恒温炉中加热管材料对灵敏度的影响

INFLUENCE OF HEATED TUBE MATERIAL IN A CONSTANT-TEMPERATURE FURNACE ATOMICABSORPTION SPECTROSCOPY

恒温炉中加热管石墨表面结构和物理性质,直接影响分析试样的原子化行为。目前,利用热解涂层石墨管改善原子吸收分析灵敏度,已被人们重视并广泛应用。本文采用Woodriff炉做原子化器,对A1、K、Ag、Cd在普通石墨管和玻璃碳管中的原子化行为进行了研究,结果四种元素在玻璃碳管中的灵敏度均获得提高。

In the paper the atomization behaviours of Al,K,Ag and Cd in the ordinary graphite and the glassy carbon tube are studied.The experiment showed that the slopes of calibration curves established for Al,K,Ag and Cd in the glassy carbon tube are larger than those in the graphite tube.Therefore,the analytical sensitivities of the elements are increased by using the glassy carbon as heated tube.The influence of the heated tube material on the shape of the absorption charateristic curve and on trailing phenomena of the signals,occured in the glassy carbon and the graphite tube,are related to the nature of elements.The trailing of signal for Ag and Cd did not appear in two heated tube,But the trailing of the signal for Al and K taked place in two heated tubes.