標準編號:	GB 5009.74-2014
中文名稱:	食品安全國家標準 食品添加劑中重金屬限量試驗
英文名稱:	National Food Safety Standard-Method for limit test of heavy metals in food additives
行業分類:	GB    國家標準
發布機構:	中華人民共和國國家衛生和計劃生育委員會
發布日期:	2015-09-21
實施日期:	2016-3-21
標準狀態:	valid
替代舊標準:	GB/T 5009.74-2003 食品添加劑中重金屬限量試驗
翻譯語言:	英文
文件格式:	PDF
中文字符數:	4000 字
翻譯價格(元):	240.0
交付時間:	付款后 1~3 個工作日

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 weak acid (pH 3~4) conditions, heavy metal ions in the specimen act with hydrogen sulfide, generating brownish black; compare it with the result generated by the limit test with standard lead solution. 3 Reagents and Materials Note: unless otherwise specified, the reagents used in this standard are all analytically pure, and the water used is Class I water specified in GB/T 6682. 3.1 Reagents 3.1.1 Nitric acid (HNO3). 3 1.2 Sulfuric acid (H2SO4). 3.1.3 Chlorhydric acid (HCl). 3.1.4 Ammonia (NH3?H2O). 3.1.5 Ammonium acetate (C2H7NO2). 3.1.6 Dihydroxy phalophenone (C2OH14O4). 3.1.7 Hydrogen dioxide (H2O2). 3.1.8 Hydrogen sulfide (H2S). 3.1.9 Perchloric acid (HClO4)