Determination of Arsenic and Selenium in Water by Electrothermal Atomic Absorption Spectrometry Using W-Ir as Permanent Modifier

Objective To establish a method for the determination of trace arsenic (As) and selenium (Se) in water by electrothermal atomic absorption spectrometry (ETAAS) using W-Ir as the permanent modifier. Methods W-Ir coating on the integrated platform of a transversely heated graphite atomizer (THGA) was used in the determination of arsenic and selenium in water by ETAAS. Results The linear ranges of As and Se were 0-100.0 μg/L (r0.999). The characteristic masses and detection limits achieved were as follows,as for As,21 pg and 0.13 μg/L,as for Se,32 pg and 0.33 μg/L. The recoveries were 96.0%-103.6% for As,98.3%-104.7% for Se and the RSDs were 0.6%-1.7% for As,0.6%-2.8% for Se. Conclusion This method was accurate, simple and sensitive,it is applicable to the determination of trace As and Se in water.