CAJ | 학술논문

采用三辛胺(TOA)修饰碳糊电极(TOA/CPE)测定了Cr(Ⅵ)含量, 并考察了最佳的实验条件. 当富集时间为10 min, 富集介质为0.15 mol/L H_2SO_4时, TOA/CPE能够有效地富集Cr(Ⅵ). 以溶出伏安法测定Cr(Ⅵ), 在-0.45 V (vs. SCE)处有灵敏的还原峰, 峰电流与Cr(Ⅵ)浓度在5.0×10~(-7)～1.0×10~(-3) mol/L范围内呈现良好的线性关系. 干扰试验显示TOA/CPE对Cr(Ⅵ)具有高选择性, 能够在Cr(Ⅲ)浓度是Cr(Ⅵ) 600倍时准确测定Cr(Ⅵ), 检出限达3.4×10~(-9) mol/L (S/N=3). TOA/CPE测定了实际样品电子引脚中的Cr(Ⅵ), 实验结果与紫外分光光度法结果一致.
채용삼신알(TOA)수식탄호전겁(TOA/CPE)측정료Cr(Ⅵ)함량, 병고찰료최가적실험조건. 당부집시간위10 min, 부집개질위0.15 mol/L H_2SO_4시, TOA/CPE능구유효지부집Cr(Ⅵ). 이용출복안법측정Cr(Ⅵ), 재-0.45 V (vs. SCE)처유령민적환원봉, 봉전류여Cr(Ⅵ)농도재5.0×10~(-7)～1.0×10~(-3) mol/L범위내정현량호적선성관계. 간우시험현시TOA/CPE대Cr(Ⅵ)구유고선택성, 능구재Cr(Ⅲ)농도시Cr(Ⅵ) 600배시준학측정Cr(Ⅵ), 검출한체3.4×10~(-9) mol/L (S/N=3). TOA/CPE측정료실제양품전자인각중적Cr(Ⅵ), 실험결과여자외분광광도법결과일치.
A carbon paste electrode modified by trioctylamine (TOA) was employed to determine Cr(Ⅵ) and the optimum experimental conditions were examined and identified. TOA/CPE can effectively accumulate Cr(Ⅵ) when the accumulation time was 10 min and the acid medium for accumulation was 0.15 mol/L H_2SO_4. A sensitive reduction peak at -0.45 V (vs. SCE) characteristic of trace Cr(Ⅵ) was detected by stripping voltammetry, and the reduction peak current exhibited a good linear response to Cr(Ⅵ) concentration in the range of 5.0×10~(-7)～1.0×10~(-3) mol/L. Interference studies displayed that TOA/CPE had high selectivity for Cr(Ⅵ) and can accurately determine Cr(Ⅵ) in the presence of Cr(Ⅲ) (600-fold concentration), with a low detection limit at 3.4×10~(-9) mol/L (S/N=3). TOA/CPE was utilized to determine Cr(Ⅵ) in real electronic materials, and the experimental results were in good agreement with those by spectrophotometry.