GB/T 26393-2011 English PDF (GBT26393-2011)

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GB/T 26393-2011: Test methods for harmful matter of burnable incense
GB/T 26393-2011
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.120
Y 40
Test methods for harmful matter of burnable incense
ISSUED ON: MAY 12, 2011
IMPLEMENTED ON: SEPTEMBER 15, 2011
Issued by: General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Reagents and materials ... 4 
4 Instruments ... 5 
5 Test of migration ... 5 
6 Test of the concentration of formaldehyde, benzene, toluene and xylene after
combustion ... 7 
7 Test of total volatile organic compound (TVOC) concentration after
combustion ... 8 
Appendix A (Normative) Standard solution concentration ... 9 
Test methods for harmful matter of burnable incense
1 Scope
This Standard specifies test methods for the content of migration in burnable
incense and the concentration of formaldehyde, benzene, toluene, xylene, and
total volatile organic compounds after combustion.
This Standard applies to the determination of harmful matter of solid incense
used in public places such as religious, etiquette, sacrificial, and other indoor
and outdoor environments.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments)
applies.
GB/T 6682-2008, Water for analytical laboratory use - Specification and test
methods
GB/T 11737-1989, Standard method for examination of benzene toluene and
xylene in air of residential areas - Gas chromatography
GB/T 15516-1995, Air quality - Determination of formaldehyde -
Acetylacetone spectrophotometric method
GB 50325-2001, Code for indoor environmental pollution control of civil
building engineering
3 Reagents and materials
3.1 Water: Grade-3 water which is specified in GB/T 6682-2008.
3.2 Hydrochloric acid: analytical reagent, 36.0% ~ 38.0%.
3.3 0.07 mol/L hydrochloric acid solution: absorb 5.8 mL of hydrochloric acid;
use water to dilute to 1 000 mL.
3.4 2 mol/L hydrochloric acid solution: absorb 16.6 mL of hydrochloric acid; use
water to dilute to 100 mL.
Use a pulverizer to crush 20 g of sample (for the bamboo incense, remove the
bamboo core first); then, pass it through a 0.180 mm (80 mesh/inch) standard
sieve; mix well; divide the prepared sample into two equal parts, one for the
sample, another one to be tested.
5.1.2 Extraction of sample
Weigh 2 g of sample into a 250 mL Erlenmeyer flask with stopper; put 0.07
mol/L hydrochloric acid solution in a constant temperature water bath oscillator
to preheat to 37 °C; transfer 100 mL into the above-mentioned Erlenmeyer flask
with stopper; shake for 1 min; use 2 mol/L hydrochloric acid solution to adjust
the pH to 1.0 ~ 1.5. Shake in the constant temperature water bath oscillator at
37 °C for 1 h under dark conditions; then, stand still in a water bath at 37 °C for
1 h. Take the supernatant and filter for testing. If necessary, centrifugal
separation can be performed at a speed of 2 000 r/min. The separation shall be
completed as soon as possible after the above-mentioned storage time, and
the time of centrifugation shall not exceed 10 min. The extracted filtrate must
be analyzed and tested within 1 working day. At the same time, prepare a blank
sample according to the same procedure.
5.2 Test of sample solution
Use an inductively coupled plasma emission spectrometer to test each
standard solution in turn from low concentration to high concentration; draw the
concentration-absorbance standard curve. Test the absorbance of the sample
solution and the blank sample solution; read the corresponding migration
concentration from the standard curve.
5.3 Calculation
After testing the concentration of the migration in the sample solution and the
blank sample solution, calculate the content of the migration in the sample
according to Formula (1).
Where:
X – the content of migration in the sample, in milligrams per kilogram (mg/kg);
c1 – the concentration of migration in the sample solution read from the standard
curve, in milligrams per liter (mg/L);
c0 – the concentration of migration in the blank solution read from the standard
curve, in milligrams per liter (mg/L);
V – the volume of the sample solution, in milliliters (mL), which is 100 according
to this method;
m – sample mass, in grams (g).
5.4 Result processing
The absolute difference between the two parallel test results is not more than
10% of the arithmetic mean of the two measured values, otherwise, it needs to
be sampled and tested again. Take the average of the two parallel test results.
6 Test of the concentration of formaldehyde, benzene,
toluene and xylene after combustion
6.1 Test conditions
Set a sample point in a closed room of (45±2) m3; the center of location in the
room is shown in Figure 1a). The sampling point shall be kept away from vents,
and the distance from the wall shall be greater than 0.5 m. The height of the
sampling point, in principle, shall be consistent with the height of the human
breathing belt; the relative height shall be at 0.5 m ~ 1.5 m.
6.2 Test method
Connect the atmospheric sampler to the porous glass absorption tube and the
activated carbon sampling tube; place and evenly distribute them on the
diagonal of the room, as shown in Figure 1a); ignite the incense whose mass is
(0.6±0.020) g (the mass of bamboo incense is calculated according to the mass
after removing the bamboo core); start sampling after the sample is ignited;
close the doors and windows during sampling. Perform sampling for 45 minutes
at a flow rate of 0.5 L/min. For the collected gas, test the concentration of
formaldehyde after combustion according to the method of GB/T 15516-1995;
test the concentration of benzene, toluene, and xylene after combustion
according to the method of GB/T 11737-1989 method. Take the average of the
test results of the three sampling points. Before each sampling, take a blank
sample for analysis in the same way as the sample.