IS 3025-31-1-2022 水和廢水取樣和試驗方法(物理和化學) 第31部分 磷 第1節(jié) 用釩鉬磷酸、氯化亞錫、抗壞血酸和過硫酸鹽法測定
Methods of Sampling and Test ( Physical and Chemical ) for Water and Wastewater - Part 31 Phosphorus - Section 1 Determination by vanadomolybdo-phosphoric acid, stannous chloride, ascorbic acid and persulphate method