石墨炉原子吸收法中磷酸二氢铵对镉灰化及原子化行为的影响

Effect of NH_4H_2PO_4 on The Ashing and Atomization of Cd in GFAAS

石墨炉原子吸收法中磷酸二氢铵对镉灰化及原子化行为的影响戴青山，姚金玉，谢文兵，王国平（中国科学院长春应用化学研究所长春１３００２２）关键词石墨炉原子吸收法，动力学模型，Ａｒｒｈｅｎｉｕｓ图镉是易挥发性元素，在石墨炉原子吸收法中，灰化温度为３００℃左右...

A kinetic approach and other informations were employed to study the mechanism of Cd ashing and atomization when NH_4H_2PO_4 was used as a modifier. During the pyrolysis stage Cd_x(PO_3)_n produced and a large amount of NH_4H_2PO_4 dehydrated to form metaphosphate with chain or ring shape. This may result in the physical embedment of Cd. So both chemical and physical factors lead to the rise of the pyrolysis temperature. During the atomization stage, the analyte atomization was considered to be governed by the decomposition of this meta phosphate.