Fan Hongtao, Bian Yuqian, Sui Dianpeng, Tong Guifeng, Sun Ting
Department of Chemistry, Northeastern University, Shenyang 110004, China.
Anal Sci. 2009 Nov;25(11):1345-9. doi: 10.2116/analsci.25.1345.
A technique for the selective measurement of diffusive gradients in thin-films (DGT) for free Cu2+ ions was developed using a 0.030 M solution of polyvinyl alcohol (PVA) as the liquid binding phase with the liquid-type DGT devices (PVA DGT). The PVA DGT had a substantial binding capacity at pH 5.6 - 8.6 and concentrations of competitive Na+ up to 0.7 M. The measurements of PVA DGT and cupric ion selective electrode (Cu-ISE) for free Cu2+ in synthetic river water (recovery = 97.51 +/- 2.58% for PVA DGT and recovery = 98.25 +/- 1.46% for Cu-ISE), in spiked river water (recovery = 24.99 +/- 3.55% for PVA DGT and recovery = 26.32 +/- 3.33% for Cu-ISE) and in spiked industrial wastewater (recovery = 4.21 +/- 3.13% for PVA DGT and recovery = 5.10 +/- 2.78% for Cu-ISE) were equivalent. The results showed that PVA DGT could measure selectively the free Cu2+ ion concentrations in water samples.
开发了一种用于选择性测量薄膜中自由Cu2+离子扩散梯度（DGT）的技术，该技术使用0.030 M的聚乙烯醇（PVA）溶液作为液体结合相，并结合液体型DGT装置（PVA DGT）。PVA DGT在pH值为5.6 - 8.6以及竞争性Na+浓度高达0.7 M时具有相当大的结合能力。在合成河水中，PVA DGT和铜离子选择性电极（Cu-ISE）对自由Cu2+的测量结果（PVA DGT的回收率为97.51 +/- 2.58%，Cu-ISE的回收率为98.25 +/- 1.46%）、加标河水中（PVA DGT的回收率为24.99 +/- 3.55%，Cu-ISE的回收率为26.32 +/- 3.33%）以及加标工业废水中（PVA DGT的回收率为4.21 +/- 3.13%，Cu-ISE 的回收率为5.10 +/- 2.78%）相当。结果表明，PVA DGT能够选择性地测量水样中自由Cu2+离子的浓度。
