- 作者: 黃榮茂; 魏錦秋; 陳英茂
- 作者服務機構: Department of Chemistry, National Taiwan University, Taipei, Taiwan, R.O.C.
- 中文摘要:
A method is developed for the determination of trace amounts of selenium by flow injection analysis based on the catalytic effect of this element. Catalytic enhancement by selenium for the reduction of picrate ion by sodium sulfide was used and photometrically measured at the wavelength, 470nm. Optimum conditions were determined for temperature, pH, the concentrations of picrate and sodium sulfide, and also the conditions of the flow system: injection of sample volume, flow rate and mixing coil length.
With these conditions a good linear relationship was obtained for selenium in the range from 0.1ppm to 1.0ppm and the detection limit was about 5ppb (two times of the noise). Interference by the diverse ions can be avoided with the use of a precolumn cation excharger (Dowex 50) and by masking with EDTA in the conditional stream. - 英文摘要: --
- 中文關鍵字: Flow injection analysis; catalytic photometric determination; selenium.
- 英文關鍵字: Flow injection analysis; catalytic photometric determination; selenium.