摘要
Conducting anodic stripping voltammetry (ASV) to determine non-labile-form metal in a water sample usually requires UV digestion. The time for thoroughly disintegrating metal complexes is lengthy and completion of digestion is not easy to determine. In this study, the degree of dissociation of copper complex, indicated by the ratio of slope changes at ASV titration, was found to be linearly correlated with UV irradiation time (r 2 = 0.976). Using slope changes, an equation for estimating the length of UV irradiation time was developed. If the estimated UV digestion time was too long, the same data set could be used to estimate the total concentration of the element using another equation developed from the linear correlation (r 2 = 0.990) between the concentration of labile form metal ion and UV irradiation time. The reliability and feasibility of this method were confirmed with standard addition (error < 20%; recovery: 97.5 ± 10.9%).
Conducting anodic stripping voltammetry （ASV） to determine non-labile-form metal in a water sample usually requires UV digestion. The time for thoroughly disintegrating metal complexes is lengthy and completion of digestion is not easy to determine. In this study, the degree of dissociation of copper complex, indicated by the ratio of slope changes at ASV titration, was found to be linearly correlated with UV irradiation time （r^2 = 0.976）. Using slope changes, an equation for estimating the length of UV irradiation time was developed. If the estimated UV digestion time was too long, the same data set could be used to estimate the total concentration of the element using another equation developed from the linear correlation （r ^2 = 0.990） between the concen- tration of labile form metal ion and UV irradiation time. The reliability and feasibility of this method were confirmed with stan- dard addition （error 〈 20%; recovery： 97.5 ± 10.9%）.
基金
supported by "National Science Council" (Grant No.NSC90-2313-B-291-001)
