GB 5009.3-2016 National Standards for Food Safety - Determination of Water in Foods
GB 5009.3-2016 National Standards for Food Safety - Determination of Water in Foods
Basic Information
Scope
This standard specifies the methods for determining the moisture content in food.
The first method (direct drying method) of this standard is applicable to the determination of moisture content in vegetables, grains and their products, aquatic products, soybean products, dairy products, meat products, marinated products, grains (with a moisture content of less than 18%), oils (with a moisture content of less than 13%), starch, and tea, etc. It is not applicable to samples with a moisture content of less than 0.5 g/100 g. The second method (reduced pressure drying method) is applicable to the determination of moisture content in samples that are easily decomposed at high temperatures and samples with high moisture content (such as sugar, monosodium glutamate, etc.), but it is not applicable to the determination of moisture content in candy with added ingredients (such as milk candy, soft candy, etc.) or samples with a moisture content of less than 0.5 g/100 g (except for sugar and monosodium glutamate). The third method (distillation method) is applicable to the determination of moisture content in foods with high water content and volatile components, such as fruits, spices, and seasonings, as well as meat and meat products, but it is not applicable to samples with a moisture content of less than 1 g/100 g. The fourth method (Karl Fischer method) is applicable to the determination of trace moisture content in food, but it is not applicable to the determination of moisture content in food containing oxidants, reductants, alkali oxides, hydroxides, carbonates, boric acid, etc. The Karl Fischer volumetric method is applicable to samples with a moisture content of greater than 1.0×10-3 g/100 g.