聚乙烯醇存在下结晶紫—杂多酸光度法测定地表水中微量磷酸盐和硅酸盐  

Spectrophotometric Determination of Trace Phosphates and Silicates in Ground Water with He1 eropoly Acids—Crystal Violet in the Presence of Polyvinyl Alcohol

作　　者：李惠珍[1] 李桂英[1] 顾范博[1] 

机构地区：[1]苏州医学院化学教研室

出　　处：《苏州医学院学报》1991年第3期230-232,257-258,共3页Acta Academiae Medicinae Suzhou

摘　　要：<正> 磷酸盐和硅酸盐的测定一般都用分光光度法中的钼黄法和钼蓝法。钼黄法相当稳定,但灵敏度低;钼蓝法的灵敏度虽有所提高,但这些有色配合物的摩尔吸光系数都未超过1×10~4。近年来用结晶紫—杂多酸分光光度法同时测定磷、硅和砷,然而砷和硅的含量只能用减差法求出,误差较大。由于地表水中含磷。In the presence of polyvinyl alcohol the optical condition for the quantitative formation of the ion-association of heteropoly phosphomolybdic acid and heteropoly silico-molybdic acidwith crystal violet in aqueous phase is described.The calibration curve was linear 0.5～6.0μg ofP/25ml and 0.1～10μg of Si/25ml.The molar absorptivity was 1.5×10~5(P)and 1.8×10~5(Si).This complex stands stably within 3 hours.This method has been applied to the trace analy-sis of P and Si in human hair and water with satisfactory results.

关 键 词：地表水 磷酸盐 硅酸盐 分光光度法 

分 类 号：X132[环境科学与工程—环境科学]