GB/T 31106-2014 PDF English
Search result: GB/T 31106-2014 English: PDF (GB/T31106-2014)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB/T 31106-2014 | English | 130 |
Add to Cart
|
0-9 seconds. Auto-delivery.
|
Determination of volatile organic compounds in furniture
| Valid |
PDF Preview: GB/T 31106-2014
GB/T 31106-2014: PDF in English (GBT 31106-2014) GB/T 31106-2014
GB
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 97.140
Y 80
Determination of volatile organic compounds in furniture
ISSUED ON. SEPTEMBER 03, 2014
IMPLEMENTED ON. AUGUST 01, 2015
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the PRC.
Table of contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Determination of formaldehyde ... 5
5 Determination of benzene and total volatile organic compounds ... 14
Appendix A (Normative) Safe sampling volume of benzene series ... 23
Appendix B (Informative) Typical GC-MS total ion chromatogram of benzene
series and volatile organic compounds ... 24
References ... 25
Foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
Please note that some of the contents of this document may involve patents.
The issuer of this document does not assume responsibility for the
identification of these patents.
This standard was proposed by the China Light Industry Federation.
This standard shall be under the jurisdiction of the National Furniture
Standardization Technical Committee (SAC/TC 480).
The main drafting organizations of this standard. Shenzhen Metrology and
Quality Inspection Institute, Shanghai Quality Supervision and Inspection
Technology Research Institute, State Furniture and Indoor Environment Quality
Supervision and Inspection Center, Zhejiang Furniture and Hardware
Research Institute, National Furniture Product Quality Supervision and
Inspection Center (Chengdu), Jiangsu Product Quality Supervision and
Inspection Research Institute, Shenzhen Huayuanxuan Furniture Co., Ltd.,
Hunan Xinggang Home Furnishing Development Co., Ltd.
The participating drafting organizations of this standard. Minhua Furniture
Manufacturing (Shenzhen) Co., Ltd., Tsinghua University.
The main drafters of this standard. Wu Haitao, Zhang Shuyan, Li Weiheng,
Zhang Xiaojie, Guo Hongzhi, Xiao Zheng, Zhang Xiaobo, Luo Xin, Liang Mijia,
Li Longping, Zhu Yuhong, Liu Yunzheng, Chen Bihuang, Huang Xiaowei,
Zhang Yinping, Hu Jie.
Determination of volatile organic compounds in furniture
1 Scope
This standard specifies the test methods for the volatile organic compounds in
furniture.
This standard applies to the determination of formaldehyde, benzene and total
volatile organic compounds in furniture.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this Standard.
GB/T 601 Chemical reagent - Preparations of standard volumetric solutions
GB/T 603 Chemical reagent - Preparations of reagent solution for use in test
GB/T 6682 Water for analytical laboratory use - Specification and test
methods
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Volatile organic compounds (VOC)
It refers to the organic compound released from the sample AND capable of
being detected in the outlet gas of the test equipment.
Note. The outlet of the test equipment refers to the gas outlet of the
equipment that tests the release of volatile organic compounds from
furniture, including sampling ports designed to collect gas samples. For
example, when using the climate chamber method to test the volatile
organic compound release from furniture, the outlet of the test equipment
refers to the exhaust port of the climate chamber OR the sampling port of
the climate chamber.
4.1.2.3 0.1 mol/L hydrochloric acid solution. MEASURE 9 mL of hydrochloric
acid; DISSOLVE it in water; DILUTE it to 1000 mL.
4.1.2.4 1% ammonium ferric sulfate solution. WEIGH 1.0 g of ammonium ferric
sulfate [NH4Fe (SO4)2•12H2O]; USE 0.1 mol/L hydrochloric acid to dissolve it;
DILUTE it to 100 mL.
4.1.2.5 Iodine solution [c (½I2) = 0.1 mol/L]. WEIGH 40 g of potassium iodide,
DISSOLVE it into 25 mL of water; ADD 12.7 g of iodine. After the iodine is
completely dissolved, USE water to make its volume reach to 1000 mL;
TRANSFER it into a brown bottle; STORE it in the dark.
4.1.2.6 1 mol/L sodium hydroxide solution. WEIGH 40 g of sodium hydroxide;
DISSOLVE it into water; and DILUTE it to 1000 mL.
4.1.2.7 0.5 mol/L sulfuric acid solution. TAKE 28 mL of concentrated sulfuric
acid; slowly ADD it into water; after cooling, DILUTE it to 1000 mL.
