HJ 634-2012 in English

本标准规定了测定土壤中氨氮、亚硝酸盐氮、硝酸盐氮的氯化钾溶液提取－分光光度法。
本标准适用于土壤中氨氮、亚硝酸盐氮、硝酸盐氮的测定。
当样品量为40.0 g 时，本方法测定土壤中氨氮、亚硝酸盐氮、硝酸盐氮的检出限分别为0.10 mg/kg、0.15 mg/kg、0.25 mg/kg，测定下限分别0.40 mg/kg、0.60 mg/kg、1.00 mg/kg。

Scope

This standard specifies the potassium chloride solution extraction-spectrophotometric method for the determination of ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen in soil. This standard is applicable to the determination of ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen in soil. When the sample amount is 40.0 g, the detection limits of this method for determining ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen in soil are 0.10 mg/kg, 0.15 mg/kg, and 0.25 mg/kg respectively, and the lower detection limits are 0.40 mg/kg. kg, 0.60 mg/kg, 1.00mg/kg.