Valid

GB 5009.233-2016Method for analysis of hygienic standard of vinegar (English PDF)

食品安全国家标准

Preview PDF

This is a limited preview

Buy now to download the full PDF (5 pages)

Need quotation for your management?

Get a formal quotation for GB 5009.233-2016 in 30 minutes.

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 5009.233-2016 is the English-translated version of 食品安全国家标准.

GB 5009.233-2016 is the Chinese standard "Method for analysis of hygienic standard of vinegar". Its scope clause reads: This Standard specifies the method for determination of free mineral acid in vinegar.

This Standard applies to the determination of free mineral acid in vinegar. Its clauses include principle; reagents and materials.

Found what you need?

Document preview — GB 5009.233-2016

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 Analysis steps5
5 Analysis result5
6 Others5

1 Scope

This Standard specifies the method for determination of free mineral acid in vinegar.

This Standard applies to the determination of free mineral acid in vinegar

2 Principle

When there is free mineral acid (such as sulfuric acid, nitric acid, hydrochloric acid), the concentration of hydrogen ions increases, and the color of the indicator can be changed.

3 Reagents and materials

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 Reagents

3.1.1 Thymol blue.

3.1.2 Methyl violet (C 25H 30N 3Cl).

3.1.3 Sodium hydroxide (NaOH).

3.1.4 Ethanol (CH 3CH 2OH).

3.2 Preparation of reagents

3.2.1 Sodium hydroxide solution (4 g/L): take 2 g of sodium hydroxide to dissolve in water; add water to 500 mL.

3.2.2 Thymol blue test paper: take 0.10 g of thymol blue to dissolve in 50 mL of ethanol;

add 6 mL of sodium hydroxide solution (4 g/L); add water to 100 mL. Use the solution to soak the filter paper; then dry it, and store for later use.

3.2.3 Methyl violet test paper: weigh 0.10 g of methyl violet to dissolve in 100 mL of water; immerse the filter paper in this solution; take it out and dry it; store for later use.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 5 pages — is available in the English PDF.

How to Download GB 5009.233-2016

1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.