Yulin Diesel Engine has a clear competitive advantage

1. Scope

This standard outlines the parameters for indoor air quality and specifies the corresponding inspection methods. It is designed to ensure that the air quality in residential and office environments meets acceptable health and comfort levels. The standard is applicable to both newly constructed and existing buildings used for residential or office purposes.

2. Normative References

The following documents are referenced in this standard. For dated references, only the editions cited apply. For undated references, the latest version of the document is considered applicable. Users are encouraged to use the most up-to-date versions where possible.

GB 6921-86 - Gravimetric method for determination of airborne dust concentration

GB 9801-88 - Non-dispersive infrared method for determination of carbon monoxide in air

GB 11737-89 - Gas chromatography method for benzene, toluene, and xylene in residential area atmosphere

GB 12372-90 - Saltzman method for nitrogen dioxide in residential air

GB/T 14679-93 - Sodium hypochlorite-salicylic acid spectrophotometric method for ammonia in air

GB/T 14669-93 - Ion selective electrode method for ammonia in air

GB/T 14582-93 - Standard measurement method for helium in ambient air

GB 14677-93 - Gas chromatography for toluene, xylene, and styrene in air

GB/T 15262-94 - Formaldehyde absorption-pararosaniline photometric method for sulfur dioxide in ambient air

GB/T 15435-1995 - Saltzman method for nitrogen dioxide in ambient air

GB/T 15438-1995 - UV spectrophotometric method for ozone in ambient air

GB/T 15439-1995 - High performance liquid chromatography for benzo[a]pyrene in ambient air

GB/T 15516-1995 - Acetylacetone spectrophotometric method for formaldehyde in air

GB/T 16128-1995 - Formaldehyde solution absorption-pararosaniline hydrochloride spectrophotometric method for sulfur dioxide in residential air

GB/T 16129-1995 - Spectrophotometric method for formaldehyde in residential air

GB/T 16146-1995 - Concentration control standard for housing

GB/T 16147-1995 - Scintillation flask method for radon concentration in air

GB/T 17095-1997 - Sanitary standards for inhalable particles in indoor air

GB/T 18204.18-2000 - Tracer gas method for measuring indoor air volume in public places

GB/T 18204.23-2000 - Carbon monoxide test method for public place air

GB/T 18204.24-2000 - Carbon dioxide test method for public place air

GB/T 18204.25-2000 - Ammonia test method for public place air

GB/T 18204.26-2000 - Formaldehyde determination method for public place air

GB/T 18204.27-2000 - Ozone inspection method for public place air

5. Indoor Air Quality Inspection

5.1 The sampling and testing methods for various chemical pollutants in indoor air are detailed in Appendix A and Appendix B.

5.2 Benzene concentration in indoor air is determined according to the procedures outlined in Appendix C.

5.3 The test method for total volatile organic compounds (TVOC) in indoor air is provided in Appendix D.

5.4 Methods for determining total bacteria in indoor air are described in Appendix E.

5.5 Procedures for measuring thermal environment parameters in indoor air are given in Appendix F.

Appendix A

(Normative Appendix)

Indoor Air Sampling Technical Guidelines

1. Scope

This guideline provides technical instructions on selecting sampling points, setting sampling height, determining sampling time and frequency, choosing sampling methods, and implementing quality assurance measures. It serves as a reference for sampling techniques required by the "Indoor Air Quality Standard" and applies to all chemical pollutants specified in the standard.

2. Sampling Point Selection

2.1 Number of Sampling Points: The number of sampling points depends on the size of the monitored room and site conditions. Generally, rooms with less than 50 m² should have 1–3 points; 50–100 m² should have 3–5 points; and rooms larger than 100 m² should have at least 5 points, distributed diagonally or evenly.

2.2 Sampling points should avoid vents and be placed more than 0.5 meters away from walls.

2.3 Sampling height should align with the human breathing zone, typically between 0.5 m and 1.5 m.

3. Sampling Time and Frequency

Doors and windows should remain closed for at least 4 hours before sampling. For average daily concentration, sampling should last at least 18 hours. For 8-hour average, at least 6 hours. For 1-hour average, at least 45 minutes.

