GB/T 31106-2014 English PDF (GBT31106-2014)

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GB/T 31106-2014: Determination of volatile organic compounds in furniture
GB/T 31106-2014
Determination of volatile organic compounds in furniture
ICS 97.140
Y80
National Standards of People's Republic of China
Determination of volatile organic compounds furniture
Published 2014-09-03
2015-08-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China issued
Table of Contents
Preface Ⅰ
1 Scope 1
2 Normative References 1
Terms and definitions 1 3
Formaldehyde Assay 1 4
5 Determination of benzene and total volatile organic compounds 6
The safe sampling Annex A (normative) Volume 12 of BTEX
Annex B (normative) typical GC-MS total ion chromatogram 13 BTEX and volatile organic compounds
Reference 14
Foreword
This standard was drafted in accordance with rules GB/T 1.1-2009 given.
Please note that some of the content of this document may involve patents. The issuing authority of this document does not assume responsibility to identify these patents.
The standard proposed by China Light Industry Federation.
This standard by the National Standardization Technical Committee furniture (SAC/TC480).
Drafting of this standard. Shenzhen Metrology and Quality Inspection Institute, Shanghai Institute of Quality Supervision, Inspection and technology, and national furniture
Indoor Environmental Quality Supervision and Inspection Center, Zhejiang Institute of furniture hardware, furniture National Product Quality Supervision and Inspection Center (Chengdu), Jiangsu
Provincial Quality Supervision and Inspection Institute, Shenzhen Huayuan Xuan Furniture Co., Ltd., Hunan Star Development Limited Hong Kong home.
Participated in the drafting of this standard. Man Wah Furniture Manufacturing (Shenzhen) Co., Ltd., Tsinghua University.
The main drafters. Wu Haitao, Zhang Shuyan, Li Weiheng, A Trial Guo Hongzhi, Xiao Zheng, Zhang Xiaobo, Luo Xin, Liang Mega, Li Long Ping,
Zhu Yuhong, Liu Yunzheng, Chen Bihuang, Huang Wei, Zhang Yinping, Hu Jie.
Determination of volatile organic compounds furniture
1 Scope
This standard specifies the test methods of volatile organic compounds released furniture.
This standard applies to the furniture formaldehyde, benzene, measured emission of total volatile organic compounds.
2 Normative references
The following documents for the application of this document is essential. For dated references, only applies to the version dated paper
Pieces. For undated references, the latest edition (including any amendments) applies to this document.
Preparation GB/T 601 standard titration solution Chemicals
GB/T 603 Test Methods Chemicals The Preparations used
GB/T 6682 Water for analytical laboratory specifications and test methods
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
Volatile organic compounds volatileorganiccompounds (VOC)
Released from the sample and can be detected at the outlet of the gas testing apparatus of organic compounds.
Note. the outlet means of the test device testing apparatus outlet VOC emission furniture, including sampling the gas sample designed to acquire
mouth. For example. in a chamber test method furniture when emission of volatile organic compounds, the test device outlet vent means in a chamber, or climate compartment
Sampling ports.
3.2
Total volatile organic compounds totalvolatileorganiccompounds (TVOC)
TenaxTA using TenaxGC or sampling, a non-polar column (polarity index of less than 10) was analyzed, the retention time in n-hexane
Between the volatile organic compounds and n-hexadecane.
3.3
Standard state normalstate
Temperature of 273K, dry state when the pressure is 101.325kPa.
4 Determination of formaldehyde
4.1 Method One. phenol reagent spectrophotometry
4.1.1 Principle
Air formaldehyde generating reagent and a phenol triazine, oxazine cyan compound is formed in an acidic solution of ferric ions oxidation. According to Yan
Color depth, colorimetric quantification.
4.1.2 Reagents
Unless otherwise specified, the purity of the reagents to be analytically pure and above, the standard titration solution, and products with the formulation used, should be
GB/T 601, a predetermined preparation GB/T 603, and should meet the laboratory water GB/T 6682 specifications in the three water.
4.1.2.1 absorbing liquid stock. Weigh 0.10g phenol reagent [C6H4SN (CH3) C. NNH2 · HCl, referred to as the MBTH], dissolved in water, set
In 100mL volumetric flask, add water to the scale, shake. Save the fridge, stable 3d.
4.1.2.2 absorbing solution. amount of liquid absorption liquid 5mL, 95mL of water was added, i.e. the absorption liquid. When sampling, temporary use existing service.
4.1.2.3 0.1mol/L hydrochloric acid solution. 9mL amount of hydrochloric acid, dissolved in water and diluted to 1000mL.
4.1.2.4 1% ammonium ferric sulfate solution. Weigh 1.0g of ammonium ferric sulfate [NH4Fe (SO4) 2 · 12H2O], dissolved in 0.1mol/L hydrochloric acid, and
Diluted to 100mL.
