Cloud point extraction-thermospray flame quartz furnace atomic absorption spectrometry for determination of ultratrace cadmium in water and urine

摘要

A simple,low cost and highly sensitive method based on cloud point extraction (CPE) for separation/preconcentration and thermospray flame quartz furnace atomic absorption spectrometry was proposed for the determination of ultratrace cadmium in water and urine samples.The analytical procedure involved the formation of analyte-entrapped surfactant micelles by mixing the analyte solution with an ammonium pyrrolidinedithiocarbamate (APDC) solution and a Triton X-114 solution.When the temperature of the system was higher than the cloud point of Triton X-114,the complex of cadmium-PDC entered the surfactant-rich phase and thus separation of the analyte from the matrix was achieved.Under optimal chemical and instrumental conditions,the limit of detection was 0.04 mu g/L for cadmium with a sample volume of 10 mL.The analytical results of cadmium in water and urine samples agreed well with those by ICP-MS.