Some standard content:
ICS71.040.30
HG/T2890—1997
Registration No. 426—1997
This standard provides two levels: analytically pure and chemically pure. The analytically pure level is equivalent to the "zinc oxide" in the ACS (1987) standard. The differences are as follows.
1 Standard preparation
According to my country's national conditions, this standard adds three chapters: properties, inspection rules, packaging and marking. 2 Specifications
This standard has two more items than the ACS standard: clarity test and reduction of potassium permanganate. The two items of iron and silver are stricter than the ACS standard, and the other items are the same as the ACS standard.
3 Test
The determination method of the content of this standard is the same as that of the ACS standard, but the titration indicator used is different. The experiment shows that there is no significant difference in the results. The determination method of nitrate and iron is consistent with the original standard. The experiment shows that there is no significant difference in the results compared with the ACS standard. The determination methods of free chlorine and ammonium sulfide unprecipitated are basically the same as those of the ACS standard, but there are differences in the determination conditions. The experiment shows that there is no significant difference in the results. Other items all refer to the corresponding standards in a set of general test methods for chemical reagents that have been formulated in my country. This set of standards is basically formulated using ISO6353-1:1982 "Chemical Analysis Reagents Part 1: General Test Methods". This standard is formulated on the basis of GB1280-1977 "Chemical Reagent Zinc Oxide" standard. Compared with the original standard, corresponding changes have been made in specifications and test methods.
From the date of entry into force of this standard, the original GB1280-1977 is declared invalid. This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Beijing Chemical Reagent General Factory. This standard is drafted by Chengdu Chemical Reagent. The main drafters of this standard are: Chen Junru and Guo Shanpei. 842
Molecular formula: Zno
Chemical Industry Standard of the People's Republic of China
Chemical reagent
Zinc oxide
Chemical reagent--Zinc oxideRelative molecular weight: 81.39
1 Scope
HG/T 2890
This standard specifies the technical requirements, test methods, inspection rules, packaging and marking of chemical reagent zinc oxide. 2 Cited 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 601—1988
Chemical reagents-Preparation of standard solutions for titration analysis (volumetric analysis)GB/T 602--1988
GB/T 603--1988
Preparation of standard solutions for determination of impurities
Chemical reagents
Preparation of preparations and products used in test methodsChemical reagents
GB/T 610.2—1988
GB/T.619—1988
Chemical reagents-General method for determination of arsenic (silver diethyldithiocarbamate method) (eqvISO6353-1:1982)
Rules for sampling and acceptance of chemical reagents
GB/T6682-
GB/T 9723-1988
GB/T 9728—1988
GB/T 9729--1988
GB15346—1994
Specifications and test methods for water for analytical laboratories (eqvISO3696:1987)Chemical reagents 2
General rules for flame atomic absorption spectrometry
Chemical reagents
General method for determination of sulfate (eqvISO6353-1:1982)Chemical reagents
General method for determination of chloride (eqvISO6353-1:1982)Packaging and marking of chemical reagents
HG/T 3—1168—1978
3 Properties
Preparation and determination method of clarity standard of chemical reagents This reagent is a white or light yellow crystalline powder, insoluble in water, soluble in acid, ammonia water and alkali metal hydroxides, and absorbs carbon dioxide and moisture in the air.
4Specifications
Content (ZnO), %
Clarity test
Insoluble matter in dilute sulfuric acid, %
Approved by the Ministry of Chemical Industry of the People's Republic of China on April 21, 1997
Implementation on January 1, 1998
Free alkali
Chloride (CI), %
Sulfur compounds (in terms of SO.), %
Nitrate (NO3) %
Manganese (Mn), %
Iron (Fe), %
Arsenic (As), %
Lead (Pb), %
Reduced potassium permanganate substances (in terms of 0), %
Ammonium sulfide non-precipitate (in terms of sulfate), %5Test
HG/T 2890—1997
Table 1 (end)
Unless otherwise specified in this chapter, the standard titration solutions, standard solutions, preparations and products used shall be prepared in accordance with the provisions of GB/T601-1988GB/T602-1988 and GB/T603--1988. The water used in the experiment shall conform to the specifications of Grade 3 water in GB/T6682-1992, and the samples shall be weighed to an accuracy of 0.01g.
