GB 5009.12-2010 Translated English of Chinese Standard. GB5009.12-2010: National food safety standard - Determination of lead in foodshttps://www.chinesestandard.net, 2 thg 9, 2016 - 26 trang This Standard specifies the method for the determination of lead in foods. This Standard applies to the determination of lead in foods. |
Nội dung
4 | |
Scope | 5 |
Instruments and apparatuses | 6 |
Analysis procedures | 7 |
Calculation of results | 9 |
Hydride generation atomic fluorescence spectrometry | 10 |
Instruments and apparatuses | 11 |
Calculation of results | 12 |
Calculation of results | 15 |
Degree of precision | 16 |
Instruments and apparatuses | 18 |
Calculation of results | 21 |
Degree of precision | 22 |
Analysis procedure | 23 |
Calculation of results | 24 |
Degree of precision | 25 |
Degree of precision | 13 |
Analysis procedure | 14 |
Annex A Informative Polarograms of lead in reagent blank control standard lead solution | 26 |
Thuật ngữ và cụm từ thông dụng
100 mL volumetric 25 mL volumetric accurate to 0.01 acid is added added into 100 allowed to cool Ammonium persulfate arithmetic mean blank control solution Bromothymol blue chloroform layer diluted with water disulfide hydrazone following procedure g of sample g or mL hollow cathode lamp hydrochloric acid hydroxylamine lead content lead stock solution lead working solution low power mixed acid mixed evenly mL nitrogen determination mL of hydrochloric mL of nitric mL of water mL separator funnels mL volumetric flask muffle furnace ng/mL nitric acid 1+1 nitrogen determination flask obtained under repeatability optical densities oxalic acid perchloric acid phenol red phosphoric acid polarography porcelain crucible provide blank control reagent blank control repeatability conditions sample accurate sample digestion solution sample is calculated sample solution small amount sodium sodium borohydride sodium hydroxide solution 1.0 mg/mL solution 200 g/L solution is transferred standard curve Standard lead stock standard series sulphuric acid transferred into muffle