標準編號:	GB/T 5009.87-2003
中文名稱:	食品中磷的測定
英文名稱:	Determination of phosphorus in foods
行業(yè)分類:	GB    國家標準
發(fā)布機構(gòu):	國家質(zhì)量監(jiān)督檢驗檢疫總局
發(fā)布日期:	2003-8-11
實施日期:	2004-1-1
標準狀態(tài):	superseded
被新標準替代:	GB 5009.87-2016 食品安全國家標準 食品中磷的測定
被替代日期:	2017-6-23
替代舊標準:	GB/T 12393-1990 食物中磷的測定方法
翻譯語言:	英文
文件格式:	PDF
中文字符數(shù):	4000 字
翻譯價格(元):	280.0
交付時間:	付款后 1 個工作日

1 Scope This standard specifies determination of phosphorus content in foods by spectrophotometric method. Method I and Method II of this standard are applicable to determination of total phosphorus in foods; Method III is applicable to determination of compound phosphate in Western cooked and smoked ham (by phosphate). Detection limit of Method I and Method II is both 2μg; linear range: 5 μg~50 μg for Method I - spectrophotometric method; 2 μg~10 μg for Method II - molecular absorption spectrophotometric method. Method I Spectrophotometric Method 2 Principle Organic substances in foods are oxidized by acid to make phosphorus combined with ammonium molybdate under acidic conditions to generate ammonium phosphomolybdate. Such compound is reduced by hydroquinone and sodium sulfite to a kind of blue compound - molybdenum blue. Spectrophotometer is used to measure the light absorption value of molybdenum blue at a wavelength of 660 nm, so as to conduct quantitative analysis of phosphorus content. 3 Reagents 3.1 Sulfuric acid: relative density, 1.84. 3.2 Perchloric acid - nitric acid digestive solution: 1+4 mixed solution.