Abstract：The free cadmium ion in water was measured by using sodium polyacrylate (PAAS) as binding phase in the diffusive gradients in thin-films (DGT) device(PAAS DGT device). Multiple problems were discussed, such as the effect of DGT, the saturated cumulative capacity of PAAS DGT device, the pH value of bulk solution and the effect of ion intensity on the cumulation of Cd2+ in PAAS DGT device. The saturated cumulative capacity of PAAS DGT device were 278.88 mg/mL. The cumulation capacity of PAAS DGT device for Cd2+ was not affected when the bulk solution was at pH 4-10 and ion intensity was from 0.000 1 mol/L to 0.1 mol/L. The linear correlation coefficient (r) of cumulated mass of Cd2+ in synthetic water with time was 0999 6 with the recovery of 99.25 % and the relative standard deviation (RSD) of 1.96 %. It was proved that PAAS DGT device could be applied to the determination of free Cd2+ ion in combination with flame atomic absorption spectrometry. The results were consistent with those by Cd ion selective electrode (Cd ISE), and the detection concentration was even lower.
陈宏;邸万山;赵晋;董佳;孙挺. 应用聚丙烯酸钠为结合相的薄膜扩散梯度技术测定水中Cd2+[J]. 冶金分析, 2011, 31(2): 15-19.
CHEN Hong;DI Wan shan;ZHAO Jin;et al.. Application of sodium polyacrylate as a binding phase in diffusive gradients in thin films for the measurement of Cd2+ in waters. , 2011, 31(2): 15-19.
