Foreword

This standard replaces the method for determination of copper in GB/T 5009.13-2003 “Determination of copper in foods”, GB 5413.21-2010 “National food safety standard Determination of calcium, iron, zinc, sodium, potassium, magnesium, copper and manganese in foods for infants and young children, milk and milk products”, GB/T 23375-2009 “Determination of copper, iron, zinc, calcium, magnesium and phosphorus content in vegetables and derived products”, GB/T 9695.22-2009 “Meat and meat products - Determination of copper content”, GB/T 14609-2008 “Inspection of grain and oils - Determination of copper, iron, manganese, zinc, calcium, magnesium in cereals and derived products by atomic absorption and flame spectrophotometry”, GB/T 18932.12-2002 “Method for the determination of potassium, sodium, calcium, magnesium, zinc, iron, copper, manganese, chromium, lead cadmium contents in honey - Atomic absorption spectrometry”, NY/T 1201-2006 “Determination of copper, iron and zinc content in vegetables and derived products”.

Compared with GB/T 5009.13-2003, the major changes of this standard are as follows:

——the name of this standard has been revised to “National food safety standard Determination of copper in foods”;

——the wet digestion, pressure tank digestion and microwave digestion have been added in the pretreatment methods;

——the Graphite furnace atomic absorption spectrometry has been reserved as Method I, ammonium dihydrogen phosphate - palladium sulfate solution has been adopted as matrix modifier; the Flame atomic absorption spectrometry has been reserved as Method II; the Sodium diethyl dithiocarbamate colorimetric method has been deleted;

——the Inductively coupled plasma mass spectrometry has been added as Method III;

——oupled plasma mass spectrometry has been added as Method III;Method III;III;Sodium dieth

——oupled plasma mass spectrometrature procedures, the instrument conditions for reference of graphite furnace atomic absorption spectrometry and flame atomic absorption spectrometry have been added as annexes.