Foreword

This standard replaces the determination part of potassium and sodium in GB/T 5009.91-2003 “Determination of potassium and sodium in foods”, GB/T 15402-1994 “Fruits, vegetables and derived products-Determination of sodium and potassium”, NY 82.18-1988 “Determination method of fruit juice Determination of sodium and potassium”, and GB 5413.21-2010 “Determination of calcium, iron, zinc, sodium, potassium, magnesium, copper and manganese in foods for infants and young children, milk and milk products”, GB/T 18932.11-2002 “Method for the determination of potassium, phosphorus, iron, calcium, zinc, aluminium, sodium, magnesium, boron, manganese, copper, barium, titanium,vanadium, nickel, cobalt, chromium contents in honey-Inductively coupled plasma atomic emission spectrometric (ICP-AES) method”, 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” and NY/T 1653-2008 “Determination for mineral elements in vegetables, fruits and derived products by ICP-AES method”.

Compared with the above standards, the major changes of this standard are as follows:

——the standard name has been revised to “National food safety standard Determination of potassium and sodium in foods;

——the flame atomic absorption spectrometry has been revised as Method I, flame atomic emission spectrometry to be Method II, inductively coupled plasma atomic emission spectrometry to be Method III and inductively coupled plasma mass spectrometry to be Method IV;

——the partial content of preparation of test sample has been revised;

——the partial content of test sample digestion has been revised;

——the method detection limit and quantification limit have been added;

——the “Annex” has been added.