5.1 Content
Weigh 0.3g sample (accurate to 0.0001g), moisten with a small amount of water, add hydrochloric acid solution (20%) until the sample dissolves, add 75mL water, adjust the solution pH to 8 with ammonia solution (10%), add 10mL ammonia-ammonium fluoride buffer solution A (pH~10) and 50mg chrome black T indicator, and titrate with disodium ethylenediaminetetraacetic acid standard titration solution Cc(EDTA)=0.1 mol/LJ until the solution turns star blue. Perform a blank test at the same time.
The mass percentage is calculated according to formula (1):
X(%) = -: 81. 39 × 100
m × 1 000
Wherein: X—
mass percentage of zinc chloride, %;
volume of disodium ethylenediaminetetraacetic acid standard titration solution, mL; volume of disodium ethylenediaminetetraacetic acid standard titration solution in blank test, mL, V
concentration of disodium ethylenediaminetetraacetic acid standard titration solution, mol/L; molar mass of zinc oxide (M(ZnO)], g/mol; 81. 39-
The mass of the sample, g.
5.2 Clarity test
Weigh 6g of sample and dissolve it in 94mL of water and 6mL of sulfuric acid. The turbidity shall not be greater than the following clarity standards specified in HG/T3-1168-78:
Analytical pure
Chemical pure
5.3 Insoluble matter in dilute sulfuric acid
No. 3;
·No. 5.
Weigh 10g of sample and dissolve it in 160mL of sulfuric acid solution (1+15). After keeping it warm in a water bath for 1h, filter it with a No. 4 glass filter crucible that has been dried to constant weight at 105℃±2℃. Wash the filter residue with hot water until there is no sulfate reaction in the washing liquid. Dry it in an electric oven at 105℃±2℃ to constant weight. The mass of the filter residue shall not be greater than:
5.4 Free alkali
HG/T 2890 --- 1997
Analytically pure·
Chemically purebzxz.net
..2.0 mg.
Weigh 2 g of sample, add 20 mL of water, boil, filter and cool. Add 2 drops of phenolic acid indicator solution (10 g/L) to the filtrate, the solution shall not be pink.
5.5 Fluoride
Weigh 1 g of sample, add 5 mL of water, add nitric acid solution (25%) dropwise until the sample is dissolved, dilute to 20 mL, and measure according to GB/T9729-1988. The turbidity of the solution shall not be greater than that of the standard comparison solution. The preparation of the standard comparison solution is to take the following amount of chloride standard solution:Analytically pure
Chemically pure·
Diluted to 20 mL, and treated in the same way as the same volume of test solution. 5.6 Sulfur compounds
..0. 01 mg Cl
.0. 05 mg Cl.
Weigh 0.5 g sample, add 15 mL water, 0.2 mL anhydrous sodium carbonate solution (50 g/L) and 1 mL 30% hydrogen peroxide, slowly boil until the bubbles disappear, drop hydrochloric acid solution (20%) to dissolve, steam on a water bath until nearly dry, dissolve in water, dilute to 20 mL, add 0.After acidification with 5mL hydrochloric acid solution (20%), measure according to GB/T9728-1988. The turbidity of the solution shall not be greater than that of the standard comparison solution. The preparation of the standard comparison solution is to take the following amount of sulfate standard solution: analytical pure··
chemical pure
dilute to 20mL, and treat it in the same way as the same volume of test solution. 5.7 Nitrate
.....0. 05 mg SO..
..0. 10 mg SO..
Weigh 0.5g sample, add 10mL water, 1mL sodium chloride solution (100g/L) and 1mL indigo disulfonate sodium solution Cc(CiHsN,Naz0,S)=0.001mol/LJ, add 10mL sulfuric acid within 10s~15s under shaking, and let it stand for 10min. The blue color of the solution shall not be lighter than that of the standard comparison solution.
The preparation of the standard comparison solution is to take the following amount of nitrate standard solution: analytically pure...
chemically pure
and treat it in the same way as the sample.
-....0. 015 mg NO.?
.....0. 025 mg NO..
Weigh 2g of sample, add 35mL of water, 10mL of nitric acid, 5mL of sulfuric acid and 5mL of phosphoric acid, boil for 5min, cool, add 0.25g of potassium periodate, and boil for another 5min. The pink color of the solution shall not be darker than that of the standard comparison solution. The preparation of the standard comparison solution is to take the following amount of manganese standard solution: analytically pure
chemically pure
and treat it in the same way as the sample.
....0. 01 mg Mn;
..0. 02 mg Mn.
