Voltametri Pelucutan Anodik Menggunakan Elektroda Pasta Karbon Termodifikasi Bentonit untuk Penentuan Kadar Ion Cd(II) dalam Sayur Sawi Putih

Irdhawati Irdhawati, Ni Kadak Nevi Titasia, E. Sahara
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Abstract

In this study, the measurement of Cd(II) ion by anodic stripping voltammetry technique was conducted using bentonite modified carbon paste as working electrode (CPE-B). The performance of CPE-B was compared with carbon paste electrode without bentonite (CPE) and applied for determination of Cd(II) concentration in chicory. Optimized parameters were composition of bentonite in carbon paste electrode, deposition time, deposition potential, and scan rate. Validation of measurements was observed including determination of linear concentration range, detection and quantization limits, repeatability of measurement, and percentage of recovery. The optimum composition of bentonite in CPE-B was found at 50%. Furthermore, in the optimization of measurements condition was found the optimum deposition times were 90 and 60 s, deposition potentials were -0.63 and -0.53 V, and scan rates were 15 and 20 mV/s, for CPE and CPE-B. The linear range concentration for CPE observed at 25-2000 µg/L and CPE-B was 5-50 µg/L. Limit of detection and quantization using CPE-B were 0.337 µg/L and 0.349 µg/L, lower than CPE i.e., 0.470 µg/L and 0.471 µg/L, respectively. Repeatability measurement of Cd(II) had Horwitz Ratio value less than two, and percentage of recovery was 96.73 8.33%. The level of Cd(II) ion in chicory was found at 6.98 0.40 mg/kg.
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膨润土修饰碳糊电极阳极污染电压计测定白天鹅中Cd(II)离子速率
本研究以膨润土改性碳糊为工作电极(CPE-B),采用阳极溶出伏安法测定了Cd(II)离子。将CPE-B与不含膨润土的碳糊电极的性能进行了比较,并应用于菊苣中Cd(II)浓度的测定。优化参数为碳糊电极中膨润土的组成、沉积时间、沉积电位和扫描速率。观察到测量的有效性,包括线性浓度范围的测定、检测和量化限、测量的可重复性和回收率。CPE-B中膨润土的最佳组成为50%。此外,在测量条件的优化中,发现CPE和CPE-B的最佳沉积时间为90和60s,沉积电位为-0.63和-0.53V,扫描速率为15和20mV/s。在25-2000µg/L和CPE-B下观察到的CPE的线性范围浓度为5-50µg/L。CPE-B的检测限和定量限分别为0.337µg/L和0.349µg/L,低于CPE,即分别为0.470µg/L和0.471µg/L。Cd(II)重复性测定的Horwitz比值小于2,回收率为96.73 8.33%,菊苣中Cd(II的含量为6.98 0.40 mg/kg。
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