This standard specifies the maximum permissible concentration and time-weighted average permissible concentration of dioctyltin mercapto in workshop air and its monitoring and testing methods. This standard is applicable to various industrial enterprises that produce and use dioctyltin mercapto. GB ​​18547-2001 Occupational exposure limits for dioctyltin mercapto in workshop air GB18547-2001 Standard download decompression password: www.bzxz.net

GB18547—2001
This standard is formulated for the first time based on toxicological experiments, on-site labor hygiene surveys, epidemiological survey data and reference to foreign occupational exposure limits. It is a health standard for workplace environmental monitoring and health supervision. This standard shall be implemented from May 1, 2002. Appendix A of this standard is the appendix of the standard. This standard is proposed by the Ministry of Health of the People's Republic of China. This standard is drafted by the Jilin Provincial Institute of Labor Hygiene and Occupational Disease Prevention and Control. The main drafters of this standard are Sun Shuyun, Li Tao, Jun Hongyan, Zhao Haisheng and Zhao Zichen. This standard is entrusted to the Institute of Labor Hygiene and Occupational Disease Prevention and Control of the Chinese Academy of Preventive Medicine for interpretation. 1 Scope
National Standard of the People's Republic of China
Occupational exposure limit fur diactyltin-S,s'-bis(isooctylmercaptoacetate) in the air of workplaceGB 18547 2001
This standard specifies the maximum permissible concentration, time-weighted average permissible concentration and monitoring test method of diactyltin-S,s'-bis(isooctylmercaptoacetate) in the air of workplace.
This standard is applicable to all kinds of industrial enterprises producing and using diactyltin. 2 Hygiene requirements
The maximum allowable concentration of dithioctyltin in the workshop air is 0.2 mg/m3, and the time-weighted average allowable concentration is 0.1 mg/m3 (skin), measured in tin.
3 Monitoring and inspection methods
The monitoring and inspection methods of this standard use the original absorption method, see Appendix A (Appendix to the standard). Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on December 4, 2001 and implemented on May 1, 2002
A1 Principle
GB 18547-2001
Appendix A
(Appendix to the standard)
Determination method of atomic absorption of dimercaptooctyltin in workshop airDimercaptooctyltin (molecular formula CgHQ,S,Sn: trade name Sl)8831) in the air is absorbed by ethanol solution and the concentration of tin is measured by graphite furnace atomic absorption spectrometry at a wavelength of 224.6nm. A2 Instrument
A2.1 Large bubble absorption tube.
A2. 2 Air sampler: flow range (~1 J./m1m. A2.3 Colorimetric plug 20ml. bzxZ.net
All glass containers are soaked in 3.2 ml/L acid solution overnight, rinsed with distilled water 3 times, dried, soaked in water, rinsed with distilled water 3 times, dried. Finally, soaked in 50% (V/V) ethanol solution. Dust is dried and used for standby use. A2.4 Atomic absorption spectrophotometer, with background correction device graphite furnace and coated graphite tube and tin hollow cathode lamp. Operating conditions: wavelength 224.6nm, spectral passband 1.0nm. Lamp current 2nm, protective gas (argon), card 1000ml/mn external main gas 6(0) mL/m11n, use the background correction of the atmosphere lamp. A3 Reagents
A3.1 Absorption liquid: 50X (V/V) ethanol solution. A3.2 Anhydrous ethanol.
A3.3 Benzene,
A3.4 Mercaptooctyl tackifier: purity greater than 99.8% (V/V), liquid density is 1.056g/ml43.5 Standard solution: weigh 10mg dithiooctyltin, add anhydrous ethanol to 100mL to make 100μg/ml. Dithiooctyltin standard solution.
A4 Sampling
Use a large bubble absorption tube filled with 5ml of absorption liquid and evacuate air at a flow rate of 0.5L/mm for 1min. A5 Analysis Steps
A5,1 Control experiment: Place the absorption tube filled with absorption liquid at the sampling point. Except for not introducing air, the rest of the operations are the same as the sample as a blank control of the sample.
A5.2 Sample treatment: Use the absorption liquid in the absorption tube to wash the absorption tube inlet tube three times, mix well, pour the absorption liquid into the colorimetric tube, seal it tightly and store it in the refrigerator for testing. If the concentration of dithiothiophene in the air on site is low, add a little benzene to concentrate the sample. , the extract is used for testing.
A5.3 Draw a standard curve: Take the standard solution and dilute it with the absorption solution to 0.0, 2.5, 5.0, 10.01g/ml. Standard series, adjust the original absorption spectrophotometer to the best operating conditions. Take 20 tubes. Inject once for each concentration, measure the absorbance, deduct the absorbance of tube 0, and take the average value. Draw a standard curve by plotting the concentration of dithiocarbazin against the average absorbance. 45.4 Determination: Use the same conditions as the determination of the standard series, take 20μL of sample for analysis, measure the absorbance, and calculate the sample absorbance value. After subtracting the blank control value, the concentration of dithiooctyltin in the sample is found from the standard curve. A6 Calculation
GB18547-2001
A6.1 Convert the sampling volume to the volume under standard conditions according to formula (A1). 273
Where: - converted to the volume of the sample under standard conditions, L sampling volume, L
- air temperature at the sampling location, kPa;
- air temperature at the sampling location, C.
A6.2 Calculate the air tin concentration according to formula (A2). G-exV
X 0. 157 88
Air concentration, g/m*
Dithiooctyltin concentration found on the standard curve·/mV-absorption liquid volume, ml.
V. - converted to the sample volume under standard conditions, L; 0.157 88-
A7 Description
-The proportion of tin in dithiothiotin,
A7.1 The detection limit of this method is 0.3μg/ml. The minimum detection concentration is 0.2mg/m (collecting 51 air). The linear range of this method is 0.5~~5 g/mL, and the relative standard deviation is 4%. A7.2 The spike recovery rate of this method is 94%, and the sampling efficiency is 92 accurate. A7.3 It is a monotonically increasing function in the concentration range of 104 to 10". A7.4 When sampling with ethanol-water soluble wave, the interference of tin-containing dust in the air and other metal elements insoluble in water and ethanol on tin can be eliminated.
A7.5 If the air contains only one organic compound, mercaptooctyltin, the measurement result is the content of tin in dioctyl tin: If the air contains multiple organic tin compounds, the measurement result refers to the total amount of various organic tin compounds.
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