GB 18066-2000 Hygienic standard for ozone in the atmosphere of residential areas

This standard specifies the ozone health standard in the atmosphere of residential areas and its monitoring and inspection methods. This standard is applicable to the monitoring and evaluation of the atmospheric environment in urban residential areas. GB 18066-2000 Ozone health standard in the atmosphere of residential areas GB18066-2000 Standard download decompression password: www.bzxz.net

GB18066-2000
All technical contents of this standard are mandatory. Fore
To implement the "Environmental Protection Law of the People's Republic of China" and the "Law of the People's Republic of China on the Prevention and Control of Air Pollution", prevent and control the environmental pollution of residential areas caused by waste gas generated by industrial enterprises, and protect the health of the general public. This standard is formulated based on the principles of formulating health standards for harmful gases in the atmosphere, with reference to foreign research results, and based on the actual situation in my country. This standard shall be implemented from January 1, 2001. This standard is proposed by the Ministry of Health of the People's Republic of China. Appendix A of this standard is the appendix of the standard. The responsible drafting unit of this standard: Nanjing Medical University. The main drafters of this standard: Fang Qisheng, Wang Muyi, Chen Yulian, Gu Yiping, Li Xiangming. 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. 67
1 Scope
National Standard of the People's Republic of China
Hygienic standard for ozone in air of residential area
Hygienic standard for ozone in air of residential area This standard specifies the hygienic standard for ozone in air of residential area and its monitoring and inspection methods. This standard is applicable to the blue measurement and evaluation of the atmospheric environment in Jujia District, Echeng City. 2 Definitions
This standard adopts the following definitions.
2.1 Maximum permissible concentration per hour
The limit that the average concentration per hour shall not exceed. 3 Contents of the standard
3.1 The maximum permissible concentration per hour of ozone in air of residential area is 0.1mg/m3. 3.2 This standard uses the "borate potassium iodide colorimetric method" to determine ozone in air, see Appendix A. Approved by the State Administration of Quality and Technical Supervision on April 10, 200068
G180662000
Implementation on January 1, 2001
A1 Principle
GB 18066—2000
Appendix A
(Appendix to the standard)
Boric acid potassium iodide colorimetric method
Ozone is absorbed by 0.1mol/L (0.1M) boric acid solution containing 1% potassium iodide, displacing iodine. Then the colorimetric quantitative analysis is performed at a wavelength of 352nm.
The reaction formula is: O3+21-+2H+——I2+0 +H20. The chromium trioxide-quartz sand oxidation tube can oxidize nitric oxide into nitrogen dioxide, and nitrogen dioxide can also oxidize potassium iodide to precipitate iodine molecules. Therefore, the concentration of nitrogen dioxide should be measured at the same time when measuring ozone, and the part of nitrogen dioxide participating in the reaction should be subtracted from the ozone measurement. A2 Reagents
A2.1 Absorption solution: Weigh 6.2g of boric acid (H, BO3) and dissolve it in 750mL of water, transfer it into a 1.000mL brown volumetric flask, add 10.0g of potassium iodide (KI), and after dissolving, add 1mL of 0.0021% hydrogen peroxide (H20) aqueous solution. Dilute to the scale with water within 5min, mix thoroughly, and immediately use 1cm quartz colorimetric III to measure the optical density (E) at a wavelength of 352nm with water as the reference. After leaving it for 2h, measure the optical density (E2) again. If E1-E2≥0.008, the solution can be used; if E1-Ez0.008, the solution needs to be re-prepared. The pH of the absorption solution is 5.1±0.2.
