Foreword

This standard replaces Section “4.1” of GB/T 5009.37-2003 “Method for analysis of hygienic standard of edible oils”; besides, it also replaces section “14.3” of GB/T 5009.44-2003 “Method for analysis of hygienic standard of meat and meat products”, section “4.1”, section “4.2” and section “4.3” of GB/T 5009.56-2003 “Method for analysis of hygienic standard of pastry” and section “4.1” of GB/T 5009.77-2003 “Method for analysis of hygienic standard of edible hydrogenated oil”, GB/T 15689-2008 “Oilseeds–Determination of acidity of oils”, GB/T 14489.3-1993 “Method for determination of free fatty acids content of oils in oilseeds” and GB/T 5530-2005 “Animal and vegetable oils and fats–Determination of acid value and acidity”.

Compared with section “4.1” of GB/T 5009.37-2003, the main changes of this standard are as follows:

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

———the scope of application of this standard has been revised;

———the titration method of phenolphthalein indicator has been revised as “Method I”, namely, cold solvent indicator titration;

———the cold solvent automatic potentiometric titration has been added as “Method II”;

———the hot ethanol indicator titration has been added as “Method III”;

———the specifications for preparation of test sample from food sample have been added;

———the requirements for sampling weight of test sample have been added;

———the requirements for precision have been revised.