4. Sampling Methods and Equipment

Appropriate sampling methods and instruments should be selected based on the type of contaminant. The noise level of the sampler must be below 50 dB. Specific methods should follow the procedures outlined in each pollutant test method.

5. Quality Assurance Measures

5.1 Air-tightness check: Before sampling, the dynamic sampler must be checked for leaks.

5.2 Flow calibration: The flow rate of the sampling system should be stable. Use a soap film meter before and after sampling, with an error margin of no more than 5%.

5.3 Blank test: In each batch of samples, two tubes should be left uncollected and treated as blanks during analysis. If the blank exceeds the control range, the entire batch is invalid.

5.4 Instruments must be inspected and calibrated before use according to the manufacturer's guidelines.

5.5 When calculating concentrations, use the following formula to convert sample volume to standard conditions:

V₀ = V × (T₀ / T) × (P / P₀)

Where Vâ‚€ is the volume under standard conditions, V is the sample volume, Tâ‚€ is the absolute temperature at standard conditions (273 K), T is the sum of the sampling site temperature and 273 K, Pâ‚€ is the atmospheric pressure at standard conditions (101.3 kPa), and P is the atmospheric pressure at the sampling location.

5.6 For parallel sampling, the relative deviation from the average value should not exceed 20%.

6. Records and Reports

Detailed records should be made during sampling, including site conditions, pollution sources, date, time, location, number of samples, distribution method, atmospheric pressure, air temperature, humidity, wind speed, and the sampler’s signature. These records should accompany the samples when submitted to the laboratory.

Appendix B

(Normative Appendix)

Test Method for Various Parameters in Indoor Air

Contaminant Testing Methods

(1) Sulfur dioxide (SO₂): Formaldehyde absorption – Pararosaniline hydrochloride spectrophotometry (GB/T 16128-1995)

(2) Nitrogen dioxide (NOâ‚‚): Modified Saltzman method (GB/T 12372-90, GB/T 15435-1995)

(3) Carbon monoxide (CO): Non-dispersive infrared method (GB 9801-88, GB/T 18204.23-2000)

(4) Carbon dioxide (COâ‚‚): Infrared gas analysis (GB/T 18204.24-2000)

(5) Ammonia (NH₃): Indophenol blue spectrophotometry, Nessler reagent spectrophotometry, ion selective electrode method (GB/T 14669-93, GB/T 14679-93, GB/T 18204.25-2000)

(6) Ozone (O₃): UV spectrophotometry (GB/T 15438-1995, GB/T 18204.27-2000)

(7) Formaldehyde (HCHO): AHMT spectrophotometry, phenol reagent spectrophotometry, acetylacetone spectrophotometry (GB/T 15516-95, GB/T 16129-95, GB/T 18204.26-2000)

(8) Benzene (C₆H₆): Gas chromatography (GB 11737-89, Appendix C)

(9) Toluene (C₇H₈), Xylene (C₈H₁₀): Gas chromatography (GB 14677-93)

(10) Benzo[a]pyrene (B(a)P): High-performance liquid chromatography (GB/T 15439-1995)

(11) Respirable particles (PM10): Impact-type weighing method (GB/T 17095-1997)

(12) Total volatile organic compounds (TVOC): Gas chromatography (Appendix D)

(13) Bacterial count: Impact method (Appendix E)

(14) Thermal environment parameters: Temperature, humidity, and air velocity (Appendix F)

(15) Fresh air volume: Tracer gas method (GB/T 18204.18-2000)

(16) Radon (Rn): Scintillation vial method (GB/T 16147-1995, GB/T 14582-93)

* Note: Method (1) is the arbitration method.

Steel Wire Spiral Hydraulic Hose

High pressure and pulse resistance and long service life, Letone steel wire spiral Hydraulic Hose fully meets the needs of high-end hose users such as heavy machinery and equipment manufacturers. Letone hydraulic hose is guaranteed for use in the construcion, mining, agriculture, oil & gas and other industries with high performance.

Steel Wire Spiral Hydraulic Hose,Rubber Hose,Spiral Hose,Steel Wire Hose

Luohe Letone Hydraulic Technology Co., Ltd , https://www.litonghose.com