Abstract
An on-line nano-TiO2 controlled volatilization system was developed for inorganic selenium speciation based on the irradiation of thiourea with ultraviolet light. It provides an effective hyphenation unit for atomic fluorescence spectrometry. The effects of several factors such as the acidity, the concentration of thiourea, the amounts of TiO2, the concentration of KBH4 and the flow rates of carrier gas were investigated. Under optimal conditions, the limit detections for Se(IV) and Se(VI) were 2.38 and 3.39 ng mL−1 (100 µL injection, 3 times of the baseline noise), respectively. The relative standard for deviations of 50 ng mL−1 Se(IV) and Se(VI) were 3.7% and 2.7%, respectively. The method has been applied for determination of inorganic selenium species in real samples and the recoveries were between 93% and 98%.
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