Department of Chemistry, Nankai University, Tianjin 300071, People's Republic of China; Department of Chemistry, Hubei Normal University, Huangshi 435002, People's Republic of China.
Talanta. 2003 Mar 1;59(3):553-60. doi: 10.1016/s0039-9140(02)00569-6.
A novel calix[4]arene derivative containing benzothiazole group was coated on glassy carbon electrode (GCE) and then applied to the recognition of mercury ion. Cyclic and square wave voltammetric results showed that the modified electrode selectively recognizes Hg(2+) ion in aqueous media. A new anodic stripping peak at -0.3 V (vs. Ag/Ag(+)) can be obtained by scanning the potential from -0.6 to 0.6 V, and the peak currents are proportional to the Hg(2+) concentration. The modified electrode in a 0.1 M H(2)SO(4)+0.01 M NaCl solution shows linear voltammetric response in the range of 25-300 mug l(-1) and detection limit of 5 mug l(-1) (ca. 2.5x10(-8) M). This modified GCE does not present any significant interference from alkali, alkaline and transition metal ions except for Pb(2+), Ag(+) and Cu(2+) ions. Only 500, 50 and 100-fold molar excess of Pb(2+), Ag(+) and Cu(2+) ions, respectively, can lead to voltammetric response comparable with that of Hg(2+). The proposed method was successfully applied to determine mercury in natural water.
一种新型含苯并噻唑基团的杯[4]芳烃衍生物被涂覆在玻碳电极（GCE）上，然后用于识别汞离子。循环伏安法和方波伏安法的结果表明，修饰电极在水相中对 Hg(2+)离子具有选择性识别能力。通过从-0.6 到 0.6 V 扫描电势，可以得到一个新的在-0.3 V（相对于 Ag/Ag(+)）处的阳极溶出峰，并且峰电流与 Hg(2+)浓度成正比。在 0.1 M H(2)SO(4)+0.01 M NaCl 溶液中的修饰电极在 25-300 μg l(-1)的范围内呈现线性伏安响应，检测限为 5 μg l(-1)（约为 2.5x10(-8) M）。这种修饰后的 GCE 除了 Pb(2+)、Ag(+)和 Cu(2+)离子外，对碱金属、碱性金属和过渡金属离子没有明显的干扰。只有 500、50 和 100 倍摩尔过量的 Pb(2+)、Ag(+)和 Cu(2+)离子分别会导致与 Hg(2+)相当的伏安响应。该方法成功地应用于测定天然水中的汞。
