Determination of trace cadmium in seawater by ultrasound-assisted liquid extraction with inductively coupled plasma mass spectrometry measurement
A new method based on ultrasound assisted liquid-phase extraction(UALPE)was developed using inductively coupled plasma mass spectrometry(ICP MS)for cadmium analysis in seawater samples.The chelate formed by cadmium and ammonium pyrrolidine dithiocarbamate(APDC)was extracted by carbon tetrachloride under ultrasound irradiation.The extraction phase was heated to near dry.Then 20%HNO3(v/v)and 60%H2O2(v/v)were added to digest the organic compounds in the extraction phase for 5 min,after which deionized water(DIW)was added to dilute samples to the mark.The influencing factors of extraction and the potential interferences from co-existing ions were investigated.Under the selected conditions,the detection limit of the method was found to be 6.4 ng·L-1.The method was applied for the determination of trace Cd in seawater samples with recoveries above 90%.Compared with traditional analytical methods,this method has the advantages of simple operation and low cost.Also,the effect of organic compounds in traditional liquid-liquid extraction on the analyte determination was eliminated.The method can also be applied for analysis of other heavy metal elements as well.
ultrasound assisted liquid extractioninductively coupled plasma mass spectrometryseawatercadmium
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