1 Scope
This standard specifies indoor air quality parameters and inspection methods.
This standard applies to residential and office buildings.
2. Normative references
The clauses in the following documents have been adopted as references to this standard. For dated reference documents, all subsequent amendments (excluding errata content) or revisions do not apply to this standard. However, the parties concerned are encouraged to use the latest versions of these documents for research. For undated references, the latest version is applicable to this standard.
GB 6921-86 Determination of airborne dust concentration method Gravimetric method
GB 9801-88 Air quality - Determination of carbon monoxide Non-dispersive infrared method
GB 11737-89 Standard Method for Sanitary Test of Benzene, Toluene and Xylene in Atmosphere of Residential Areas Gas Chromatography
GB 12372-90 Saltzman method for the improvement of standard methods for the determination of nitrogen dioxide in residential air
GB/T 14679-93 Determination of ammonia for air quality Sodium hypochlorite-salicylic acid spectrophotometric method
GB/T 14669-93 Determination of Ammonia in Air Quality Ion Selective Electrode Method
GB/T 14582-93 Standard Measurement Method for Helium in Ambient Air
GB 14677-93 air quality determination of toluene, xylene, styrene gas chromatography
GB/T 15262-94 Determination of sulfur dioxide in ambient air Formaldehyde absorption - Pararosaniline photospectrophotometry
GB/T Determination of nitrogen dioxide in ambient air by the Saltzman method
GB/T Determination of ambient air ozone UV spectrophotometric method
GB/T Ambient air benzo[a]pyrene determination by high performance liquid chromatography
GB/T Determination of formaldehyde in air quality acetylacetone spectrophotometric method
GB/T Standard method for the inspection of sulfur dioxide in the air of residential areas Formaldehyde solution absorption - Pararosaniline hydrochloride spectrophotometric method
GB/T Spectrophotometric method for the determination of formaldehyde in the air in residential areas
GB/T Concentration control standard in housing
GB/T Scintillation flask measuring method for radon concentration in air
GB/T Sanitary Standards for Inhalable Particles in Indoor Air
GB/T 18204.18-2000 Methods for measuring indoor air volume in public places - Tracer gas method
GB/T 18204.23-2000 Test method for carbon monoxide in air of public places
GB/T 18204.24-2000 Test method for carbon dioxide in air in public places
GB/T 18204.25-2000 Test method for ammonia in air of public places
GB/T 18204.26-2000 Determination of formaldehyde in air in public places
GB/T 18204.27-2000 Ozone inspection method in air of public places
5 Indoor Air Quality Inspection
5.1 The sampling and inspection methods of various chemical pollutants in indoor air are shown in Appendix A and Appendix B.
5.2 Determination of benzene concentration in indoor air is given in Appendix C.
5.3 The test method for total volatile organic compounds (TVOC) in indoor air is given in Appendix D.
5.4 Test methods for total bacteria in indoor air are shown in Appendix E.
5.5 Test methods for indoor thermal environment parameters are given in Appendix F.
Appendix A
(Normative Appendix)
Indoor Air Sampling Technical Guidelines
1 Scope
This guideline stipulates sampling points, sampling height, sampling time and frequency, sampling methods and quality assurance measures when monitoring indoor air pollutants. This guideline serves as the guiding principle for the air sampling technology supported by the "Indoor Air Quality Standard" and is applicable to the sampling of various chemical pollutants specified in the "Indoor Air Quality Standard."
2, the selection requirements
2.1 Number of sampling points: The number of sampling points is determined according to the size of the indoor area of ​​the monitoring room and on-site conditions in order to correctly reflect the level of indoor air pollutants. In principle, rooms with less than 50m2 should be set at 1~3 points; 50~100m2 with 3~5 points; and 100m2 with at least 5 points. Diagonally or evenly distributed over the quincunx.
2.2 The sampling point should avoid the vent and the distance from the wall should be greater than 0.5m.
2.3 Height of sampling point: In principle, it is consistent with the height of human respiratory belt. The relative height is between 0.5m~1.5m.
3, sampling time and frequency
Close doors and windows for at least 4 hours before sampling. The average daily concentration is sampled continuously for at least 18 hours, the 8-hour average concentration is sampled continuously for at least 6 hours, and the 1-hour average concentration is sampled continuously for at least 45 minutes.
