聚乙烯醇指示剂用于医院污水总余氯的测定

Application for PVA Indicator (Polyvinyl Alcohol)to Determination of the Total Residual Chlorines of Foul Water in Hospital

目的 探讨医院污水总余氯测定新指示剂的使用。方法 参考《铁道法规汇编》提供的方法 ,应用PVA(聚乙烯醇 )作指示剂进行余氯测定。结果 对 4组不同浓度的样品用淀粉和PVA作指示剂进行测定 ,浓度分别为 7 39、9 5 1、5 5 6、12 4 7和 7 4 3、9 4 7、5 5 4、12 5 1mg L。结论 PVA(聚乙烯醇 )作指示剂 ,精密度和准确度均满足要求 ,且稳定性优于淀粉指示剂 ,故可取代。

Objective\ Search after making use of a new indicator to determine the total residual chlorines of foul water in hospital.Method\ According to te method offered from Railway Regulation Collection ,used PVA indicator (Polyvinyl alcohol) to determine the total residual chlorines.Result\ Used starch and PVA indicator to determine 4 group samples with different consistence respectively.The results were 7 39,9 51,5 56,12 47,and 7 43,9 47,5 54,12 51 mg/L.Conclusion\ Using PVA(Polyvinyl alcohol) as an indicator,the accuracy and precision satisfied the request and it's stability was more excellent than using a starch indicator.So PVA could replace starch as one indicator.