GB 5009.14-2017 Translated English of Chinese Standard. GB5009.14-2017: National Food Safety Standard - Determination of Zinc in Foodshttps://www.chinesestandard.net, 21 mai 2017 - 16 pages This Standard specifies the flame atomic absorption spectrometry method, the inductively coupled plasma emission spectroscopy method, the inductively coupled plasma mass spectrometry method and the dithizone colorimetric method in the determination of zinc in foods. This Standard is applicable to the determination of zinc in foods, irrespective of materials. |
Table des matières
| 3 | |
Scope | 4 |
Apparatus | 5 |
Analysis steps | 6 |
Expression of analysis results | 8 |
Principle | 9 |
Apparatus | 12 |
Expression of analysis results | 13 |
Precision | 14 |
Annex A Microwave digestion temperature rising program | 15 |
| 16 | |
Expressions et termes fréquents
accurately pipet accurately remove 0.500 acetic acid-acetate buffer acid solution 0.02 acid solution 1+1 acid solution 5+95 add 10 mL add water Adjustable heating plate ammonia Ammonia solution 1+99 arithmetic mean carbon tetrachloride layer cuvette Determination of Zinc Discard the carbon dithizone use solution dithizone-carbon tetrachloride solution g nearest GB/T guaranteed reagent hydrochloric acid solution Hydroxylamine inductively coupled plasma liquid sample mass concentration mass spectrometry measure 10 mL Measure the absorbance milligrams milliliters milliliters mL mL of nitric mL of water mL of zinc mL separatory funnel mL volumetric flask nitric acid solution Perchloric acid Phenol red polytetrafluoroethylene digestion tank reagent blank test respectively add sample OR accurately sampling volume set volume Sodium acetate sodium thiosulfate solution 0.02 mol/L solution 0.1 g/L solution 1000 mg/L solution 2 mol/L standard stock solution stock solution 1000 tetrachloride solution 0.1 weigh 0.2 g zinc content Zinc in Foods Zinc oxide Zinc standard stock