Some standard content:
GB18468—2001
Survey data show that urban and rural residents spend about 80% of their time indoors, and the health problems caused by indoor environmental pollution have attracted widespread attention. Paradichlorobenzene is a new type of mildew, moth-proof and deodorant. In recent years, it has been widely used in living rooms, household storage boxes, cabinets, toilets, library rooms and related places. However, unreasonable use will cause indoor air pollution and affect people's health. This standard collects the toxicity data, daily allowable exposure and related information of the International Program on Chemical Safety/World Health Organization (IPCS/WHO) paradichlorobenzene series, and completes toxicological supplementary research, small room volatility simulation test, and indoor air detection and investigation of residents using paradichlorobenzene preparations in China. On this basis, the limit value recommended by IPCS/WHO is equivalently adopted. Appendix A of this standard is the appendix of the standard. bzxZ.net
This standard is proposed by the Ministry of Health of the People's Republic of China. Drafting units of this standard: Jiangsu Provincial Health and Epidemic Prevention Station, Environmental Health Monitoring Institute of Chinese Academy of Preventive Medicine. Drafters of this standard: Zhang Xiuzhen, Li Yanping, Yin Xianren, Xu Qiang, Qian Song, Han Keqin. This standard is interpreted by the Institute of Environmental Health Monitoring, Chinese Academy of Preventive Medicine, entrusted by the Ministry of Health. 77
1 Scope
National Standard of the People's Republic of China
Hygiemic standard for p-dichlorobenzene in indoor air
Hygiemic standard for p-dichlorobenzene in indoor airGB 18468--2001
This standard specifies the daily average maximum allowable concentration and test method of p-dichlorobenzene (frog repellent, frog repellent, deodorant) in indoor air. This standard is applicable to the supervision, monitoring and hygienic evaluation of indoor air, and is not applicable to the indoor environment of production sites. 2 Referenced standards
The provisions contained in the following standards are incorporated into the provisions of this standard by reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest version of the following standards. IPCS/WHO Attached Documents. Exhibit \C\ Geneva,19913 Hygiene requirements
The daily average maximum permissible concentration of p-dichlorobenzene in indoor air is stipulated as 1.0mg/m2.4 Test method
This standard recommends that the test method is gas chromatography, 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 October 22, 200178
Implementation on March 1, 2002
A1 Principle
GB 18468-: 2001
Appendix A
(Appendix to the standard)
Test method for p-difluorobenzeneGas chromatography
Use activated carbon tube to collect p-dichlorobenzene in the air, desorb and sample with carbon disulfide, separate with FFA capillary column, and detect with oxygen ionization detector. Qualitative analysis is based on retention time and quantitative analysis is based on peak area. A2 Instruments
A2.1 Activated carbon tube: A glass tube with a length of about 150mm and an inner diameter of 5mm, filled with 200mg of GH-1 type activated carbon, fixed at both ends with glass wool and stainless steel mesh, sealed with silicone rubber caps at both ends, stored in a desiccator, and used within a short period of time. Activated carbon is activated by nitrogen at 350C for 4h before being loaded into the tube.
A2.2 Air sampler: flow range 0～1.0L/min, stable flow. Sampling after calibration. A2.3 Micro syringe, 10μl, 1±l volume scale should be calibrated. A2.4 Screw plug sample bottle: 4ml, screw cap lined with silicone rubber pad and polytetrafluoroethylene film seal, A2.5 Gas chromatograph: hydrogen flame ionization detector. A3 Reagents
A3.1 Activated carbon: coconut shell activated carbon, 20～40 mesh, use dry activated carbon sampling tube. A3.2 p-Dichlorobenzene: chromatographic grade.
A3.3 Carbon disulfide analysis Pure carbon disulfide contains many impurities and needs to be treated before redistillation. Treatment method: Take carbon disulfide and extract it repeatedly with 5% methyl alcohol concentrated sulfuric acid solution until the sulfuric acid solution is colorless, wash carbon disulfide with water until it is neutral, then dry it with anhydrous sulfuric acid, redistillate it, and store it in a refrigerator for later use.
A3.4 Acetone
A4 Sampling
When sampling, remove the plastic sealing caps at both ends of the activated carbon sampling tube, connect the gas outlet end of the sampling tube vertically to the air sampler, and collect 10L of gas at 0.5L/min. After sampling, put plastic caps on both ends of the tube, record the temperature and atmospheric pressure during sampling, and bring it back to the laboratory for analysis. A5 Analysis steps
A5.1 Gas phase manganese spectrum test conditions
FFAP chromatographic column: column length 30m, inner diameter 0.25mm, capillary column. Guiman: 120C.
Vaporization chamber temperature: 270C.
Detection chamber temperature: 280C.
Carrier gas (N) flow rate: 30ml./min, split ratio 20:1. A5.2 Control test: Bring the activated carbon tube to the site, but do not sample air, and analyze it at the same time as the sample tube as a control. A5.3 Sample treatment: Pour the activated carbon in the sampling tube into a screw-capped sample bottle, add 1mL of carbon disulfide, screw the bottle cap, and leave it for 60min, shaking it from time to time.
A5.4 Drawing of standard curve: Weigh p-dichlorobenzene accurately, dissolve it in acetone, prepare 250mg/ml acetone standard stock solution, dilute it 10 times with carbon sulfide before use, and then prepare 50, 200, 500, 1000μg/ml standard solutions. Take 1μL for injection, measure retention time 79
GB18468-2001
time and peak area, repeat 6 times for each concentration, take the average value of peak area, plot p-dichlorobenzene content against peak area, draw standard curve, and use retention time as qualitative index.
A5.5 Determination: Take 1uL of the above carbon disulfide analytical solution (5.3) for injection, and use retention time for qualitative analysis and peak area for quantitative analysis. Calculation
See formula (A1).
Where: X—concentration of p-dichlorobenzene in air, mg/m; C—amount of p-dichlorobenzene in carbon disulfide analytical solution, g, V. ——volume of sample under standard conditions, L. A7 Description
A7.1 Method detection limit: 10μg/mL carbon disulfide (injection of 1μL liquid sample). A7.2 Detection range: 10~500μg/mL. 80
(A1)
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