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Chemical Industry Standard of the People's Republic of China
HG2316-92
Sulfur Suspension Concentrate
Published on June 1, 1992
Ministry of Chemical Industry of the People's Republic of China
Implemented on January 1, 1993
Chemical Industry Standard of the People's Republic of China
Sulfur Suspension Concentrate
Subject Content and Scope of Application
HG2316-92
This standard specifies the technical requirements, test methods, inspection rules, and marking, packaging, transportation and storage requirements for sulfur suspension concentrate. This standard applies to sulfur suspension concentrate made from sulfur, water and additives. Active ingredient: Sulfur
Chemical symbol: S
Relative atomic mass: 32.07 (according to the international relative atomic mass in 1989) Reference standards
GB1601
GB1604
GB1605
GB3796
GB5451
Method for determination of hydrogen ion concentration of pesticides
Rules for acceptance of pesticides
Sampling method for commercial pesticides
General rules for pesticide packaging
Method for determination of wettability of pesticide wettable powders HG2-896
Method for determination of fineness of pesticide powders
Technical requirements
3.1 Appearance: Flowable suspension that is easy to measure volume. Stratification is allowed after storage, but it can still return to its original state after shaking or stirring. Agglomeration is not allowed.
3.2 Sulfur suspension concentrate shall also meet the following index requirements: Item
Sulfur content, %(m/m)
Suspension rate, %(m/m)bzxZ.net
Sieve analysis, %(m/m) (through 0.045mm) sieve pH value
Average particle size\, um
Hot storage stability 2
Note: 1) and 2) shall be inspected at least once every six months. 4 Test method
4.1 Determination of sulfur content
4.1.1 Principle of method
Approved by the Ministry of Chemical Industry of the People's Republic of China on June 1, 199245% suspension concentrate
50% suspension concentrate
Implemented on January 1, 1993
HG2316-92
Sulfur is heated to reflux with sodium sulfite solution to convert it into sodium thiosulfate, which is then titrated with iodine standard titration solution. Excess sodium sulfite is masked with formaldehyde. The reaction equation is as follows:
S+Na2SOg-NaS2O3
I2+2NaS0=NaSO+2Nal
HCHO+Na2SO:+H2O-H,C(OH)SO:Na+NaOH4.1.2 Reagents and solutions
Anhydrous sodium sulfite (HG3-1078);
Formaldehyde (GB685);
Glacial acetic acid (GB676) solution; 20% (V/V); Iodine (GB675) standard titration solution: c(1/2I2)=0.1mol/L; Phenolphthalein indicator: 10g ethanol solution;
Starch indicator: 5g/L solution.
4.1.3 Apparatus
Spherical reflux condenser.
4.1.4 Determination steps
Weigh a sample containing 0.25% sulfur (accurate to 0.0001g), place it in a 250mL conical flask, add 50mL water and 5g sodium sulfite. Install a reflux condenser and heat it to boil for 15-20min. During the reflux, shake the conical flask from time to time. Remove the conical flask, cool it to room temperature, transfer the contents quantitatively to a 250mL volumetric flask, dilute it to the scale with water, shake it well, and filter it if necessary. Accurately draw 50mL of solution and place it in a 250mL conical flask, add 7mL of formaldehyde solution, let it stand for 3-5min, add 2 drops of phenol anhydride indicator, add glacial acetic acid solution until the red color disappears and 4-5 drops are excessive, then add 3mL of starch indicator, and titrate with iodine standard titration solution until the blue color (does not disappear within 30s) is the end point. Blank determination: weigh a sample containing 0.25g of sulfur (accurate to 0.0001g), place it in a 250mL conical flask, add an appropriate amount of water and shake vigorously to completely extract the water-soluble thiosulfate in the sample, and then make up to volume with water. Filter, accurately draw 50mL of the filtrate and place it in a 250mL conical flask, add 7mL of formaldehyde solution, and add 2 drops of indicator after standing for 3~5min, add glacial acetic acid solution until the red color disappears and 4~5 drops are excessive, then add 3mL of starch indicator, and titrate with iodine standard titration solution until the blue color (does not disappear within 30s) is the end point. 4.1.5 Calculate the mass percentage of sulfur in the sample3 according to the formula (1): )×0.03207×5×100
#1=c(mim2)
wherein: c-
the actual concentration of the iodine standard titration solution, mol/L; V-the volume of the iodine standard titration solution consumed when titrating the sample, mL; V2-the volume of the iodine standard titration solution consumed when titrating the blank, mL; the mass of the sample, ;
m2-the mass of the blank sample, g;
0.03207-the mass of sulfur in grams equivalent to 1.00mL of the iodine standard titration solution [c(1/212)=1.000mol/L]. 4.1.6 Allowable difference
The difference between the results of two parallel determinations should not be greater than 0.5%. 4.2 Determination of suspension rate
4.2.1 Method summary
Weigh 1g of sample and prepare a suspension in a measuring cylinder with standard hard water. Under specified conditions, determine the amount of sulfur in the bottom 1/10 suspension and sediment, and calculate its suspension rate.
