This standard specifies the sanitation standard for the discharge of cyanide-containing waste residues in industrial production. This standard is applicable to industrial production, such as the bottom mud after the treatment of wastewater from low-carbon workpiece heat treatment and surface treatment process, and other cyanide-containing industrial waste residues. GB 18053-2000 Sanitation standard for cyanide in industrial waste residues GB18053-2000 standard download decompression password: www.bzxz.net

GB18053—2000
All technical contents of this standard are mandatory. Foreword
This standard is formulated based on leaching tests, toxicity studies and on-site hygiene investigations, and with reference to foreign research results, in order to implement the "Environmental Protection Law of the People's Republic of China" and prevent and control the pollution of the environment by harmful substances in industrial waste residues. This standard shall be implemented from January 1, 2001. Appendix A and Appendix B of this standard are both appendices to the standard. This standard is proposed by the Ministry of Health of the People's Republic of China. The responsible drafting unit of this standard is Chengdu Municipal Health and Epidemic Prevention Station. The main drafters of this standard are Tao Rui and Ren Yuzhen. This standard is entrusted by the Ministry of Health to the Institute of Environmental Health Monitoring of the Chinese Academy of Preventive Medicine for interpretation. 714
1 Scope
National Standard of the People's Republic of China
Hygienic standard for cyanide in industrial waste
Hygienic standard for cyanide in industrial waste This standard specifies the hygienic standard for the discharge of cyanide-containing waste residues in industrial production. GB18053—2000
This standard applies to industrial production, such as low-carbon workpiece heat treatment, surface treatment process wastewater treatment of sludge and other cyanide-containing industrial waste residues.
2 Standard content
2.1 According to the leaching test method specified in this standard, the cyanide (in CN-) health standard value in the waste residue leaching solution is ≤1.5mg/L.
2.2 Leaching test method: See Appendix A (Appendix to the standard). 2.3 Monitoring and inspection method: See Appendix B (Appendix to the standard). Approved by the State Administration of Quality and Technical Supervision on April 10, 2000 and implemented on January 1, 2001
GB18053—2000
Appendix A
(Appendix to the standard)
Cyanide leaching test method
Take the waste residue sample, remove the small metal residue in it, and then crush and sieve it. Take 10.0g of the sample from the 0.5-5mm part, add 100mL of distilled water with a pH of 5.8-6.3, and place at room temperature (20-25℃) and normal pressure (about 1 atmosphere). Oscillate continuously for 6 hours at a frequency of 200 times/min and an amplitude of 40-50mm. Filter the leaching solution with medium-speed filter paper. The filtrate is used for cyanide determination. Appendix B
(Standard Appendix)
Cyanide Monitoring Test Method
B1 Principle
The sample is distilled in an acidic sulfuric acid solution containing magnesium chloride. Inorganic cyanide is evaporated as hydrogen cyanide. Collected in a sodium hydroxide solution. Cyanide ions are oxidized to cyanogen chloride by chloramine T in an alkaline solution below pH 8. Then react with pyridine-barbituric acid to generate a purple-red dye, which is determined colorimetrically.
B2 Reagents
B2.1 Magnesium chloride solution: weigh 510g of magnesium fluoride (MgCl, ·6H,O), dissolve in appropriate amount of water, dilute to 1000mL. B2.2 1+1 sulfuric acid solution.
B2.3 10% sodium hydroxide solution.
B2.4 0.25mol/L sodium hydroxide solution
B2.5 1mol/L sodium dihydrogen phosphate solution: weigh 138g of sodium dihydrogen phosphate (NaH,PO, ·H,O), dissolve in appropriate amount of water, dilute to 1000ml, and store in the refrigerator for use.
B2.6 1% chloramine T solution, store in the refrigerator, prepare weekly. B2.7 Pyridine-barbituric acid solution: weigh 15g of barbituric acid and transfer to a 250mL volumetric flask. Wash the wall of the volumetric flask with an appropriate amount of water and wet all the barbituric acid, add 75mL of pyridine and mix. Then add 15mL of concentrated hydrochloric acid and mix well. Cool to room temperature. Finally, dilute with water to the scale. Mix well.
