GB/T 39764-2021 PDF EnglishUS$175.00 · In stock · Download in 9 seconds
GB/T 39764-2021: Volatile organic compounds from upholstered furniture - On-site and rapid detection method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 39764-2021: Volatile organic compounds from upholstered furniture - On-site and rapid detection method---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT39764-2021 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 97.140 CCS Y 80 Volatile organic compounds from upholstered furniture - On-site and rapid detection method ISSUED ON: MARCH 09, 2021 IMPLEMENTED ON: OCTOBER 01, 2021 Issued by: State Administration for Market Regulation; Standardization Administration of the PRC. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Terms and definitions ... 4 4 Principle ... 5 5 Equipment ... 5 6 Reagents and materials ... 8 7 Test procedure ... 8 8 Test data ... 11 Volatile organic compounds from upholstered furniture - On-site and rapid detection method1 ScopeThis document specifies the terms and definitions, principle, equipment, reagents and materials, test procedure, and test data of the on-site and rapid detection method for volatile organic compounds from upholstered furniture. This document is applicable to on-site and rapid detection of volatile organic compounds from upholstered furniture such as sofas, mattresses, and soft beds with flat surfaces.2 Normative referencesThe contents of the following documents, through normative references in this text, constitute indispensable provisions of this document. Among them, for dated references, only the edition corresponding to that date applies to this document. For undated references, the latest edition (including all amendments) applies to this document. GB/T 18204.2-2014 Examination methods for public places - Part 2: Chemical pollutants GB/T 39763 Technical requirements for on-site and rapid collection equipment of volatile organic compounds from furniture3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Volatile organic compounds from upholstered furniture Volatile organic compounds released from the tested surface of upholstered furniture and tested by on-site and rapid detection method. 3.2 Background clean The background clean can be performed by either internal circulation (7.3.2) or nitrogen purging mode (7.3.3). 7.3.2 Internal circulation 7.3.2.1 Adjust the three-way valve (position 6 in Figure 1) to the upper passage position. 7.3.2.2 Set the flow rate of the gas pump (position 3 in Figure 1) to 600 mL/min. Set the running time to 30 min. 7.3.2.3 Start the gas pump (position 3 in Figure 1). The air in the entire device generates circulating power; so that the air in the collector, at a flow rate of 600 mL/min, passes through the mixing filter pipe (position 7 in Figure 1) and then returns to the collector. The volatile organic compounds in the ambient background air are absorbed by the mixing filter pipe (position 7 in Figure 1), to form clean air circulation to replace the air in the collector. 7.3.3 Nitrogen purging Connect the nitrogen source (position 13 in Figure 1) to the intake port (position 1 in Figure 1) on the left side of the mask body. Open the top exhaust port (position 2 in Figure 1) to exhaust nitrogen. Turn on the nitrogen source, to purge the air in the mark body at a flow rate of 1 L/min, for no less than 18 min; replace the air in the mask body with nitrogen. After purging, immediately turn off the nitrogen source and the top exhaust port. 7.4 Cyclic enrichment 7.4.1 After the background clean, adjust the three-way valve (position 6 in Figure 1) to the lower passage position. 7.4.2 Start the thermostat (position 9 in Figure 1) to control the heating temperature to (40±2)°C. Start the gas pump (position 3 in Figure 1). The temperature of the air entering at the entrance (position 10 in Figure 1) of the test mask body shall be (36±2)°C. When the air temperature at the entrance does not meet the requirement of (36±2)°C, the thermostat (position 9 in Figure 1) shall be adjusted. The VOCs released by the sample are enriched in the collector. The circulating gas flow is 600 mL/min. The enrichment time is 30 min. 7.5 Sampling and rapid VOCs analysis 7.5.1 General The total amount of gas analyzed in each sampling shall not be greater than 80% of the volume of the mask body. If the amount of gas collected for sampling analysis is greater than 10% of the volume of the mask body, when the test is continued, 7.4.2 cyclic enrichment shall be repeated before sampling. Under the condition of meeting the detection requirements, the collection parameters can be set according to the instructions for use of the instrument. 7.5.2 Rapid formaldehyde analysis After the end of the cyclic enrichment, within 30 s, turn on the gas circuit switch (position 5 in Figure 1); connect the rapid VOCs analyzer (position 15 in Figure 1) with the on-site and rapid collection equipment. Collect the gas in the mask body for analysis. The reading displayed on the rapid formaldehyde analyzer is the formaldehyde concentration value. The measured value of volume fraction shall, according to formula (15) in 7.4.4.1 of GB/T 18204.2-2014, be converted into mass concentration. 7.5.3 Rapid analysis for other aldoketone VOCs After the end of the cyclic enrichment, within 30 s, turn on the gas circuit switch (position 5 in Figure 1); connect the rapid VOCs analyzer (position 15 in Figure 1) with the on-site and rapid collection equipment. At a rate of 100 mL/min, collect the gas in the mask body into the rapid analyzer for other aldoketone VOCs. At the same time of collecting, at the left supply port (position 1 in Figure 1), at the same flow rate, replenish nitrogen (6.2) to the mask body, to maintain the pressure balance in the system. When the sampling is completed, stop replenishing gas. When replenishing gas, at the left supply port (position 1 in Figure 1), it is possible to connect a supplementary gas bag (6.4) filled with nitrogen. After sampling, the connection shall be disconnected immediately. The sampling time and gas replenishing time are both 10 min. After the analysis is completed, the reading displayed on the rapid VOCs analyzer is the concentration value of other aldoketone VOCs. 7.5.4 Rapid analysis for non-aldoketone VOCs After the end of the cyclic enrichment, within 30 s, turn on the gas circuit switch (position 5 in Figure 1); connect the rapid VOCs analyzer (position 15 in Figure 1) with the on-site and rapid collection equipment. At a rate of 100 mL/min, collect the gas in the mask body into the rapid analyzer for non-aldoketone VOCs. At the same time of collecting, at the left supply port (position 1 in Figure 1), at the same flow rate, replenish nitrogen (6.2) to the mask body, to maintain the pressure balance in the system. When the sampling is completed, stop replenishing gas. When replenishing gas, at the left supply port (position 1 in Figure 1), it is possible to connect a gas bag (6.4) filled with nitrogen. After sampling, the connection shall be disconnected immediately. The sampling time ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 39764-2021 be delivered?Answer: The full copy PDF of English version of GB/T 39764-2021 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 39764-2021_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 39764-2021_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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