HJ 704-2014 in English

本标准规定了测定土壤中有效磷的碳酸氢钠浸提-钼锑抗分光光度法。
本标准适用于石灰性和中性土壤中有效磷的测定。
当取样量为2.50 g，使用50ml 碳酸氢钠溶液浸提，采用10 mm 比色皿时，本方法检出限为0.5 mg/kg，测定下限为2.0 mg/kg。

Scope

This standard specifies the sodium bicarbonate extraction-molybdenum antimony spectrophotometric method for the determination of available phosphorus in soil. This standard is applicable to the determination of available phosphorus in calcareous and neutral soils. When the sampling amount is 2.50 g, 50 ml of sodium bicarbonate solution is used for extraction, and a 10 mm cuvette is used, the detection limit of this method is 0.5 mg/kg, and the lower limit of determination is 2.0 mg/kg.