摘要
通过试验计算并讨论水质分析中的方法检出限。得出以下结论:(1)目前关于检出限的计算,主要是根据多次平行测定空白样品的标准偏差来进行计算。(2)以碱性过硫酸钾消解紫外分光光度法测定水中总氮的检出限计算为例。根据空白值浓度表示的标准偏差来计算,3倍的标准偏差作为该方法的检出限,即0.049 mg/L,达到等于该标准方法所提出的检出限0.05 mg/L。以与扣除空白之后的0.01吸光度所对应的浓度值为检出限,根据各条校准曲线计算出的检出限不同。(3)采用离子色谱法测定水中磷酸盐的检出限为0.002 mg/L,比钼锑抗分光光度法中所提出的检出限(0.01 mg/L)低了1个数量级。
The detection limits of the water quality analysis method were calculated and discussed with case. The conclusions were that at the present, the detection limits of the method were mainly calculated by the standard deviation of parallel determination of multiple blank samples; as a study case, the detection limits of alkaline potassium persulfate digestion UV spectrophotometric method which detected total nitrogen in water was calculated, the three times the standard deviation of 0. 049 mg/L of blank samples concentration was regarded as the detection limits of the method, which was equal to that in the standard method of 0. 05 mg/L; the concentration of 0.01 absorbance excluding blank value was also regarded as the detection limits, different calibration curve which were different; and the detection limit of ion - chromatography was 0. 002 mg/L, which was lower than that of Mo - Sb anti - spectrophotometer （0. 01 mg/L ） , decreasing one order of magnitude.
出处
《广州化工》
CAS
2014年第10期169-171,共3页
GuangZhou Chemical Industry
关键词
方法检出限
空白样品
标准偏差
the detection limits of the method
blank sample
standard deviation
作者简介
夏春（1984-），女，助理工程师，主要从事环境监测工作。
