氯化金与氯铂酸铵在石墨炉内石墨探针表面原子化机理的研究

Studies on Atomization Mechanism ofGold Chloride and Ammonium Chloroplati-nate on Graphite Probe Surface in GraphiteFurnace

用Ｘ－射线衍射方法研究了氯化金与氯铂酸铵在石墨炉内石墨探针表面上的原子化机理。研究结果表明，ＡｕＣｌ＿３和（ＮＨ＿４）＿２ＰｔＣｌ＿６都是先热分解为金属单质，后者蒸发进入气相。ＡｕＣｌ＿３和（ＮＨ＿４）ＰｔＣｌ＿６的原子化都起源于金属单质的直接热蒸发。

n this paper,atomization mechanism ofgold chloride and ammonium chloroplatinateon graphite probe surface in graphite furnacewas investigated experimentally by X- raydiffraction spectrometry.It is shown that inthe course of atomization,AuCl_3 and(NH_4)_2PtCl_5 on the probesurface firstly de-composed into Au(s) and Pt(s )respectivelyand then they vaporize into gaseous phase asAu(g)and Pt(g).The atomization of AuCl_3and(NH_4 )_2PtCl_5 originates from the directthermal vaporization of their metalic ele-ments.