GB/T 13081-2022 Translated English of Chinese Standard (GB/T 13081-2022, GBT13081-2022): Determination of mercury in feeds [Buy--download True-PDF in 3-second: https://play.google.com/books > Sign in > This BOOK > "3-dots" > Export > Save as "*.pdf"]https://www.chinesestandard.net, 2024 M04 9 - 16 pages This document describes the atomic fluorescence spectrometry, cold atomic absorption spectrometry, and direct injection methods for the determination of total mercury in feeds. This document is applicable to the determination of total mercury in compound feeds, concentrated feeds, concentrate supplements, additive premixed feeds, feed raw materials, and feed additives. Atomic fluorescence spectrometry: When the sample weight is 0.5 g and the constant volume is 50 mL, the method detection limit is 0.6 ¦Ìg/kg and the quantification limit is 3 ¦Ìg/kg. Cold atomic absorption spectrometry: When the sample weight is 2 g and the constant volume is 100 mL, the method detection limit is 3 ¦Ìg/kg and the quantitation limit is 10 ¦Ìg/kg. Direct injection method: When the sample weighing amount is 0.1 g, the detection limit of the method is 0.3 ¦Ìg/kg, and the quantification limit is 1 ¦Ìg/kg. |
Common terms and phrases
100 mL volumetric acid solution 6.2.3 amount of water Analytical balance argon arithmetic mean atomic absorption spectrometry atomic fluorescence spectrometry borosilicate glass bottle bottle and store Carrier gas certified reference material cold atomic absorption condenser tube digestion liquid dilute to volume Direct injection method document Erlenmeyer flask flow rate fume hood hollow cathode lamp hydrogen peroxide low-concentration standard series mark with nitric mass concentrations mass fraction mercury content Mercury standard intermediate mercury standard stock merge the washing microwave digestion milliliters mL of mercury mL of nitric mL of water mL volumetric flask nitric acid 5.2.2 nitric acid solution pipette 1 mL polytetrafluoroethylene digestion tube potassium borohydride potassium hydroxide Prepare it fresh reduction bottle sample solution slowly add solution 1 mg/mL solution II 4.2.5 standard intermediate solution standard series solutions standard stock solution standard working solution stannous chloride sulfuric acid temperature Amalgam decomposition Test data processing validity period washing liquid µg/mL