GFAAS Determination of Trace Amount of Antimony in Food Packing Material with Cloud Point Extraction

Trace amount of Sb (Ⅲ) was separated and enriched from the sample solution buffered at pH 5 with acetate buffer in the form of a coordination complex with APDC by cloud point extraction using Triton X-114 as surfactant.An aliquot of the surfactant phase was taken and dissolved in 0.1 mol·L-1 nitric acid-methanol solution and its antimony content was determined by GF-AAS.Factors influential to cloud point extraction,and interferences of co-existing ions were studied and optimized.Detection limit (3σ/k) of the method was found to be 0.37 μg·L-1.Value of recovery of 99.3% was obtained by the recovery test with standard addition method.