Download or read book HJ 491 2019 Translated English of Chinese Standard HJ 491 2019 HJ491 2019 written by https://www.chinesestandard.net and published by https://www.chinesestandard.net. This book was released on 2022-12-19 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Standard specifies the flame atomic absorption spectrophotometry for the determination of copper, zinc, lead, nickel and chromium in soil and sediment. This Standard applies to the determination of copper, zinc, lead, nickel and chromium in soil and sediment. When the sample volume is 0.2 g and the constant volume after digestion is 25 ml, the method detection limits for copper, zinc, lead, nickel and chromium are 1 mg/kg, 1 mg/kg, 10 mg/kg, 3 mg/kg and 4 mg/kg, respectively, and the lower limits of determination are 4 mg/kg, 4 mg/kg, 40 mg/kg, 12 mg/kg and 16 mg/kg, respectively.