摘要
对现行GB/T6913-2008中关于正磷酸盐含量测定的溶液配制过程进行改进研究,试验操作可以更加高效地进行。改进方法:移取50.0mL水样或适量水样直接用纯水稀释至50.0mL,加入2.0mL钼酸铵溶液,1.0mL抗坏血酸溶液即可比色测量,实现批量配制、批量操作。且由于改进方法所用试剂最后加入,因此水样可提前批量配制,有效地提高了操作者的试验效率。同时,对该方法的校准曲线线性、精密性、准确度、回收率、检出限以及同国标方法的测量偏差等指标进行考核。改进方法校准曲线在0~3.20mg/L范围内相关系数r>0.9990,精密性RSD<0.5%,加标回收率范围为95.8%~105.8%,检出限低至0.008mg/L,使用改进方法与国标方法同时测定8份不同来源的水样时结果偏差均在±5.0%以内,此外,改进方法还具有广泛的适用性。改进后,操作者提高了试验效率,且与GB/T6913-2008相比具有同样良好的准确度、精密性和检出限。
The preparation process of solution for determination of orthophosphate content in GB/T6913-2008 was improved greatly,and experimental operations could be carried out more efficiently.Improved method:remove 50.0mL water sample or an appropriate amount of water sample and directly dilute it with pure water to 50.0mL,add 2.0mL ammonium molybdate solution,1.0mL ascorbic acid solution,and it could be colorimetric measure.This process could realize batch preparation and batch operation.Since the reagent used in the improved method was added at last,the water sample could be prepared in batches in advance.Thus effectively make the operator's experimental efficiency.At the same time,the calibration curve linearity,precision,accuracy,recovery rate,detection limit and measurement deviation with the national standard method were evaluated.The calibration curve of the improved method was within the range of 0~3.20mg/L,and the correlation coefficient r>0.9990,precision RSD<0.5%,the recovery rate reached 95.8%~105.8%.Using the improved method and national standard method for determination of eight different sources of water samples at the same time the result deviation was within±5.0%.The improved method has wide applicability.Compared with national standard method,the improved method has the same good accuracy,precision and detection limit.
出处
《电力科技与环保》
2020年第1期27-30,共4页
Electric Power Technology and Environmental Protection
关键词
正磷酸盐
钼锑抗分光光度法
回收率
精密度
准确度
检出限
orthophosphate
Mo-Sb-Vc spectrophotometry
recovery rate
precision
accuracy
detection limit
