分光光度法测定余氯的线性范围探讨

Approach on Linear Range in Determination of Residual Chlorine by Spectrophotometry

用分光光度法测定水样中的余氯,按照国标GBll898—89中的要求,整个浓度范围内(余氯0-5刀omg/L)所制得的标准曲线的相关系数在099-0.999之间。经对其标准曲线的线性范围进行探讨发现,当余氯的浓度范围为0-1刀omg/L时,标准曲线的线性较好,相关系数>0999;当余氯的浓度>1刀omm/L,所绘制的标准曲线呈负偏离现象,相关系数<0.999。

According to the state-standard GB11898-89, to determine the residual chlorine in water by spectro-photometry, the correlative coefficient of calibration curve during whole concentration range (residual chlorine 0 ~ 5.00mg/l)was within 0.99 ~ 0.999. Approaching on the linear range of calibration curve, it was found that the linear was better, and the correlative coefficient was >0.999 when the concentration range of residual chlorine was among 0 ~ 1.00mg/1; the calibration curve has negative deviation and the correlative coefficient was <0.999 when the concentration range of residual chlorine was >1.00mg/l.