4.1.2.8 Sodium thiosulfate standard titration solution [c(Na2S2O3) = 0.1000
mol/L]. It may purchase standard reagent OR otherwise conduct preparation
and calibration in accordance with the provisions of GB/T 601.
4.1.2.9 0.5% starch solution. USE a small amount of water to make 0.5 g of
soluble starch into a paste; ADD 100 mL of boiling water; BOIL it 2 min ~ 3 min
until the solution is transparent; after cooling, ADD 0.1 g of salicylic acid or 0.4
g of zinc chloride; PRESERVE it.
4.1.2.10 Formaldehyde standard stock solution. TAKE 2.8 mL of 36% ~ 38%
formaldehyde solution; PLACE it into a 1000 mL volumetric flask; ADD water to
dilute it to the mark; SHAKE it uniformly; at this time, 1 mL of this solution
equals to 1 mg of formaldehyde; AND its exact concentration is calibrated
using the following iodometric method. It may also purchase standard reagent.
Calibration of formaldehyde standard stock solution. Accurately MEASURE
20.00 mL of formaldehyde standard stock solution to be calibrated; PLACE it in
a 250 mL iodine volumetric flask. ADD 20.00 mL of iodine solution (4.1.2.5)
and 15 mL of sodium hydroxide solution (4.1.2.6); LET it standing for 15 min;
ADD 20 mL of sulfuric acid solution (4.1.2.7); LET it standing for 15 min again.
USE the sodium thiosulfate standard titration solution (4.1.2.8) to titrate it, until
the solution shows pale yellow; ADD 1mL of starch solution (4.1.2.9);
CONTINUE titration until the blue color disappears; RECORD the volume of
the sodium thiosulfate standard titration solution volume (V2) used. At the
same time, USE water to do reagent blank titration; RECORD the volume of
the sodium thiosulfate standard titration solution volume (V2) used for blank
Bg - Calculation factor obtained from the drawn standard curve (4.1.5.1), in
micrograms (μg);
d - Dilution factor;
V0 - Sampling volume after converted into the standard state, in liters (L).
The calculation result is retained with two significant digits.
4.1.7 Measurement range, interference and exclusion
4.1.7.1 Measuring range
USE 5 mL of sample solution, AND the determination range of this method is
0.1 μg ~ 1.5 μg; if the sampling volume is 20 L, the determinable concentration
range is 0.01 mg/m3 ~ 0.15 mg/m3.
4.1.7.2 Interference and exclusion
The 20 μg phenol, 2 μg aldehyde and nitrogen dichloride have no interference
with this method. The co-existence of the sulfur dioxide will make the
determination result slightly low. Therefore, the interference from sulfur dioxide
shall not be ignored; AND it may make the gas sample firstly pass through the
manganese sulfate filter paper to remove the sulfur dioxide.
4.1.8 Precision
4.1.8.1 Repeatability
The absolute difference between the two independent test results obtained
under the repeatability condition is not more than 20% of the arithmetic mean
of the two determined values, based on the preconditions that the cases
exceeding 20% of the arithmetic mean of the two determined values do not
exceed 5%.
4.1.8.2 Reproducibility
The absolute difference between the two independent test results obtained
under the reproducibility condition is not more than 40% of the arithmetic mean
of the two measured values, based on the preconditions that the cases
exceeding 40% of the arithmetic mean of the two determined values do not
exceed 5%.
4.2 Method 2. chromotropic acid spectrophotometry
4.2.1 Principle
5.2.1.1 Standard gas
PREPARE the mixed standard gas containing each compound gas component
to be determined at concentration about 100 μg/m3. It may also purchase the
certified mixed standard gas.
5.2.1.2 Liquid standard substances
Each solvent to be tested is chromatographic pure which is not affected by the
compound that co-eluting with the compound to be tested.
5.2.1.3 Calibration of mixed solution
USE the liquid standard substance of 5.2.1.2 to prepare it; USE the methanol
solution as the dilution solvent. It may also purchase the certified mixed
standard gas.
5.2.1.3.1 A solution containing about 10 mg/mL of each liquid standard
substance
ADD 50 mL of methanol solution into a 100 mL volumetric flask; accurately
WEIGH 1 g (accurate to 0.001 g) of liquid standard substance into this
volumetric flask; it may weigh and place several liquid standard substances
into the same volumetric flask, AND start weighing from the liquid standard
substance of the weakest volatility. USE the methanol solution to make the
volume reach to the mark; SHAKE it uniformly. This standard solution is sealed
and preserved in a 4 °C refrigerator AND ...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
|