GB/T 5009.18-2003 Translated English of Chinese Standard (GBT 5009.18-2003, GB/T5009.18-2003, GBT5009.18-2003): Determination of fluorine in foods
https://www.chinesestandard.net, 18. jun. 2019 - 14 sider
This standard specifies the method for determination of fluorine in foods such as grains, vegetables, fruits, beans and their products, meat, fish, eggs. This standard applies to the determination of fluorine in foods. The fluoride ion selective electrode method is not suitable for the specimens which have higher fat content but are not ashed.
40 mesh sieve 50 mL volumetric acetate solution 250 Acetic acid solution Acetone acid solution 20 Acidity meter Add 4 mL Add water adjust the pH Alizarin complexone solution arithmetic mean beaker Buffer solution content of fluorine crucible deionized water determination of fluorine distillation device distillation flask fluoride ion selective fluorine in foods fluorine standard solution g of sodium GB/T glacial acetic acid hydrochloric acid hydroxide solution 100 ion selective electrode ionic strength buffer Lanthanum nitrate solution Magnesium nitrate solution method is deionized Mix it uniformly mL of fluorine mL of water mL volumetric flask Muffle furnace nitrate solution 100 plastic box polyethylene plastic bottles Reagent The water reagents are stored separatory funnel silver sulfate-sulfuric acid Sodium acetate solution sodium citrate sodium hydroxide solution solution 100 g/L solution is equivalent spectrophotometer standard use solution sulfate-sulfuric acid solution sulfuric acid total ionic strength tube with stopper water to dilute Weigh