QB/T 2761-2006 English PDF (QBT2761-2006)

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QB/T 2761-2006: Methods for determination of purificatory effect of indoor environment decontamination product
QB/T 2761-2006
QB
LIGHT INDUSTRY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.35
Classification No.: Y44
Filing No.: 18383-2006
Method for determination of purificatory effect of indoor
environment decontamination product
ISSUED ON: AUGUST 19, 2006
IMPLEMENTED ON: DECEMBER 01, 2006
Issued by: National Development and Reform Commission
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Definitions ... 4 
4 Instruments and equipment ... 5 
5 Preparation of samples ... 6 
6 Test methods ... 6 
7 Sampling and analysis of sampling results ... 7 
8 Calculation of removal rate of pollutants by passive decontamination materials ... 8 
Appendix A (Normative) Structure and equipment of air test chamber ... 9 
Method for determination of purificatory effect of indoor
environment decontamination product
1 Scope
This standard specifies the test methods for the determination of purificatory effect of
indoor environment decontamination product.
This standard is applicable to the determination of pollutant removal efficiency of
various indoor air passive purification materials. The active purifier is carried out
according to GB/T 18801-2002 "Air cleaner".
The determination of microbially contaminated purification products shall be carried
out in accordance with the relevant standards of the Ministry of Health.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For the dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this Standard; however, parties who
reach an agreement based on this Standard are encouraged to study if the latest versions
of these documents are applicable. For undated references, the latest edition of the
referenced document applies.
GB/T 18883-2002 Indoor air quality standard
GB/T 16129-1995 Standard method for hygienic examination of formaldehyde in
air of residential areas - Spectrophotometric method
GB/T 18204.26-2000 Methods for determination of formaldehyde in air of public
places
GB/T 11737-1989 Standard method for examination of benzene toluene and xylene
in air of residential areas-Gas chromatography
GB/T 18801-2002 Air cleaner
3 Definitions
The following definitions apply to this standard.
4.4 Activated carbon sampling tube.
4.5 Spectrophotometer: It has a wavelength of 500 nm AND is equipped with a cuvette
which has a light path of 10 mm.
4.6 Gas chromatograph: It is equipped with hydrogen flame ionization detector.
4.7 Portable formaldehyde detector.
4.8 1.5m3 air test chamber: See Appendix A.
5 Preparation of samples
For the passive decontamination materials, prepare appropriate test samples according
to the product instructions. For products without product instructions, spray (coat) the
decontamination material three times, on three sheets of 1 m2 base paper (requires inert
material) (use a small spray pump to spray as fine mist as possible). After the first course
of spraying is finished and dry, spray the second cause. After the second course is dry,
spray the third course (the material consumption for brushing: 200 g; the material
consumption for spraying: 100 g).
6 Test methods
6.1 General conditions of test
Use two air test chambers (A is blank chamber, B is sample chamber), to test the
concentration of gaseous pollutants, which are removed by the decontamination product.
The test is carried out at normal temperature and normal pressure.
6.2 Requirements for test chamber
See Appendix A.
6.3 Pretreatment of test chamber
6.3.1 The air test chamber shall be clean, to purify the air quality in the chamber to the
maximum extent AND ensure that there are no pollutants.
6.3.2 Before the test, it shall make the release curve of the release source, for the two
cabins, respectively. The routine test shall be carried out, after they are basically parallel.
6.4 Preparation of release source
Roll 5 layers of 17 cm □ 40 cm [Translator: should be 17cm × 40cm] medical
degreased gauze, on two glass rods, which have a diameter of 5 mm and a length of 30
cm. Use cotton threads to fix it. Place them upright in a 500 mL reagent bottle. Load
200 mL of pollutants, which have a concentration of 0.2% formaldehyde, 1% ammonia,
0.06% benzene, 0.1% toluene, 0.4% xylene, respectively. TVOC is prepared according
to the specified proportions of benzene, toluene, xylene. All reagents are of analytical
grade. The container is labeled with A1 and B1. After the gauze is completely wet, it can
be put into use.
6.5 Experimental steps
6.5.1 Hang the untreated base paper in the blank test chamber A. Then hang the base
paper with the sprayed decontamination material in the test chamber B. OR place the
prototype of the purifier to be tested in the middle of the test chamber B.
6.5.2 Place the containers, which have the prepared pollutant release sources A1 and B1
in blank test chamber A and sample test chamber B, respectively. Close the doors
immediately.
6.5.3 Turn on the fans of the blank test chamber A and the sample test chamber B. Stir
for 1 min, to mix the air in the chamber with the pollutants released by the release source.
Turn off the fans, at the same time, to sample the air in the blank chamber. Measure the
concentration of pollutants in the air in the blank cabin, which is the initial
concentration, denoted as C0.
6.5.4 After 24 hours, sample the concentration of air pollutants in the two cabins.
Analyze and test, that is, the concentration values of cabins A and B within a certain
period of time, denoted as CA and CB.
7 Sampling and analysis of sampling results
7.1 Sampling method
Connect the air outlet to the sample inlet of the outside air sampler or the test instrument.
Collect the cabin air sample, through passing it through the absorption pipe, the
sampling pipe or the test instrument, at a certain flow rate. Sampling and analysis follow
the methods specified in GB/T 18883. When conditions permit, it is best to use an
automatic analytical instrument, to continuously measure the time-dependent changes
in the concentration of pollutants in the cabin. Analytical instruments shall meet the
technical requirements for indoor environmental testing AND shall be calibrated
regularly.
7.2 Sampling of absorbent liquid
According to the requirements of different pollutants, use a bubble absorption tube,
which contains 5 mL or 10 mL of absorbing liquid, to connect with the sampling tube
port on the test bulkhead. Take 10 L or 20 L of gas, respectively, at a flow rate of 0.5
L/min or 1.0 L/min. After the sampling is completed, immediately use a rubber cap to
seal the sampling nozzle of the test chamber. Record the temperature and atmospheric
Appendix A
(Normative)
Structure and equipment of air test chamber
A.1 Structure of the air test chamber
A.1.1 Air test chamber's volume
0.9 m x 0.9 m x 1.85 m = 15 m3
A.1.2 Framework
76 mm x 44 mm aluminum profile.
A.1.3 Walls
Use float glass, which has a thickness of 5 mm.
A.1.4 Flooring
Same as wall.
A.1.5 Roofing
Same as wall.
A.1.6 Sealing material and air tightness
The material of the test chamber shall be non-adsorbent and chemically inert (such as
glass or stainless steel). The inner surface of the test chamber shall be smooth. All
connections shall be sealed with air-tight materials (such as silicone rubber), to ensure
the leakage rate of the test chamber is less than 0.05 m3/h.
A.1.7 Fan
Choose a suitable adjustable low-speed fan, where the control switch is outside the
cabin.
A.1.8 Sampling holes
It is located on the cabin wall, at a height of 1.3 m above the floor. The sampling pipe
is a metal pipe, which connects the air inside and outside the cabin. The outer end of
the sampling pipe is sealed with a rubber cap.
A.2 Release source placement container