钯涂层石墨炉原子吸收热处理分离测定环境水样中的As^（3＋）／As^（5＋）

PRE-ATOMIZATION OF AS (Ⅲ) AND AS (Ⅴ) BY Pd COATED GRAPHITE FURNACE AND THEIR DETERMINATION IN ENVIRONMENTAL AQUEOUS SAMPLES

本文提出了一种较为简便的测定环境水体中Ａｓ３＋和Ａｓ５＋的方法。在研究了钯涂层石墨管性能的基础上，利用ＡｓＣｌ３的低沸点、高挥发性，在石墨炉升温过程中，使Ａｓ３＋在灰化阶段分离；改变灰化温度可以测定总Ａｓ含量。

A method for pre-atomization of arsenic for speciation by graphite furnace atomic spectrometer is presented. It is based on conversion of trivalent arsenic in solution into lowboiling arsenic trichloride by strong hydrochloric acid. The AsCl3 gas is pre-atomized to lose at a higher ash temperature, and only As5+ is detected. Subsequent detection of total As is achieved at a lower ash temperature. The tolerance towards the interferents of Cu, Fe, Co,Sb, Te, Bi and are studied.