摘要
氢化物发生-原子荧光光谱法是近年推广完善的,本文尝试用该法测定土壤中镉,试验了常用酸及还原剂用量对测定镉的影响,优选了仪器工作条件,探讨了土壤中共存元素对测定镉的影响,确立了土壤中镉的分析方法,测定了土壤标准样品。结果表明,镉发生氢化物反应需弱酸性条件,酸度范围窄;2.0％(?)盐酸作载流,硼氢化钾还原剂浓度为20.0 g·L-1、载气流量为800-1 000 mL·min-1,主阴极灯电流为60-90 mA,原子化器温度为低温和原子化器高度为7mm时,荧光强度较大且稳定;加入适当试剂能降低土壤中共存元素对测定镉的影响;土壤标样的分析结果与保证值基本吻合,相对标准偏差(n=10)小于10％,用氢化物发生-原子荧光光谱法测定土壤中镉具有较好灵敏度、精密度和准确度。
The determination of Cd in soil by hydride generation atomic fluorescence spectrometry has been done. The effects of acids and reducer concentration on the determination of Cd have been studied, the instrument working conditions have been selected and optimized, the effects of the coexisting elements in soil on the determination of Cd have been studied, the analytical method of Cd in soil has been set up, and the soil standard samples have been analyzed. The results have shown that the Cd hydride generation happens with weak acidity, the range of which is narrow; the reducer concentration heavily affects the fluorescence signal; the fluorescence signal is bigger and more stable at the hydrochloric acid concentration of 2.0 % (phi), the reducer concentration of 20.0 g(.)L(-1), the carrier gas flow of 800-1 000 mL(.)min(-1), the main cathode lamp current of 60-90 mA, and with the atomizer temperature being lower and with the atomizer height of the 7 nun. The effects of the coexisting elements in soil on the determination of Cd can be reduced if certain agents are added. The analytical results are within the standard values. The coefficient of variation(n = 10) is less than 10 %. The analytical method is very sensitive and accurate.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2003年第5期990-992,共3页
Spectroscopy and Spectral Analysis
