Analytical Sciences

Room-temperature Chelate Vapor Generation of Lead Using Ammonium O,O-Diethyl Dithiophosphate as a Chelating Reagent and Determination by Atomic Fluorescence Spectrometry in Environmental Water Samples

Shuai LIU,* Jinsheng SUN,* Jianzhong HUO,** Xuchuan DUAN,* and Yue LIU**

*College of Life Sciences, Tianjin Key Laboratory of Animal and Plant Resistance, Tianjin Normal University, Tianjin 300387, China
**Key Laboratory of Inorganic-Organic Hybrid Functional Materials Chemistry (Tianjin Normal University), Ministry of Education, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, Tianjin 300387, China

A novel gas-liquid separator (GLS) system for chelate vapor generation (Che-VG) combined with AFS was developed for the determination of trace Pb. It was shown that Pb can form a volatile chelate by mixing of Pb with ammonium O,O-diethyldithiophosphate (DEDTP) in various aqueous solutions. Under the optimal conditions (frit pores of the GLS, 5 – 15 μm; solution pH, 6.7; DEDTP concentration, 0.4%; flow rate of the two feed solutions in the on-line mode, 1.2 mL min⁻¹; and carrier gas flow rate, 150 mL min⁻¹), the calibration curve was linear up to 100 ng mL⁻¹ Pb. The limit of detection (LOD) was 1.1 ng mL⁻¹. The relative standard deviation was 5.6% for eleven replicate determinations of 10 ng mL⁻¹ Pb. The efficiency of Che-VG was estimated to be 12%, and the volatile Pb species was preliminarily studied by ICP-OES. This method was applied to determine trace Pb in water samples.

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