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通过改进钼酸胺分光光度法来测定工作场所空气中的磷酸,将样品洗脱后,在酸性溶液中,与钼酸铵生成磷钼酸,用抗坏血酸原剂,生成磷钼蓝,在700nm波长下进行测定.该方法线性关系好,检出限低,准确度和精密度高,使用安全方便.“,”The phosphoric acid in the air of the workplace was determined by the improvement of molybdate spectrophotometry. After the sample was eluted,phosphomolybdic acid was formed with ammonium molybdate in acid solution and phosphomolybdic blue with ascorbic acid reagent.700nm wavelength measurement.The method has good linearity,low detection limit,high accuracy and precision,and safe and convenient use.