Determination of HgII Ion with a 1,11-Bis(8-quinoyloxy)-3,6,9-trioxaundecane-Modified Glassy Carbon Electrode Using Spin-Coating Technique

A glassy carbon electrode modified with an open-chain crown ether, 1,11-bis(8-quinolyloxy)-3,6,9-trioxaundecane (BQT), using a spin coating method, has been applied for the highly selective and sensitive analysis of trace amounts of HgII. The modified electrode HgII ion was spontaneously deposited on the modified electrode and the resulting surfaces were characterized by anodic stripping voltammetry. The linear sweep voltammogram of the modified electrode deposited with HgII ion shows a well-defined anodic peak at +0.17 V. The detection limit with linear sweep voltammetry was 1.0 × 10−8 M and was about 7.0 × 10−10 M HgII by differential pulse anodic voltammetry. The response reproduced with a value of 6.1 % relative standard deviation. The presence of 20-fold molar AgI, CdII, PbII, FeII, NiII, CoII, CuII, AlIII, MgII, SbIII, TiII, and ZnII did not interfere in the analysis of HgII ion except FeII. The electrode has been successfully applied to the determination of trace amounts of the HgII ion in the human urine sample.