Standard No.:	GB/T 5009.74-2003
English Name:	Method for limit test of heavy metals in food additives
Chinese Name:	食品添加剂中重金属限量试验
Chinese Classification:	C65    Labor safety technology in general
Professional Classification:	GB    National Standard
Issued by:	AQSIQ
Issued on:	2003-8-11
Implemented on:	2004-1-1
Status:	superseded
Superseded by:	GB 5009.74-2014 National Food Safety Standard-Method for limit test of heavy metals in food additives
Superseded on:	2016-3-21
Superseding:	GB/T 8451-1987 Method for limit test of heavy metals in food additives
Language:	English
File Format:	PDF
Word Count:	1500 words
Price(USD):	40.00
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Method for Limit Test of Heavy Metals in Food Additives



1 Scope

This standard specifies the method for limit test of heavy metals in food additives.

This standard is applicable to the limit test of heavy metals in food additives.

2 Principle

In the presence of weak acid (pH 3~4), heavy metal ion in the test sample will act with hydrogen sulfide to generate a substance in brownish black, which is compared to the lead standard solution experiencing the same treatment for limit test.

3 Reagents

3.1 Nitric acid.

3.2 Sulfuric acid.

3.3 Hydrochloric acid.

3.3.1 6 mol/L hydrochloric acid: measure 50mL of hydrochloric acid and dilute it with water to 100 mL.

3.3.2 1 mol/L hydrochloric acid: measure 8.3mL of hydrochloric acid and dilute it with water to 100 mL.