL of hydrochloric acid (6.9.3d), dissolve it, transfer it to a 500 mL volumetric flask, and dilute to the mark with water. 6.9.4 Instruments and equipment
a) Atomic absorption spectrophotometer (with flame atomizer and calcium and magnesium hollow cathode lamps) b) Air compressor or air cylinder:
c) Acetylene gas cylinder;
d) Bent-neck funnel;
e) Adjustable electric furnace;
f) Quantitative filter paper.
6.9.5 Analysis steps
6.9.5.1 Instrument test parameters (see Table 18) 261
-TTi KAONi KAca-
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