A2.20.0021%H,02: Add 0.7mL30% hydrogen peroxide (HzO2) aqueous solution to 200mL water, place in a 500mL volumetric flask, and dilute with water to the mark. Take 5mL of this solution and dilute with water to 100mL to get 0.0021%HzOz solution. A2.31.0mol/L sulfuric acid solution
A2.4Ozone standard solution Weigh 1.0g potassium iodide, dissolve in water, transfer to a 100mL volumetric flask, add 10.00mL of 0.1000mol/L potassium iodate solution and 5mL of 1.0mol/LH,SO4 solution, dilute with water to the mark, to get 0.0100mol/L iodine solution, each mL of this solution is equivalent to 240μg ozone. Store in a dark place and it can be stable for one week. Before use, accurately measure this standard iodine solution and dilute it twice with the absorption liquid to make a standard solution containing 1.2ug/mL of ozone. A2.5 0.1000mol/L potassium iodate solution: Accurately weigh 0.3568g of potassium iodate (first grade) dried at 105℃ for 2h, dissolve it in water and transfer it to a 1000mL volumetric flask, add water to the scale, and shake well. A2.6 Chromium trioxide-quartz sand oxidation tube: Soak 10-20 mesh quartz sand in hydrochloric acid solution (1+2) for 12h, wash with water until neutral, and dry. Mix chromium trioxide with the above quartz sand at a ratio of 1:10 (weight ratio), adjust with a small amount of water to make the chromium trioxide fully adhere to the quartz sand, and dry in a 105℃ oven.
A3 Instrument
A3.1 Bubble absorption tube.
A3.2 Sampler: Flow range 0~1L/min. A3.3 UV/visible spectrophotometer.
A3.4 10mL stoppered colorimetric tube.
A4 Sampling
Use polytetrafluoroethylene tube to connect two bubble absorption tubes in series, each filled with 10mL absorption liquid, and connect a chromium trioxide-quartz sand oxidation tube at one end of the air inlet. Sampling at a flow rate of 0.5L/min for 20~30min (depending on the ozone concentration). 69
A5 Analysis steps
GB18066-2000
A5.1 Draw a standard curve: Take 7 10mL stoppered colorimetric tubes and prepare a standard series according to Table (A1). Table A1
Ozone standard series
Ozone standard solution, ml
Absorption liquid, ml.
Ozone content,
Put the stopper on the tube and shake well. Measure the optical density at a wavelength of 352nm with water as the reference. Draw a standard curve based on absorbance versus ozone content (μg). A5.2 Sample determination: After sampling, adjust the sample solution volume to 10.0mL with absorption liquid, and measure the absorbance according to the test steps for drawing the standard curve. Check the standard curve and get the odor content (). A6 Result calculationbzxz.net
Where: C.-Ozone concentration, mg/m.
The amount of ozone in the first absorption tube, ug;
b——The amount of ozone in the second absorption tube, "+6
V.-Converted to the sampling volume under standard conditions, L0.269
Nitrogen dioxide correction factor. That is, within 6 hours after sampling, 26.9% of nitrogen dioxide reacts with potassium iodide, and the nitrogen-containing compound concentration measured simultaneously is mg/. A7 Notes
A7.1 The detection limit of this method is 0.19 cells/10mL (calculated according to the ozone content corresponding to the absorbance of 0.01). When the sampling volume is 30L, the minimum detection concentration is 0.006mg/m .
A7.2SO, produces negative interference on ozone determination, but after passing through the chromium trioxide-quartz sand oxidation tube. It can remove sulfur dioxide equivalent to 100 times the ozone. Other oxidants such as peroxyacetyl nitrate, halogen gas, peroxide, organic nitrite, etc. can precipitate iodine and produce positive interference on this method.
A7.3 Iodine solution is unstable and is easy to volatilize and lose, so the container containing iodine solution must be covered. Drawing the standard curve must be completed within 20 minutes after preparing the standard solution, and the sampling time should not be too long. The colorimetry should be performed immediately after sampling. A7.4 Materials such as polytetrafluoroethylene and rubber will decompose ozone, so the pipe connecting the two absorption tubes should be made of polytetrafluoroethylene or glass tube, otherwise it is easy to cause ozone loss.
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