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GB 5009.234-2016Method for analysis of hygienic standard of soybean sauce (English PDF)

食品安全国家标准

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Issued by

National Health and Family Planning Commission of the PRC Foreword ...........................................

Level / Type

National · Mandatory

Issue date

August 31, 2016

Implementation date

March 1, 2017

Scope

GB 5009.234-2016 is the English-translated version of 食品安全国家标准.

GB 5009.234-2016 is the Chinese standard "Method for analysis of hygienic standard of soybean sauce". Its scope clause reads: This Standard specifies the method for determination of ammonium salt in soy sauce.

This Standard applies to the determination of ammonium salt in soy sauce. Its clauses include principle; reagents and materials.

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Document preview — GB 5009.234-2016

National Standard of the People's Republic of China

Issued by: National Health and Family Planning Commission of the PRC Foreword ...........................................

Foreword3
1 Scope4
2 Principle4
3 Reagents and materials4
4 Instruments and apparatuses5
5 Analysis steps5
6 Description of the analysis result5
7 Precision6
8 Others6

1 Scope

This Standard specifies the method for determination of ammonium salt in soy sauce.

This Standard applies to the determination of ammonium salt in soy sauce.

2 Principle

Heat and distill the sample in the alkaline solution to free the ammonia, which is absorbed by the boric acid solution; then use hydrochloric acid standard solution to titrate and calculate the content.

3 Reagents and materials

3.1 Reagents

Unless otherwise specified, all the reagents in this method are analytical reagents, the water is grade-1 water that is specified by GB/T 6682.

3.1.1 Magnesium oxide (MgO).

3.1.2 Boric acid (H3BO3).

3.1.3 Methyl red (C 15 H 15N 3 O2).

3.1.4 Bromocresol green (C 15H 14 Br4O5 S).

3.1.5 Ethanol (C 2H 5OH).

3.2 Preparation of reagents

3.2.1 Boric acid solution (20 g/L): weigh 20.0 g of boric acid; add water to dissolve;

dilute to 1 000 mL.

3.2.2 Hydrochloric acid standard titration solution [c(HCl)] = 0.100 mol/L.

3.2.3 Mixing indicator solution: 1 part of methyl red-ethanol solution (2 g/L) and 5 parts of bromocresol green-ethanol solution (2 g/L); prepare when it is needed.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 6 pages — is available in the English PDF.

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