Weigh 1g sample, add 10mL water, add hydrochloric acid solution (20%) until the sample is dissolved, dilute to 20mL, add 2mL sulfosalicylic acid solution (100g/L), shake well, add 6mL ammonia water, shake well. The yellow color of the solution shall not be darker than that of the standard comparison solution. The preparation of the standard comparison solution is to take the following amounts of iron standard solution: analytical pure
chemical pure
dilute to 20mL, and treat it in the same way as the same volume of test solution. 5.10 Arsenic
0. 005 mg Fe:
..-0. 025 mg Fe.
HG/T 2890 -- 1997
Weigh 2g sample, place in an arsenic determination bottle, add 10mL water, drop hydrochloric acid solution (20%) until the sample is dissolved, dilute to 30mL, and measure according to GB/T610.2-1988. The purple-red color of the absorption liquid shall not be deeper than that of the standard comparison solution. The preparation of the standard comparison solution is to take the following amount of arsenic standard solution: analytical pure
chemical pure
dilute to 30mL, and treat it in the same way as the same volume of test solution. 5.11 Lead
Determine according to GB/T9723-1988, where: 5.11.1 Instrument conditions
Light source: lead hollow cathode lamp;
Wavelength: 283.3nm;
Flame: acetylene-air.
5.11.2 Determination method
...0. 001 mg As;
....0. 004 mg As.
Weigh 50g of sample, moisten with a small amount of water, add hydrochloric acid solution (20%) dropwise until the sample is dissolved, and dilute to 250mL. Take 25mL (5mL for chemically pure), a total of four portions, and determine according to 6.2.2 of GB/T9723-1988. 5.12 Potassium permanganate reduction substance
Weigh 4g (chemically pure 2g) sample, add 125mL sulfuric acid solution (1+5) to dissolve, add 0.1mL potassium permanganate standard titration solution [c(1/5KMnO,)=0.1mol/L] (if necessary, do a blank test, the amount of potassium permanganate standard titration solution added is 0.1mL+VomL), shake well, heat to boiling, the pink color of the solution must not disappear. The blank test is to measure 125mL sulfuric acid solution (1+5), a total of five portions, add proportional potassium permanganate standard titration solution [c(1/5KMnO)=0.1mol/L] respectively, shake well, heat to boiling, and take the volume of potassium permanganate standard titration bath solution that maintains light pink and has the smallest amount of potassium permanganate added in the series of solutions as the blank value V. 5.13 Ammonium sulfide does not precipitate
Weigh 2g of sample, add 20mL of water, add 5mL of acetic acid (glacial acetic acid), heat to dissolve, add 120mL of water without carbon dioxide, boil, add 15mL of freshly prepared saturated ammonium sulfide solution, shake, place for .3h~4h, and filter with dense dry filter paper. Discard the first 20mL of filtrate, take 80mL, evaporate to dryness on a water bath, heat to remove ammonium salt, and scatter the residue with 20mL of hot water and filter. The filtrate is placed in a crucible with constant weight at 800℃±25℃, add 0.5mL of sulfuric acid, evaporate to near dryness, heat until sulfuric acid vapor escapes, and burn to constant weight at 800℃±25℃. At the same time, perform a blank test. The difference in mass between the sample and the blank test residue shall not be greater than: analytical pure...
