GB/T 14571.4-2022 PDF EnglishUS$185.00 · In stock · Download in 9 seconds
GB/T 14571.4-2022: Test method of ethylene glycol for industrial use - Part 4: Determination of ultraviolet transmittance - Ultraviolet spectrophotometric 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 GB/T 14571.4: Historical versions
Similar standardsGB/T 14571.4-2022: Test method of ethylene glycol for industrial use - Part 4: Determination of ultraviolet transmittance - Ultraviolet spectrophotometric 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/GBT14571.4-2022 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.080.60 CCS G 16 Replacing GB/T 14571.4-2008 Test method of ethylene glycol for industrial use - Part 4. Determination of ultraviolet transmittance - Ultraviolet spectrophotometric method Issued on. APRIL 15, 2022 Implemented on. NOVEMBER 01, 2022 Issued by. State Administration for Market Regulation; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 Introduction... 5 1 Scope... 6 2 Normative references... 6 3 Terms and definitions... 6 4 Method summary... 7 5 Reagents or materials... 7 6 Instruments... 7 7 Sampling... 8 8 Test steps... 8 9 Test data processing... 11 10 Precision... 11 11 Quality control and assurance... 12 12 Report... 12 Annex A (normative) Method for determination of absorbance of reference water... 13ForewordThis document was drafted in accordance with the rules given in GB/T 1.1-2020 "Directives for standardization - Part 1.Rules for the structure and drafting of standardizing documents". This document is Part 4 of GB/T 14571 "Test method of ethylene glycol for industrial use". The following parts of GB/T 14571 have been issued. -- Part 1.Determination of acidity - Titration method; -- Part 2.Determination of purity and impurities - Gas chromatography; -- Part 3.Determination of content of aldehydes; -- Part 4.Determination of ultraviolet transmittance - Ultraviolet spectrophotometric method; -- Part 5.Determination of chloride ion - Ion chromatography. This document replaces GB/T 14571.4-2008 "Ethylene glycol for industrial use - Determination of ultraviolet transmittance - Ultraviolet spectrophotometric method". Compared with GB/T 14571.4-2008, in addition to the structural adjustments and editorial changes, the main technical changes in this document are as follows. a) The provisions for directly measuring and reporting the UV transmittance at each wavelength are added (see Chapter 4, 8.3.1, 9.1 of this Edition); b) The preparation basis of "holmium oxide standard solution, potassium dichromate standard solution, sodium iodide standard solution" is changed (see 5.7, 5.8, 5.9 of this Edition; 4.2, 4.4, 4.6 of Edition 2008); c) The instrument performance requirements for "ultraviolet spectrophotometer" are changed (see 6.1 of this Edition; 5.1 of Edition 2008); d) The chapter "Instruments" is changed (see Chapter 6 of this Edition; Chapter 7 of Edition 2008); e) The pairing requirements for "quartz absorption cell" are added (see 6.2 of this Edition); f) The nitrogen purge flow rate and time are changed (see 8.2.2 of this Edition; 8.2 of Edition 2008); g) The steps for directly measuring the UV transmittance of the specimen are added (see 8.3.1 of this Edition); h) The expression of "test data processing" is changed (see Chapter 9 of this Edition; Chapter 10 of Edition 2008); i) The precision is changed (see Chapter 10 of this Edition; Chapter 11 of Edition 2008); j) "Quality control and assurance" is added (see Chapter 11 of this Edition); k) "Method for determination of absorbance of reference water" is changed (see Annex A of this Edition; Annex B of Edition 2008). Attention is drawn to the possibility that some elements of this document may be the subject of patent rights. The issuing authority shall not be held responsible for identifying any or all such patent rights. This document was proposed by China Petroleum and Chemical Industry Federation. This document shall be under the jurisdiction of National Technical Committee on Chemical of Standardization Administration of China (SAC/TC 63). The drafting organizations of this document. Sinopec Shanghai Petrochemical Research Institute. Main drafters of this document. Xu Jingzao, Zhang Yuhong, Wang Chuan, Peng Zhenlei, Li Chengwei. This document was issued in 2008 for the first time. This is the first revision.1 ScopeThis document specifies the method for determination of the UV light transmittance of ethylene glycol for industrial use in the wavelength range of 200nm~350nm. This document is applicable to the determination of the UV light transmittance of ethylene glycol for industrial use.2 