- 作者: 黃榮茂; 陳英茂
- 作者服務機構: Department of Chemistry, National Taiwan University, Taipei, Taiwan 107, R.O.C.
- 中文摘要: Speciation of Cr(III) and Cr(VI) can be attained by flow injection analysis with amperometric detection. Cr(VI) is reduced in an acidic medium to Cr(III) with a glassy carbon electrode at -0.1V vs. Ag/AgCl and the current is recorded. Cr(III) is oxidised on-line to Cr(VI) with alkaline hydrogen peroxide solution. From the difference of the total chromium and Cr(VI), the amount of Cr(III) was obtained. A linear calibration curve for Cr(VI) was obtained for the concentration ranges 0.01-5.0ppm of Cr(VI) and we have calculated the limit of determination to be about 0.5ppb. We have studied the degree of reproducibility obtained using the solid electrodes under various conditions. The influence of flow rate, coil length, interferences and the extent of reaction were studied.
- 英文摘要: --
- 中文關鍵字: Flow injection analysis; speciation of Cr(III) and Cr(VI); amperometric detection.
- 英文關鍵字: Flow injection analysis; speciation of Cr(III) and Cr(VI); amperometric detection.