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GB/T 6488-2022 English PDF

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GB/T 6488-2022: Liquid chemicals - Determination of refractive index
Status: Valid

GB/T 6488: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 6488-2022English189 Add to Cart 3 days [Need to translate] Liquid chemicals - Determination of refractive index Valid GB/T 6488-2022
GB/T 6488-2008English199 Add to Cart 2 days [Need to translate] Liquid chemicals -- Determination of refractive index at 20 Celsius Obsolete GB/T 6488-2008
GB/T 6488-1986English199 Add to Cart 2 days [Need to translate] Test method for refractive index of chemical products Obsolete GB/T 6488-1986

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Basic data

Standard ID GB/T 6488-2022 (GB/T6488-2022)
Description (Translated English) Liquid chemicals - Determination of refractive index
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G04
Classification of International Standard 71.040.50
Word Count Estimation 10,160
Date of Issue 2022-10-14
Date of Implementation 2023-05-01
Older Standard (superseded by this standard) GB/T 6488-2008
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 6488-2022: Liquid chemicals - Determination of refractive index

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Liquid chemicals -- Determination of refractive index ICS 71.040.50 CCSG04 National Standards of People's Republic of China Replacing GB/T 6488-2008 Determination of Refractive Index of Liquid Chemical Products Published on 2022-10-12 2023-05-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" drafted. This document replaces GB/T 6488-2008 "Determination of Refractive Index of Liquid Chemical Products (20°C)", and is consistent with GB/T 6488-2008 In addition to structural adjustments and editorial changes, the main technical changes are as follows. a) Changed the temperature range (see Chapter 1, Chapter 1 of the.2008 edition); b) Added the principle of automatic refractometer (see 4.2); c) Changed the requirements for Abbe refractometers (see 6.1, 5.1 of the.2008 edition); d) Changed the correction method of Abbe refractometer (see 7.1, 6.2 of the.2008 edition); e) Added automatic refractometer measurement method (see 7.2); f) Added the content of the test report (see Chapter 8). Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by China Petroleum and Chemical Industry Federation. This document is under the jurisdiction of the National Chemical Standardization Technical Committee (SAC/TC63). This document was drafted by. Nanjing Guoyuan Standard Technical Service Co., Ltd., Shandong Institute of Product Quality Inspection, China Petroleum and Chemical Corporation Industry Federation, Shandong Linyi Sanfeng Chemical Co., Ltd., Shandong Huifeng Petrochemical Group Co., Ltd., Anton Paar (Shanghai) Trading Co., Ltd. Company, Haineng Future Technology Group Co., Ltd., Ningbo Zhongqin Testing Technology Co., Ltd., Fujian Yongrong Technology Co., Ltd. The main drafters of this document. Zou Huiling, Xia Pandeng, Qiu Ailing, Hao Yuan, Bai Yahao, Liu Mingzhen, Li Haitao, Li Haiyang, Cheng Zhanghong, Wang Zhigang, Zhang Zhenfang, Chen Jin, Yang Lixin, Ye Jiamei, Yuan Gengqing, Liu Hongyan. This document was first published in 1986, revised for the first time in.2008, and this is the second revision. Determination of Refractive Index of Liquid Chemical Products

1 Scope

This document describes a method for determining the refractive index of liquid chemical products using an Abbe refractometer and an automatic refractometer. This document is suitable for liquefaction of transparent or translucent, temperature range of 20℃~60℃, refractive index range of 1.3000~1.7000 Determination of industrial products.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document. GB/T 6682 Analysis Laboratory Water Specifications and Test Methods JJG130 Working glass liquid thermometer JJG625 Abbe Refractometer JJG2003 Thermocouple

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 Refractive index Under the condition of the D line of the sodium spectrum, the ratio of the speed of light in the air to the speed of light in the object to be measured or the input of light when it passes through the object to be measured from the air. The ratio of the sine of the incident angle to the sine of the refraction angle.

4 Principles

4.1 Abbe's refractometer The light from the measured material enters the prism and is refracted, then it conforms to the formula (1) of the law of refraction. sini sinr= (1) where. i ---incidence angle; r --- refraction angle; N --- the refractive index of the prism; n ---Refractive index of the measured substance. From the optically sparser medium to the optically denser medium, the incident angle is greater than the refraction angle, so that the incident angle i=90°, and substituting into formula (1), we get. sinr= n=N sinr (2)

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