4.2.2 Solution
Standard hard water: 342ppm, prepared according to the method in GB5451. 4.2.3 Instrument
HG2316-92
Measuring cylinder: with ground stopper, the distance between the 250mL scale line is 20~21.5cm, and the distance between the 250mL scale line and the bottom of the stopper is 4~6cm; glass pipette: about 40cm long, 0.5cm inner diameter, with a 0.2~0.3cm hole at one end, the tip is bent into a U shape, and the length of the U-shaped part is 0.5~1.0cm. The other end is connected to the suction source. 4.2.4 Determination steps
Measure 100mL of standard hard water into a 250mL measuring cylinder and place the measuring cylinder in a water bath at 30±1℃. Weigh a sample containing 0.45-0.50g of sulfur (accurate to 0.0001g) and place it in a 100mL beaker. Add 5-10mL (30±1℃) of standard hard water. Swirl the beaker. After the sample is self-wetted, add 50mL of standard hard water (30±1℃) while stirring. Use standard hard water (30±1℃) to transfer the sample quantitatively to the above measuring cylinder and dilute it to 250mL. Put the stopper in place and turn the measuring cylinder upside down 30 times at a speed of once every two seconds. Put it vertically in a water bath. The water bath liquid level should reach the neck of the measuring cylinder to prevent vibration. Open the stopper and keep it for 30 minutes. Then, draw out 9/10 of the suspension in the upper part of the measuring cylinder within 10-15 seconds. When drawing liquid, the tip of the pipette should be kept a few millimeters below the liquid surface to minimize stirring of the suspension. The 1/10 residue left by the measuring tube is washed several times with 30-40 mL of water and put into a 250 mL conical flask, and measured according to 4.1.4. 4.2.5 Calculation
Calculate the mass m4 of sulfur in the 1/10 residue according to formula (2), and then calculate the suspension rate of sulfur suspension according to formula (3): r2m4=cV×0.03207×5
ms-mX111.1
Where: c-——actual concentration of iodine standard titration solution, mol/; V—volume of iodine standard titration solution consumed to titrate 1/10 residue, mL; m3——mass of sulfur in the sample used to prepare the suspension, g; 111.1——conversion factor.
4.2.6 Allowable difference
The difference between the results of two parallel determinations of this method should not exceed 5%. 4.3 Sieve analysis
Determine according to the wet sieving method in HG2-896.
4.4 Determination of pH value
4.4.1 Reagents and solutions
Same as the pH meter method in GB1601.
4.4.2 Instruments and calibration
Carry out according to the pH meter method in GB1601.
4.4.3 Determination steps
Weigh 1g of sample and put it into a 100mL beaker containing about 50mL of water. Add water to 100mL and stir thoroughly for 1min. Let the suspension settle for 1min, and then determine the pH value of the mixture. 4.5 Determination of average particle size
4.5.1 Instrument
1000x biological microscope;
1/100 objective lens micrometer.
4.5.2 Determination steps
Take an appropriate amount of sulfur suspension, dilute it with water 100 to 200 times, stir it thoroughly to make it a uniform suspension, take a drop with a glass rod, drop it on a glass slide, and make a smear. Under a microscope, measure the average particle size of sulfur particles (200 to 300) in μm. 4.6 Hot storage stability test
4.6.1 Instrument
Oven: 54±2℃.
4.6.2 Determination steps
HG2316-92
Put the sample in a suitable glass bottle, place it in an oven at 54±2℃, and store it for 14 days. Take out the bottle and cool it naturally to room temperature. Complete the test within 24 hours. The sulfur content should still meet the standard requirements, and the suspension rate index should reach 92% of the value measured before hot storage. 5 Inspection rules
5.1 Sulfur suspension concentrate products shall be inspected by the quality supervision and inspection department of the manufacturer. The manufacturer shall ensure that the sulfur suspension concentrate shipped out of the factory meets the requirements of this standard. Each batch of sulfur suspension concentrate shipped out of the factory shall be accompanied by a quality certificate and comply with other provisions of GB1604. 5.2 The user has the right to verify whether the sulfur suspension concentrate received meets the requirements of this standard in accordance with the various provisions in the product standard. 5.3 Sulfur suspension concentrate products shall be considered as a batch in a volume not exceeding the capacity of the packaging storage tank. 5.4 The sampling method shall be carried out in accordance with GB1605.
5.5 In the inspection results, if any index does not meet the standard, re-sampling shall be carried out from twice the number of packages for verification. If only one index does not meet the requirements in the re-verification results, the entire batch of products shall be unqualified. 5.6 When the supply and demand parties have disputes over product quality, they can be resolved through negotiation or the statutory inspection agency can conduct arbitration analysis in accordance with the inspection methods specified in this standard.
6 Marking, packaging, transportation and purchase and storage
6.1 The marking and packaging of sulfur suspension shall comply with the relevant provisions of GB3796, and shall be marked with trademarks and production license numbers. 6.2 Sulfur suspension shall be packaged in clean and dry plastic bottles, with a net weight of 0.5, 1, 2 kg per bottle, and in cartons, with a net weight of no more than 20 kg per box. Other forms of packaging may also be used according to user requirements. 6.3 During storage and transportation, strictly prevent moisture and sunlight, maintain good ventilation, do not mix with food, seeds, and feed, avoid contact with skin, and prevent inhalation through the mouth and nose.
6.4 Under normal storage and transportation conditions, the warranty period of this product is 2 years. During the warranty period (after half a year), the suspension rate is allowed to drop to 95% of the indicated value, and the other indicators shall still meet the standard requirements. Additional remarks:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard was drafted and managed by the Shenyang Chemical Industry Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Ma Yaguang, Zheng Yong and Di Xingcun. This standard adopts the (United Nations) Food and Agriculture Organization FA018/7/S/5 (73) "Specifications for Sulfur Suspension Concentrates".
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