GB 5009.12-2017 Translated English of Chinese Standard. GB5009.12-2017: National Food Safety Standard - Determination of Lead in Foodshttps://www.chinesestandard.net, 21 mai 2017 - 20 pages This Standard specifies graphite furnace atomic absorbance spectrometry, inductively coupled plasma mass spectrometry, flame atomic absorbance spectrometry, dithizone colorimetry for the determination of lead in foods. This Standard applies to the determination of lead all kinds of foods. |
Table des matières
Foreword | 5 |
Apparatus | 6 |
Analytical Procedure | 7 |
Expression of Analytical Results | 8 |
Accuracy | 9 |
Apparatus | 11 |
Expression of Analytical Results | 12 |
Accuracy | 13 |
Apparatus | 15 |
Analytical Procedure | 16 |
Expression of Analytical Results | 17 |
Annex A Temperature Rise Procedure for Microwave Digestion | 18 |
Expressions et termes fréquents
absorbance value add 10 mL Add 2 mL add nitric acid adjust pH Adjustable electric furnace ammonium citrate solution ammonium hydroxide solution ammonium sulfate arithmetic mean Atomic absorbance spectrometer bromothymol blue Colorimetry comparing with standard content in test digestion inner tank digestion liquid digestion tank dilute to 100 dithiocarbamate dithizone working solution dithizone-trichloromethane solution 0.5 ethyl alcohol flame atomizer g accurate Graphite Furnace Atomic guaranteed reagent hollow cathode lamp Hydrochloric acid indicator 1 g/L Inductively Coupled Plasma lead content Lead nitrate Lead standard stock mass concentrations measure 50 mL measure absorbance mg/kg or mg/L MIBK microwave digestion mL of ammonium mL of lead mL of nitric mL of water mL separating funnel mL volumetric flask nitric acid solution Perchloric acid pH to turning phenol red potassium cyanide PTFE solution 0.5 g/L solution 1 g/L solution 200 g/L specimen solution Spectrometry standard serial solution standard series Standard substance water to dissolve