4.1.2.5 iodine solution [c (12I2
) = 0.1mol/L]. Weigh 40g of potassium iodide, dissolved in 25mL of water, 12.7g of iodine was added. Be iodine End
After full dissolution, with water to 1000mL. Into a brown bottle and stored in the dark.
4.1.2.6 1mol/L sodium hydroxide solution. Weigh 40g of sodium hydroxide, dissolved in water and diluted to 1000mL.
4.1.2.7 0.5mol/L sulfuric acid solution. Take 28mL of concentrated sulfuric acid was slowly added to the water and, after cooling, diluted to 1000mL.
4.1.2.8 sodium thiosulfate standard titration solution [c (Na2S2O3) = 0.1000mol/L]. standard reagents can be purchased, in accordance with GB/T 601
Regulations formulated and calibrated.
4.1.2.9 0.5% starch solution. 0.5g of soluble starch, after a small amount of water into a paste, then add 100mL boiling, and boiled
2min ~ 3min to the solution became clear. After cooling, 0.1g 0.4g salicylic acid or zinc chloride, to save.
4.1.2.10 Formaldehyde standard stock solution. Take 2.8mL content of 36 to 38% formaldehyde solution, into 1000mL volumetric flask, add water
Diluted to the mark, this is equivalent to about 1mg formaldehyde solution 1mL, which exact concentration of calibration by the following iodometry. Also available for purchase standard
Reagents.
Calibration Formaldehyde standard stock solution. accurately weighed 20.00mL be calibrated formaldehyde standard stock solution, the bottle was placed 250mL iodometric
in. Iodine solution was added 20.00mL (4.1.2.5) and 15mL of sodium hydroxide solution (4.1.2.6), placed 15min, 20mL sulfuric acid solution was added
Liquid (4.1.2.7), then place 15min. When standard titration with sodium thiosulfate solution (4.1.2.8) titration until the solution appeared yellow, was added
1mL starch solution (4.1.2.9), and continue the titration end point to just blue fade, record the volume of sodium thiosulfate solution titrated with standard
(V2). While water as a reagent blank titration, the recording volume (V1) of the blank titration standard sodium thiosulfate titration solution used. Formaldehyde solution
In concentrations of formula (1).
ω = (V1-V2) × c ×
15.02
20.00
(1)
Where.
[omega] --- Formaldehyde standard stock solution formaldehyde concentration in milligrams per milliliter (mg/mL);
When V1 --- titration for blank titration volume of sodium thiosulfate standard solution used, in milliliters (mL);
--- V2 formaldehyde titration volume of sodium thiosulfate standard solution was titrated with a solution, in milliliters (mL);
C --- The exact value of the concentration of the standard sodium thiosulfate titration solution in units of moles per liter (mol/L);
15.02 --- Formaldehyde molar mass values of [M (
2HCHO
) = 15.02], in units of grams per mole (g/mol);
The volume 20.00 --- Formaldehyde standard stock solution taken in milliliters (mL).
Two parallel titration volume error, titration with sodium thiosulfate standard titration solution should be less than 0.05mL, or should be re-calibrated.
4.1.2.11 Formaldehyde standard solution. When you use the formaldehyde standard stock solution was diluted with absorption liquid (4.1.2.2) into 1.00mL containing 1μg A
aldehyde. This standard solution is stable for 24h.
4.1.3 instruments and equipment
4.1.3.1 Large bubble absorbent tube. YES 10mL mark.
4.1.3.2 air sampler. flow range 0L/min ~ 2L/min. Adjustable flow stability, lather flowmeter applied before sampling and after sampling
Sampling flow calibration error is less than 5%.
4.1.3.3 stoppered cuvette. 10mL.
4.1.3.4 Atmospheric Pressure gauge. accuracy 0.01kPa.
4.1.3.5 spectrophotometer.
4.1.3.6 General commonly used laboratory equipment.
4.1.4 Sampling
Absorption liquid with a large bubble built 10mL (4.1.2.2) absorber tubes (4.1.3.1), at 0.5L/min ~ 1.0L/min flow rate,
When the exit gas from the test device sampling, sample volume depending on the concentration of formaldehyde in the gas to be measured, generally not less than 10L, sampling should
To ensure that the sample flow is not greater than 80% of the gas flow device outlet. Temperature and atmospheric pressure recorded sample points. After sampling the samples at room temperature
It should be analyzed in the next 24h.
4.1.5 Analysis of step
Draw standard curve 4.1.5.1
Of 10mL stoppered cuvette, with formaldehyde standard solution as shown in Table 1 prepared in standard series.