B2.8 Silver nitrate indicator: weigh 0.02g of silver nitrate (p-dimethylaminobenzylidene rhodanine) and dissolve it in 100mL of acetone. B2.9 0.0192mol/L silver nitrate standard solution: accurately weigh 3.2617g of silver nitrate dried at 105~110C, dissolve it in water, and dilute to 1000mL. If necessary, calibrate it with standard sodium chloride solution. The method is as follows: Preparation of sodium chloride standard solution: accurately weigh 1.169g of sodium chloride burned at 500~600C, dissolve it in water, and dilute to 1000mL. The molar concentration of this solution is 0.0200mo1/L. Take 20.0mL of sodium chloride standard solution, place it in magnetic evaporator III, add 20mL of water, and take another 40mL of water as blank. Add 1mL of 5% potassium chromate solution respectively, and titrate with silver nitrate standard solution until brick red precipitation is produced. The concentration of silver nitrate can be obtained by formula (B1).
C=0. 02 ×20
Where: C,
Silver nitrate concentration, mol/L;
Amount of silver nitrate standard solution, mL;
Concentration of sodium chloride standard solution, mol/L;
·(B1)
GB18053—2000
20--Volume of sodium chloride standard solution used, mL. B2.10 Cyanide standard stock solution: Weigh 2.51g of potassium cyanide and 2g of potassium hydroxide, dissolve in appropriate amount of water, and dilute to 1000mL. Calibrate its accurate concentration before use.
Calibration method: Accurately pipette 25.0mL of cyanide standard stock solution into a 150mL conical flask. Adjust the pH to above 11 with 10% sodium hydroxide solution. Add 0.5mL of test silver indicator and titrate with 0.0192mol/L silver nitrate solution until the orange-red color is the end point. Calculate the concentration of cyanide solution. Each milliliter of 0.0192mol/L silver nitrate solution is equivalent to 1.00mg cyanide (CN). B2.11 Cyanide standard working solution: Accurately pipette an appropriate amount of cyanide stock solution (containing 10.0mg cyanide), transfer it into a 1000mL volumetric flask, dilute to the mark with 0.25mol/L sodium hydroxide solution, and mix. This solution contains 10.0μg cyanide (CN-) per milliliter. Pipet 10.0mL of this solution into a 100mL volumetric flask, dilute to the mark with 0.25mol/L sodium hydroxide solution, and mix. Each 1 ml of this solution is equivalent to 1.0 μg of cyanide (CN).
B3 Instruments
B3.1 Visible spectrophotometer.
B4 Analysis steps:
B4.1 Preparation of test solution: Refer to Appendix A, accurately aspirate 100 mL of leaching solution, transfer it into a 1000 mL distillation flask, add water to 500 mL, then add 20 mL of magnesium chloride solution and 50 mL of 1+1 sulfuric acid, and heat for distillation. The distillate is collected in a 250 mL volumetric flask containing 25 mL of 10% sodium hydroxide solution, collect the distillate to the scale, mix it and use it for determination. B4.2 Determination: Accurately aspirate an appropriate amount of leaching solution, transfer it into a 50 mL stoppered colorimetric tube, dilute it to 20 mL with 0.25 mol/L sodium hydroxide solution, and add 15 mL of phosphate buffer solution. Mix thoroughly. Add 2 mL of 1% chloramine T solution and mix thoroughly. Immediately add 5 mL of pyridine-barbituric acid solution, mix again, dilute to scale with water, mix thoroughly and color for 8 minutes. Using the reagent blank as a control, use 1 cm colorimetric blood to measure the absorbance at a wavelength of 578 nm (the measurement should be completed within 7 minutes). Find the amount of equivalent cyanide from the standard curve. B4.3 Preparation of standard curve: Pipette 0.0, 0.20, 0.50, 1.00, 2.00, 4.00 and 6.00 mL of the standard working solution containing 1 μg of cyanide per milliliter respectively into a 50 mL stoppered colorimetric tube, and dilute to 20 mL with 0.25 mol/L sodium hydroxide solution. The following steps are performed according to B4.2. Draw the absorbance-cyanide concentration relationship curve. B4.4 Calculation of results
The cyanide in the waste residue (in terms of CN-) is calculated according to formula (B2): C
Concentration of cyanide in the waste residue, mg/kg;
Wherein: C2
A——equivalent cyanide standard content, ug; V is the volume of the test solution taken for determination, mL;
250Total volume of the test solution, mL;
100——weight of the dry sample, g. www.bzxz.net
B5 Precision and accuracy
(B2)
The precision of this method is expressed as the relative standard deviation. In the range of 0.2 to 6g of cyanide, the value of repeated determination for 7 times is 4.0% to 0.6%; the accuracy is expressed as the recovery rate of spiked addition, and the measured recovery rate is 96% to 101%. 717
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