4, sampling methods and sampling equipment
According to the presence of contaminants in the indoor air, appropriate sampling methods and instruments are selected. The noise of the sampler used in the room should be less than 50 dB. The specific sampling method should be carried out according to the methods and operating procedures specified in each pollutant inspection method.
5, sampling quality assurance measures
5.1 Air tightness inspection: The dynamic sampler shall inspect the airtightness of the sampling system before sampling, and shall not leak gas.
5.2 Flow calibration: The flow rate of the sampling system should be kept constant. Before sampling and after sampling, a primary soap film meter should be used to calibrate the sampling system's intake air flow, with an error of no more than 5%.
Sampler flow calibration: When the sampler is in normal use, calibrate the scale of the sampler flowmeter with a soap meter, calibrate 5 points, and plot the flow standard curve. Record atmospheric pressure and temperature during calibration.
5.3 Blank Inspection: In a batch of on-site sampling, two sampling tubes should be left without sampling, and treated as other sample tubes as a blank test during the sampling process. If the blank test exceeds the control range, the batch of samples is invalidated.
5.4 Before using the instrument, the instrument should be inspected and calibrated according to the instrument instructions.
5.5 When calculating the concentration, apply the following equation to convert the sample volume to the volume in the standard state:
Where V 0 - is converted into a sample volume under standard conditions, L;
V - sample volume, L;
T 0 - the absolute temperature of the standard state, 273K;
T - the sum of the sample site temperature (t) and the absolute temperature of the standard state at the time of sampling, (t + 273) K;
P 0 - atmospheric pressure under standard conditions, 101.3kPa;
P - Atmospheric pressure at the sampling point during sampling, kPa.
5.6 For each parallel sampling, the relative deviation of the measured difference from the average value does not exceed 20%.
6, records and reports
When sampling, detailed records shall be made of the site conditions, various sources of pollution, sampling date, time, location, quantity, distribution method, atmospheric pressure, air temperature, relative humidity, wind speed, and sampler's signature, and shall be reported to the laboratory with the sample.
Appendix B
(Normative Appendix)
Test Method for Various Parameters in Indoor Air*
Sources of contaminant testing methods
(1) Sulphur dioxide SO 2 absorption in formaldehyde solution - Pararosaniline hydrochloride spectrophotometric method (1) GB/T
(2) GB/T 15262-94
(2) Nitrogen dioxide NO 2 modified Saltzaman method (1) GB/12372-90
(2) GB/T
(3) Carbon monoxide CO (1) Non-dispersive infrared method
(2) Non-dispersive infrared gas analysis, gas chromatography, mercury replacement method (1) GB 9801-88
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(4) Carbon dioxide CO 2 (1) Irradiation infra-red gas analysis
(2) Gas chromatography
(3) Capacity titration method GB/T 18204.24-2000
(5) Ammonia NH3 (1) Indophenol Blue Spectrophotometry
Nessler Spectrophotometry
(2) Ion selective electrode method
(3) Sodium hypochlorite-salicylic acid spectrophotometry (1) GB/T 18204.25-2000
(2) GB/T 14669-93
(3) GB/T 14679-93
(6) Ozone 0 3 (1) UV Spectrophotometry
(2) Indigo-sodium disulfonate spectrophotometric method (1) GB/T
(2) GB/T 18204.27-2000
(7) Spectrophotometry of formaldehyde HCHO ? AHMT
Phenol reagent spectrophotometry
Gas chromatography
(3) Acetylacetone Spectrophotometry (1) GB/T 16129-95
(2) GB/T 18204.26-2000
(3) GB/T 15516-95
(8) Benzene C 6 H 6 Gas Chromatography? Appendix C
(2) GB 11737-89
(9) Toluene C 7 H 8 ,
Xylene C 8 H 10 gas chromatography GB 14677-93
(10) Benzo[a]pyrene
B(a)P high pressure liquid chromatography GB/T
(11) Respirable particles
PM10 impact type - weighing method GB/T
(12) Total volatile organics
TVOC Gas Chromatography Appendix D
(13) Bacterial Count Impact Method Appendix E
(14) Temperature, Relative Humidity, and Air Flow Rate Thermal Environment Parameters Test Method Appendix F
(15) New Air Volume Tracing Gas Method GB/T18204.18-2000
(16) Rn (1) Scintillation vial concentration measurement in air
(2) Standard Measurement Method for Radon in Ambient Air (1) GB/T
(2) GB/T 14582-93
* Note: The inspection method (1) is the arbitration law.