Chemical pure
6 Inspection rules
Sampling and acceptance shall be carried out in accordance with the provisions of GB/T619-1988. 7 Packaging and marking
Packaging, storage and transportation shall be carried out in accordance with GB15346--1994, and marking shall be given, including: Packaging unit: Class 4;
Inner packaging form: NB-4, NBY-4, NB-5, NBY-5, NB-7, NB-8, NB-10, NB-11.NB-13, NB-15; Isolation material: GC-2, GC-3;
Outer packaging form: WB-1, WB-2, WB-3.846
Weigh 50g of sample, moisten with a small amount of water, add hydrochloric acid solution (20%) until the sample dissolves, and dilute to 250mL. Take 25mL (5mL for chemically pure), a total of four portions, and measure according to 6.2.2 of GB/T9723-1988. 5.12 Reduction of potassium permanganate substances
Weigh 4g (2g for chemically pure) sample, add 125mL sulfuric acid solution (1+5) to dissolve, add 0.1mL potassium permanganate standard titration solution [c(1/5KMnO,)=0.1mol/L] (if necessary, do a blank test, the amount of potassium permanganate standard titration solution added is 0.1mL+VomL), shake well, heat to boiling, and the pink color of the solution must not disappear. The blank test is to take 125mL sulfuric acid solution (1 + 5), a total of five portions, add a proportion of potassium permanganate standard titration solution [c (1/5KMnO) = 0.1mol/L], shake well, heat to boiling, and take the volume of potassium permanganate standard titration bath solution that remains light pink and has the smallest amount of potassium permanganate added in the series of solutions as the blank value V. 5.13 Ammonium sulfide does not precipitate
Weigh 2g of sample, add 20mL of water, add 5mL of acetic acid (glacial acetic acid), heat to dissolve, add 120mL of carbon dioxide-free water, boil, add 15mL of newly prepared saturated ammonium sulfide solution, shake, let stand for .3h~4h, and filter with dense dry filter paper. Discard the first 20mL of filtrate, take 80mL, evaporate to dryness on a water bath, heat to remove ammonium salts, and take the residue with 20mL of hot water and filter. The filtrate is placed in a crucible at 800℃±25℃ and kept at constant weight. 0.5mL sulfuric acid is added and evaporated to near dryness. The sulfuric acid vapor is heated until it is completely exhausted and burned at 800℃±25℃ to constant weight. At the same time, a blank test is conducted. The difference in the mass of the residue between the sample and the blank test shall not be greater than: analytically pure…
chemically pure
6 Inspection rules
Sampling and acceptance shall be carried out in accordance with the provisions of GB/T619-1988. 7 Packaging and marking
Packaging, storage and transportation shall be carried out in accordance with GB15346--1994, and marking shall be given, including: Packaging unit: Class 4;
Inner packaging form: NB-4, NBY-4, NB-5, NBY-5, NB-7, NB-8, NB-10, NB-11.NB-13, NB-15; Isolation material: GC-2, GC-3;
Outer packaging form: WB-1, WB-2, WB-3.846
Weigh 50g of sample, moisten with a small amount of water, add hydrochloric acid solution (20%) until the sample dissolves, and dilute to 250mL. Take 25mL (5mL for chemically pure), a total of four portions, and measure according to 6.2.2 of GB/T9723-1988. 5.12 Reduction of potassium permanganate substances
Weigh 4g (2g for chemically pure) sample, add 125mL sulfuric acid solution (1+5) to dissolve, add 0.1mL potassium permanganate standard titration solution [c(1/5KMnO,)=0.1mol/L] (if necessary, do a blank test, the amount of potassium permanganate standard titration solution added is 0.1mL+VomL), shake well, heat to boiling, and the pink color of the solution must not disappear. The blank test is to take 125mL sulfuric acid solution (1 + 5), a total of five portions, add a proportion of potassium permanganate standard titration solution [c (1/5KMnO) = 0.1mol/L], shake well, heat to boiling, and take the volume of potassium permanganate standard titration bath solution that remains light pink and has the smallest amount of potassium permanganate added in the series of solutions as the blank value V. 5.13 Ammonium sulfide does not precipitate
Weigh 2g of sample, add 20mL of water, add 5mL of acetic acid (glacial acetic acid), heat to dissolve, add 120mL of carbon dioxide-free water, boil, add 15mL of newly prepared saturated ammonium sulfide solution, shake, let stand for .3h~4h, and filter with dense dry filter paper. Discard the first 20mL of filtrate, take 80mL, evaporate to dryness on a water bath, heat to remove ammonium salts, and take the residue with 20mL of hot water and filter. The filtrate is placed in a crucible at 800℃±25℃ and kept at constant weight. 0.5mL sulfuric acid is added and evaporated to near dryness. The sulfuric acid vapor is heated until it is completely exhausted and burned at 800℃±25℃ to constant weight. At the same time, a blank test is conducted. The difference in the mass of the residue between the sample and the blank test shall not be greater than: analytically pure…
chemically pure
6 Inspection rules
Sampling and acceptance shall be carried out in accordance with the provisions of GB/T619-1988. 7 Packaging and marking
Packaging, storage and transportation shall be carried out in accordance with GB15346--1994, and marking shall be given, including: Packaging unit: Class 4;
Inner packaging form: NB-4, NBY-4, NB-5, NBY-5, NB-7, NB-8, NB-10, NB-11.NB-13, NB-15; Isolation material: GC-2, GC-3;
Outer packaging form: WB-1, WB-2, WB-3.846
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