Abstract

We reported a tin film CMK-3 modified carbon paste electrode (Sn–CMK-3/CPE), a brand new electrode combining the ordered mesoporous carbons (OMCs) and tin film to detect trace cadmium. As one of the OMCs, CMK-3 has the distinct advantage of conducting electrons quickly and good adsorptivity because the pores in it are regularly ordered and controllable with the pore diameters of about 3.8–4.0 nm. Compared to the carbon paste electrode modified by CMK-3 and carbon paste electrode modified by the tin film, the Sn–CMK-3/CPE has higher sensitivity and stability in the process of detecting Cd(II). Under the optimum conditions (mass of CMK-3—4.0 mg; pH 4.70, Sn(II) concentration—6.5 mg/L, deposition potential—1.2 V, deposition time – 300 s), the Sn–CMK-3/CPE indicated a wide linear concentration range of 6–100 μg/L with the detection limit of 0.8 μg/L for Cd(II). This novel sensor was applied to the detection of Cd(II) in river samples with good recoveries.

中文翻译：

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锡膜CMK-3修饰碳糊电极作为检测痕量镉的环保传感器

摘要

我们报道了一种锡膜CMK-3改性碳糊电极（Sn – CMK-3 / CPE），这是一种结合有序介孔碳（OMC）的全新电极）和锡膜以检测痕量镉。作为OMC之一，CMK-3具有快速传导电子和良好的吸附性的显着优势，因为其中的孔规则有序且可控制，孔径约为3.8-4.0 nm。与CMK-3修饰的碳糊电极和锡膜修饰的碳糊电极相比，Sn–CMK-3 / CPE在检测Cd（II）的过程中具有更高的灵敏度和稳定性。在最佳条件下（质量为CMK-3–4.0 mg； pH为4.70，Sn（II）浓度为–6.5 mg / L，沉积电势为1.2 V，沉积时间为300 s），Sn–CMK-3 / CPE指示为Cd（II）的线性浓度范围很宽，为6–100μg/ L，检出限为0.8μg/ L。该新型传感器用于回收率良好的河流样品中镉（II）的检测。