Normative referencesThe following referenced 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 3723, Sampling of chemical products for industrial use - Safety in sampling GB/T 6680, General rules for sampling liquid chemical products GB/T 6682, Water for analytical laboratory use - Specification and test methods GB/T 8170, Rules of rounding off for numerical values and expression and judgement of limiting values JJG 178-2007, Verification Regulation of Ultraviolet, Visible, Near-Infrared Spectrophotometers3 Terms and definitionsThis document does not have terms and definitions that need to be defined.4 Method summaryPlace the specimen in a 10mm quartz absorption cell. Use water as a reference. Directly determine the UV transmittance at 220nm, 250nm, 275nm and 350nm.5 Reagents or materials5.1 Unless otherwise specified, all reagents used are analytically pure. 5.2 Holmium oxide wavelength calibration filter. qualified after calibration. 5.3 Transmittance filter in the ultraviolet region. qualified after calibration. 5.4 Cut-off filter. 5.5 Isooctane. spectrally pure. 5.6 Naphthalene solution (1mg/L). commercially available or dissolve 1mg of naphthalene in 1000mL of spectroscopically pure isooctane. 5.9 Sodium iodide standard solution (10g/L). prepare according to C.1 in JJG 178-2007. 5.10 Nitrogen. purity ≥ 99.99% (volume fraction); without oil. 5.11 Reference water. grade one water in compliance with GB/T 6682; the absorbance at 220nm is not greater than 0.01.The absorbance of water shall be tested in accordance with Annex A.6 Instruments6.1 UV spectrophotometer Double beam. Determination wavelength is 200nm~400nm. The absorbance accuracy is better than 0.001.The working wavelength of the instrument is divided into two sections, namely section A (190nm~340nm) and section B (340nm~400nm). 6.2 Quartz absorption cell A quartz absorption cell with an optical path of 10mm±0.01mm and a quartz absorption cell with an optical path of 20mm±0.01mm. 6.3 Nitrogen stripping device Fix the oil-free pressure reducing valve on the nitrogen cylinder or nitrogen pipeline. Connect with the flow control valve and the closed glass tube (6.6) inserted into the 25mL volumetric flask or Erlenmeyer flask through a pipeline of appropriate material (such as a polyethylene tube). All parts need to be clean and free from pollution. Specimen shall avoid contact with plastic products containing plasticizers. 6.4 Reagent bottles The capacity is at least 500mL. It is equipped with a bottle cap with good sealing. 6.5 Volumetric flasks or Erlenmeyer flasks Capacity is 25mL. 6.6 Closed glass tube Glass part of plastic head dropper.7 SamplingAccording to the provisions of GB/T 3723 and GB/T 6680, take samples at a gentle flow rate. When the distance between the liquid level and the bottle mouth is less than 10mm, stop sampling. Immediately cover to store sample. Avoid violent shaking of samples. Analyze as soon as possible.8 Test steps8.1 Test preparation 8.1.1 Start-up preparation The instrument starts up and enters the hardware self-inspection. After a period of stability, set the instrument parameters. A bandwidth of 2.0nm is used. 8.1.2 Instrument verification 8.1.2.3 Stray light Use sodium iodide standard solution (5.9), or cut-off filter (5.4) to measure the transmittance of the photometer at 220nm (i.e., stray light), which shall meet the requirements of 6.1. 8.1.3 Glassware preparation Use hydrochloric acid-water-methanol solution (1.3.4, volume ratio) or chromic acid washing solution to thoroughly clean the absorption cell and other glassware. 8.2 Specimen pretreatment 8.3 Specimen analysis 8.3.1 Direct method Fill the reference water (5.11) into two paired 10mm quartz absorption cells. Place the absorption cell in the cell holder of the photometer. 8.3.2 Absorbance method Fill the reference water (5.11) into two paired 10mm quartz absorption cells. Place the absorption cell in the cell holder of the photometer. Pay attention to the direction of the absorption cell. Measure the absorbance at the wavelengths of 220nm, 250nm, 275nm and 350nm.9 Test data processing9.1 If it is determined by 8.3.1, directly report the light transmittance of the specimen at the relevant wavelength. 9.2 If it is determined by 8.3.2, calculate the net absorbance (Aλ) of the specimen at each wavelength under the 10mm optical path according to formula (1). 9.3 Analysis results Take the arithmetic mean of the two repeated measurement results. Report the light transmittance of the specimen at the relevant wavelength. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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