GB/T 17729-2023 English PDF (GBT17729-2023)

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GB/T 17729-2023: Hygienic standard and detect methods for the air quality inside interurban bus
GB/T 17729-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 03.220.20; 13.040.99
CCS T 09
Replacing GB/T 17729-2009, GB/T 28370-2012
Hygienic Standard and Detect Methods for the Air Quality
Inside Interurban Bus
ISSUED ON: MARCH 17, 2023
IMPLEMENTED ON: OCTOBER 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Limits of Volatile Organic Compounds and Carbonyl Compound in New Interurban
Bus ... 6
5 Limits of Main Components of the Air in In-service Interurban Bus ... 7
6 Detection Methods for Air Quality in Interurban Bus ... 7
Bibliography ... 15
Hygienic Standard and Detect Methods for the Air Quality
Inside Interurban Bus
1 Scope
This document specifies the limits and detection methods for volatile organic compounds and
carbonyl compound in new interurban buses, and the limits and detection methods for the main
components of the air in in-service interurban buses.
This document is applicable to Class B and Class III buses in Category-M2, Category-M3. Other
types of buses may take this as a reference.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB 7258 Technical Specifications for Safety of Power-driven Vehicles Operating on Roads
GB/T 15089 Classification of Powder-driven Vehicles and Trailers
HJ/T 400-2007 Determination of Volatile Organic Compounds and Carbonyl Compounds in
Cabin of Vehicles
3 Terms and Definitions
What is defined in GB 7258 and GB/T 15089, as well as the following terms and definitions
are applicable to this document.
3.1 interurban bus
Interurban bus refers to a bus designed and manufactured for transporting passengers between
cities (urban and rural areas) and specialized in passenger transport.
[source: GB 7258-2017, 3.2.1.3.1.1, modified]
3.2 new interurban bus
New interurban bus refers to a newly produced interurban bus whose off-line time is within (42
 5) d and whose interior has not been changed.
3.3 in-service interurban bus
In-service interurban bus refers to an interurban bus that has completed registration and is used
for commercial road passenger transport.
3.4 volatile organic compounds
Volatile organic compounds are a generic term for volatile compounds collected by absorbents
like Tenex and separated by a gas chromatographic column with a polarity index less than 10,
and whose retention time is between n-hexane and n-hexadecane.
[source: HJ/T 400-2007, 3.2, modified]
3.5 carbonyl compound
Carbonyl compound refers to a compound with carbonyl functional groups, collected by 2,4-
dinitrophenylhydrazine (DNPH) and analyzed by high performance liquid chromatography.
[source: ISO 12219-1:2021, 3.4]
3.6 total volatile organic compounds; TVOC
Total volatile organic compounds refer to the sum of the values of volatile organic compounds
collected by absorbents like Tenax and separated by a gas chromatographic column with a
polarity index less than 10, and whose retention time is between n-hexane and n-hexadecane.
[source: GB/T 18883-2022, 3.4, modified]
3.7 aerobic plate count
Aerobic plate count refers to the number of microorganisms per cubic meter of vehicle interior
space after the air in the vehicle is sampled by an air microbial sampler and cultured under
certain conditions (such as: culture medium, temperature and time, etc.).
NOTE: colony count is expressed in colony-forming units (CFU).
[source: GB 4789.2-2022, 2.1, modified]
4 Limits of Volatile Organic Compounds and Carbonyl
Compound in New Interurban Bus
Table 1 specifies the limits of volatile organic compounds, carbonyl compound and total volatile
organic compounds (TVOC) in new interurban bus.
domestic vehicles. Under special circumstances, the test time may be determined in accordance
with the time of arrival in the Chinese market.
6.1.2 Sampling environment
The sampling environment where the vehicle under inspection is located shall satisfy the
following conditions.
a) Ambient temperature: 25.0 C  1.0 C.
b) Relative humidity: (50  10) %.
c) Airflow velocity is not greater than 0.3 m/s.
d) Background concentration in the sampling environment chamber: for a single type of
volatile organic compound and carbonyl compound, not greater than 0.02 mg/m3; for
total volatile organic compounds (TVOC), not greater than 0.2 mg/m3.
6.1.3 Setting of sampling points
The number of sampling points in the vehicle is determined by the effective volume of the
passenger compartment of the vehicle under inspection and the specific conditions of the
vehicle under inspection and shall be able to correctly reflect the air quality in the vehicle. The
setting of sampling points shall satisfy the following requirements:
a) For vehicles with a length of 9 m and below, there shall be at least two measurement
points, which are evenly arranged along the longitudinal centerline of the
compartment;
b) For vehicles with a length of above 9 m, there shall be at least three measurement
points, which are evenly arranged along the longitudinal centerline of the
compartment;
c) The height of the sampling points is 1.2 m  0.1 m from the plane height of the interior
floor.
6.1.4 Sampling devices
6.1.4.1 Sampling environment chamber
6.1.4.1.1 The sampling environment chamber is mainly composed of main chamber, air
conditioning system and filtration system, etc.
6.1.4.1.2 The inner surface of the sampling environment chamber shall be made of low-release,
low-permeability and low-absorption materials. Materials and facilities that may affect the
background concentration of environmental pollutants shall not be placed in the chamber. The
space in the chamber shall be sufficient to accommodate the vehicle under inspection, so as to
facilitate the personnel in the testing and sampling of the vehicle under inspection.
6.1.4.1.3 The sampling environment chamber shall take technical measures to reduce the
influence of airflow on the air exchange inside and outside the compartment of the vehicle
under inspection.
6.1.4.1.4 The main chamber shall be provided with a main door and an auxiliary door. The main
door shall ensure the normal entry and exit of the vehicle under inspection and shall not be
opened during the entire sampling process; the auxiliary door is provided for the safe entry and
exit of personnel. When the auxiliary door is opened throughout the sampling process, it shall
be ensured that the sampling environment conditions at least within a space of 0.5 m from the
outer surface of the vehicle under inspection satisfy the requirements of 6.1.2.
6.1.4.2 Sample collection device
6.1.4.2.1 The sample collection device is mainly composed of constant-flow gas sampler,
sampling conduit and packed column sampling tube, etc.
6.1.4.2.2 The flow rate of the constant-flow gas sampler shall be adjustable and stable within
the range of 50 mL/min ~ 1,000 mL/min. After connecting with the packed column sampling
tube, adjust the gas flow rate an...