GB/T 613-2007Chemical reagent -- General method for the determination of specific optical rotatory power (specific optical rotation) [including MODIFICATION 1] (English PDF)

Foreword

The degree of consistency between this Standard and ISO 6353-1:1982, Reagents for

chemical analysis - Part 1: General test methods is non-equivalent.

This Standard replaces GB/T 613-1988 Chemical reagent - General method for the

determination of specific optical rotation. Compared with GB/T 613-1988, the main

changes are as follows:

-- Change the standard name to "specific optical rotatory power (specific optical

rotation)";

-- Add a chapter on normative references (Chapter 2 of this edition);

-- Adjust the symbol and unit of specific optical rotatory power (2.1 of the 1988

edition; Chapter 3 of this edition);

-- Modify the expression of the calculation formula (Chapter 6 of the 1988 edition;

Chapter 7 of this edition).

This Standard is proposed by China Petroleum and Chemical Industry Federation.

This Standard is under the jurisdiction of Subcommittee 3 on Chemical Reagent of

National Technical Committee 63 on Chemistry of Standardization Administration of

China (SAC/TC 63/SC 3).

Drafting organization of this Standard: Sinopharm Chemical Reagent Co., Ltd.

Main drafters of this Standard: Chen Haoyun, Chen Hong.

This Standard was first published in 1965, revised for the first time in 1977, and revised

for the second time in 1988.

Chemical reagent - General method for the determination of

specific optical rotatory power (specific optical rotation)

1 Scope

This Standard specifies a general method for determining the specific optical rotatory

power of chemical reagents using a polarimeter.

This Standard applies to the determination of the specific optical rotatory power of

chemical reagents.

2 Normative references

The provisions in the following documents become provisions of this Standard through

reference in this Standard. For dated references, all subsequent amendments (not

including errata content) or revisions do not apply to this standard. However, parties to

agreements that are based on this Standard are encouraged to study whether the latest

versions of these documents can be used. For undated references, the latest edition

applies to this Standard.

JJG 536-1998, Polarimeter and saccharimeter

3 Terms and definitions

The following terms and definitions are applicable to this Standard.

3.1

specific optical rotatory power

Optical rotatory power measured at the liquid layer of length 1 dm, concentration 1

g/mL, and temperature 20°C by the wavelength of sodium spectrum D line (589.3 nm).

The unit is degrees square meters per kilogram [(°) · m2/kg].

4 Principle of the method

When the polarized light transmitted from the polarizer passes through the sample, due

to the optical rotation of the sample material, its vibration direction changes by a certain

angle alpha. Rotate the analyzer at a certain angle to make the transmitted light intensity

equal to the incident light intensity, and this angle is the optical rotatory angle of the

sample.

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