石墨炉原子化器中原子化过程的研究(Ⅴ)——高氯酸对锂和锗的干扰  

The Study of Atomization Process in Graphite Furnace Atomizer(Ⅴ)--Influence of Perchloric Acid on Absorption Signal of Lithium and Germanium in Graphite Furnace

作　　者：郑衍生[1] 张大雷[1] Zheng Yansheng;Zhang Dalei(Department of Chemistry,Jilin University,Changchun)

机构地区：[1]吉林大学化学系

出　　处：《高等学校化学学报》1988年第12期1222-1226,共5页Chemical Journal of Chinese Universities

摘　　要：本文详细地研究了HClO_(4)对Li和Ge的干扰.HClO_(4)对Li原子吸收信号有明显的抑制作用,干扰的主要原因是气相中形成LiCl。当预加热温度达2000℃时,残留HClO_(4)干扰可消除。在HClO_(4)分解之前加入NH_(4)NO_(3),可消除其干扰。HClO_(4)对Ge有增感作用,并与灰化温度有密切关系。500℃以前HClO_(4)增感效应随温度升高变化较小,高于500℃增感效应明显增加。In this paper the influence of perchloric acid on absorption signal of lithium and germanium in graphite furnace was studied in detail. It was found that a suppression effect of perchloric acid on absorption signal of lithium wasShown.The suppression efiect is due to the formation of Lid originating from ther vapor phase reaction. The interference of .residual peichloric acid is eliminated at temperature of thermal pretreatment higher than 2000℃. The interference of perch-loric acid can be removed by adding NH_(4)NO_(3) rrior to the decomposition of perchloric acid. The influence of perchloric acid on absorption signal of germaniumis closely related to ash temperature. The enhancement effect of perchloric acid is slowly increased with the raise of the temperature prior to 500℃, but obviously increases at temperatures higher than 500℃. The mechanism of interference is discussed as well.

关 键 词：石墨炉原子化器 锂锗 高氯酸干扰 

分 类 号：O65[理学—分析化学]