Table 1 Formaldehyde Standard Series
Tube No. 012345678
Standard solution volume/mL 0 0.10 0.20 0.40 0.60 0.80 1.00 1.50 2.00
Absorbing liquid volume/mL 5.00 4.90 4.80 4.60 4.40 4.20 4.00 3.50 3.00
Formaldehyde content/μg 0 0.10 0.20 0.40 0.60 0.80 1.00 1.50 2.00
A 1% solution of ammonium iron sulfate was added 0.4mL each tube, shaken. 15min placed in an environment of not below 18 ℃. With more than 1cm
Cuvette, at a wavelength of 630nm, using water as a reference to determine the absorbance of each tube solution. Formaldehyde content as the abscissa, the ordinate is the absorbance
Standard, standard curve, and calculating the slope of the regression curve, the slope factor calculated as the reciprocal of the measured sample Bg.
4.1.5.2 Determination of Samples
After sampling, rinsed with a small amount of absorption liquid absorbent tube, and the combined total volume of 10mL, 5.00mL sample solution was pipetted into a colorimetric tube.
According to procedures standard curve (4.1.5.1) measured absorbance (A), if the measured absorbance value exceeds the linear range of the standard curve
Wai, pipetting the sample solution again, be diluted, the dilution factor recording (D); while each batch of samples measured with 5.00mL unsampled
Absorbing liquid as a reagent blank measurement reagent blank absorbance (A0).
4.1.6 calculation results
4.1.6.1 The sample volume by the formula (2) in terms of the volume of the sample in the standard state.
--- sample volume V0 in terms of the standard state, in liters (L);
V --- sample volume in liters (L);
Absolute temperature T0 --- standard state, 273K;
Field sampling points when the sampling Celsius --- T (t) and the absolute temperature of the reference state and, (t 273) K;
Sampling locations atmospheric pressure sampling p ---, kilopascals (kPa);
--- atmospheric pressure P0 at a standard state, 101.3kPa.
4.1.6.2 formaldehyde concentration in the gas sample according to equation (3) is calculated.
Sample C --- formaldehyde gas concentration, in milligrams per cubic meter (mg/m3);
A --- The absorbance of the sample solution;
A0 --- absorbance of the blank solution;
--- BG standard curve obtained by plotting (4.1.5.1) factor calculated in micrograms ([mu] g);
D --- dilution factor;
--- sample volume V0 in terms of the standard state, in liters (L).
The results rounded to two significant figures.
4.1.7 measurement range, and to exclude interfering
4.1.7.1 Measuring range
With 5mL of sample solution, applied to the determination of the range of 0.1μg ~ 1.5μg; sample volume is 20L, the measurable concentration range
0.01mg/m3 ~ 0.15mg/m3.
4.1.7.2 interference and exclusion
Phenol 20μg, 2μg dichloride, aldehydes and nitrogen did not interfere with this law. When the coexistence of sulfur dioxide, so that the measurement result is low. Therefore dioxide
Sulfur interference can not be ignored, can be first gas sample through filter paper manganese sulfate, be excluded.
4.1.8 Precision
4.1.8.1 Repeatability
The absolute difference between two independent test results obtained under repeatability conditions less than 20% of the arithmetic mean of the two measured values,
Greater than 20% of these two measured values the arithmetic mean is more than 5% without the premise.
Reproducibility 4.1.8.2
The absolute difference between two independent test results obtained in the reproduction conditions is not more than 40% of the arithmetic mean of the two measured values,
Greater than 40% of these two measured values the arithmetic mean is more than 5% without the premise.
4.2 Method II. Spectrophotometric chromotropic acid
4.2.1 Principle
Purple formaldehyde with chromotropic acid compound in sulfuric acid solution, is proportional to the density of its color and formaldehyde content, quantitative comparison with the standard.
4.2.2 Reagents
Unless otherwise specified, the purity of the reagents to be analytically pure and above, the standard titration solution, and products with the formulation used, should be
GB/T 601, a predetermined preparation GB/T 603, and should meet the laboratory water GB/T 6682 specifications in the three water.
4.2.2.1 absorbing solution. Weigh 10.0g of sodium bisulfite, in a beaker, dissolved in water, placed in a brown 1000mL volumetric flask, add water to
Mark, stored in the dark.
4.2.2.2 1% chromotropic acid (C10H8O8S2) solution. Weigh 0.1g of chromotropic acid, placed in a conical flask, add water, 10mL, shake to dissolve completely (Pro existing service).
4.2.2.4 1mol/L sodium hydroxide solution. Same as 4.1.2.6.
4.2.2.5 sulfuric acid (H2SO4). concentrated sulfuric acid.
4.2.2.6 0.5mol/L sulfuric acid solution. Same as 4.1.2.7.
4.2.2.7 sodium thiosulfate standard titration solution [c (Na2S2O3) = 0.1000mol/L]. the same 4.1.2.8.
4.2.2.8 0.5% starch solution. Same as 4.1.2.9.
4.2....