GB/T 23990-2009 PDF EnglishUS$190.00 · In stock · Download in 9 seconds
GB/T 23990-2009: Determination of contents of benzene, toluene, ethylbenzene and xylene in coatings by gas chromatography 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 23990-2009: Determination of contents of benzene, toluene, ethylbenzene and xylene in coatings by gas chromatography---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/GBT23990-2009 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 87.040 G 50 Determination of contents of benzene, toluene, ethylbenzene and xylene in coatings by gas chromatography ISSUED ON: JUNE 02, 2009 IMPLEMENTED ON: FEBRUARY 01, 2010 Issued by: General Administration of Quality Supervision, Inspection and Quarantine of PRC; Standardization Administration of PRC. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Principle ... 4 4 Reagents and materials ... 4 5 Equipment ... 5 6 Sampling ... 5 7 Gas chromatography test conditions ... 6 8 Determination of benzene, toluene, ethylbenzene and xylene content in solvent-based coatings (method A) ... 6 9 Determination of benzene, toluene, ethylbenzene and xylene content in water-based paint (method B) ... 9 10 Test report ... 11 Determination of contents of benzene, toluene, ethylbenzene and xylene in coatings by gas chromatography1 ScopeThis standard specifies the use of gas chromatography to determine the content of benzene, toluene, ethylbenzene and xylene in coatings. In this standard, Method A is suitable for the determination of benzene, toluene, ethylbenzene and xylene content in solvent-based coatings; Method B is suitable for the determination of benzene, toluene, ethylbenzene and xylene content in water-based coatings.2 Normative referencesThe 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 3186 Paints varnishes and raw materials for paints and varnishes - Sampling (GB/T 3186-2006, ISO 15528:2000, IDT)3 PrincipleAfter the specimen is diluted, it is directly injected into the gas chromatograph, the tested compound is separated by chromatographic separation technology, detected by a hydrogen flame ionization detector, quantified by internal standard method.4 Reagents and materials4.1 Carrier gas: nitrogen, purity ≥ 99.995%. 4.2 Fuel gas: hydrogen, purity ≥ 99.995%.7 Gas chromatography test conditions7.1 Test conditions 1 of gas chromatography Chromatographic column: polydimethylsiloxane capillary column, 30 m × 0.32 mm inner diameter × 0.25 μm film thickness; Inlet temperature: 250 °C; Column temperature: Keep the initial temperature at 40 °C for 5 min; then increase to 260 °C at 10 °C/min and keep it for 5 min; Detector temperature: 280 °C; Carrier gas flow rate: 1.0 mL/min; Split ratio: Split injection, wherein the split ratio is adjustable. 7.2 Test conditions 2 of gas chromatography Chromatographic column: 6% cyanopropyl phenyl/94% polydimethylsiloxane capillary column, 60 m × 0.32 mm inner diameter × 1.0 μm film thickness; Inlet temperature: 200 °C; Column temperature: keep the initial temperature at 65 °C for 16 min, raise it at 15 °C/min to 130 °C for 5 min; then increase it at 10 °C/min to 150 °C and keep it for 7 min; Detector temperature: 300 °C; Carrier gas flow rate: 0.9 mL/min for 15 min, raise to 1.5 mL/min at 10 mL/min2 and keep for 10 min, then raise to 4 mL/min at 30 mL/min2 and keep for 2 min. Split ratio: Split injection, wherein the split ratio is adjustable. Note: The best gas chromatograph test conditions can also be selected according to the performance of the gas chromatograph used and the actual situation of the specimen to be tested. 8 Determination of benzene, toluene, ethylbenzene and xylene content in solvent-based coatings (method 5%. 8.5.2 Reproducibility The relative deviation of test results between different laboratories is less than 10%. 9 Determination of benzene, toluene, ethylbenzene and xylene content in water-based paint (method B) All tests are carried out in two parallel determinations. 9.1 Optimization of chromatograph parameters According to the chromatographic conditions in Chapter 7, the known calibration compound shall be used to optimize it every time, so that the sensitivity, stability and separation effect of the instrument are in the best state. 9.2 Qualitative analysis of products 9.2.1 Optimize the instrument parameters as shown in 9.1. 9.2.2 Determination of the retention time of the test compound: Inject 1.0 μL of the standard solution containing the test compound as shown in 4.6; record the retention time of each test compound. 9.2.3 Qualitative inspection of the tested compound in the sample: Take about 1 g of the sample and use the diluent solvent acetonitrile (4.7) to dilute it; inject 1.0 μL into the chromatograph, to determine whether there is the tested compound. 9.3 Calibration 9.3.1 Weigh a certain amount (accurate to 0.1 mg) of various calibration compounds in a sample bottle. The weighed amount shall be equivalent to the respective content of the product to be tested. Weigh an internal standard substance (4.5) similar to that of the test compound in the same sample bottle; use the dilution solvent acetonitrile (4.7) to dilute and mix it; seal the sample bottle and shake well; then place it under the conditions same as the tested specimen to perform separation and determination. 9.3.2 Test of relative correction factor: Optimize the instrument parameters according to the provisions of 9.1 under the same chromatographic conditions as the test sample. Inject an appropriate amount of calibration compound into the gas chromatograph and record the chromatogram. Calculate the relative ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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