Baciu Anamaria, Ardelean Magdalena, Pop Aniela, Pode Rodica, Manea Florica
Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, V. Parvan no. 6, Timișoara 300223, Romania.
Sensors (Basel). 2015 Jun 19;15(6):14526-38. doi: 10.3390/s150614526.
This work reported new voltammetric/amperometric-based protocols using a commercial boron-doped diamond (BDD) electrode for simple and fast simultaneous detection of sulfide and nitrite from water. Square-wave voltammetry operated under the optimized working conditions of 0.01 V step potential, 0.5 V modulation amplitude and 10 Hz frequency allowed achieving the best electroanalytical parameters for the simultaneous detection of nitrite and sulfide. For practical in-field detection applications, the multiple-pulsed amperometry technique was operated under optimized conditions, i.e., -0.5 V/SCE for a duration of 0.3 s as conditioning step, +0.85 V/SCE for a duration of 3 s that assure the sulfide oxidation and +1.25 V/SCE for a duration of 0.3 s, where the nitrite oxidation occurred, which allowed the simultaneously detection of sulfide and nitrite without interference between them. Good accuracy was found for this protocol in comparison with standardized methods for each anion. Also, no interference effect was found for the cation and anion species, which are common in the water matrix.
这项工作报道了基于伏安法/安培法的新方案，该方案使用商业硼掺杂金刚石（BDD）电极，用于简单快速地同时检测水中的硫化物和亚硝酸盐。在0.01 V步长电位、0.5 V调制幅度和10 Hz频率的优化工作条件下进行方波伏安法，可实现同时检测亚硝酸盐和硫化物的最佳电分析参数。对于实际现场检测应用，多脉冲安培法技术在优化条件下运行，即作为预处理步骤，在-0.5 V/SCE下持续0.3 s，在+0.85 V/SCE下持续3 s以确保硫化物氧化，在+1.25 V/SCE下持续0.3 s以实现亚硝酸盐氧化，从而能够同时检测硫化物和亚硝酸盐且它们之间无干扰。与每种阴离子的标准方法相比，该方案具有良好的准确性。此外，未发现水基质中常见的阳离子和阴离子物种的干扰效应。
