GB 5009.238-2016 Translated English of Chinese Standard. GB 5009.238-2016: National standard for food safety - Determination of water activity in foodsThis Standard specifies the Conwaydish diffusion method and the water activity meter diffusion method for determination of water activity in foods. This Standard is applicable to the determination of water activity in prepackaged cereal products, meat products, aquatic products, bee products, potato products, fruit products, vegetable products, milk powder and solid drinks. |
Contents
| 3 | |
Scope | 4 |
Instruments and equipment | 7 |
Analytical procedures | 8 |
Expression of the analysis results | 10 |
Precision | 11 |
Annex ATwodimensional straightline graphs for reference of water activity | 13 |
Common terms and phrases
200mL of hot accurate to 0.000 Accurately WEIGH 100g activity in foods activity meter diffusion ammonium sulfate arithmetic mean value barium chloride bromide solution water brown reagent bottle chloride solution water constant temperature incubator Conway’s dish diffusion COOL to form determination of water diffusive equilibrium dish at constant dish diffusion method form saturated solution GB/T gram g hot water humidity of 50 increment or decrement inner chamber lithium chloride magnesium nitrate MAINTAIN constant temperature measuring chamber meter diffusion method MIX evenly nitrate solution water outer chamber phase PLACE at room potassium bromide potassium carbonate potassium chloride potassium nitrate readily soluble temperature response value room temperature sample mass samples TAKE saturated salt solution Saturated sodium sodium bromide sodium chloride sodium nitrate solution of solid-liquid solution water activity standard saturated salt STORE saturated solution strontium nitrate strontium oxide Subclause unit of gram water activity Aw water activity meter week weighing dish containing