Determination of Cadmium in Environmental Sample by Electrochemical Hydride Generation Electrothermal Atomic Absorption with in Situ Trapping in Graphite Tube Atomizer
نویسنده
چکیده
A homemade batch electrolytic cell with a Sn-Pb alloy cathode used to generate cadmium hydride. Several parameters influencing the electrochemical hydride generation and trapping on the coated graphite tubes, and atomization process have been investigated. Ir-, W-, and Zrcoated graphite tubes were used for trapping cadmium hydride. It was found that Ir-coated graphite provided the best sensitivity of the determination. Thus, this coating was used to trap cadmium hydride prior to atomization. Potential interferences from several ions were studied. Under the optimum conditions the calibration plot calibration curve was linear over the range of 0.5-5 ng L -1 with a detection limit of 0.05 ng L -1 which was determined by dividing 3σ by the slope of the calibration curve and RSD 5.5 % (n = 5) for 2ng L -1 Cd (II) . In order to evaluate the accuracy and recovery of the presented method, the procedure was applied to the analysis of reference materials and river and tap water sample. Keyword: cadmium in environmental sample, Electrochemical Hydride Generation, Electrothermal Atomic Absorption *Corresponding author [email protected]: [email protected]
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