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应用赤霉素－二氯化锡混合液作为钼蓝法的新显色剂。在 1.0 mol/L HNO3介质和有机相中 ，赤霉素－二氯化锡混合物与无机磷杂多酸反应生成杂多蓝，经萃取分离测定有机相，最大吸收波长为 690 nm，表观摩尔吸光系数为 2.36× 104 L· mol－ 1· cm－ 1。质量浓度范围在 0～ 3.0 mg/L符合朗伯－比尔定律。赤霉素－二氯化锡混合还原剂还原速度快，产物稳定性好，操作简便，该法用于水中无机磷的测定，结果令人满意。“,”A mixed solution of gibberellin and tin dichloride was used as a reducing colour reagent in molybdenum blue method for the determination of inorganic phosphate in water.In the medium of 1.0 mol/L HNO3 inorganic phosphate reacts with ammonium molybgate to form yellowish phosphomolybdic hetero_ polyacid,which then reacts with the mixture to form phosphomolybdic blue in organic phase.Content of inorganic phosphate is determined by spectrophotometry with a wavelength of 690 nm.Apparent molar absorptivity is 2.36× 104 L· mol－ 1· cm－ 1.Lambert－ Beer law is obeyed in the range of 0～ 3.0 mg/L for .The reducing reaction rate of the mixture is fast,the stability of the product is good and the operation is convenient.This method was satisfactorily applied to the determination of inorganic phosphate in waste water and pool water.