Determination of Cd in soil by hydride generation-atomic fluorescence spectrometry

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.