THE DETERMINATION OF ANTIMONY(III) AND ANTOMONY(V) IN GEOLOGICAL SAMPLES BY HYDRIDE GENERATION-ATOMIC FLUORESCENCE SPECTROMETRY

A method for the determination of antimony(Ⅲ) and antimony(Ⅴ) in geological samples(stream sediments) by hydride generation-atomic fluorescence spectrometry was developed in the paper.4.8 mol/L HCl could be used as the extractant with ultrasonic-assisted extraction.In the medium of 0.24 mol/L hydrochloric acid,antimony(Ⅲ) could be alternatively determined with 6 g/mL sodium citrate as the masking agent for Sb(V).Then antimony(Ⅴ) could be figured out by the subtraction method.The detection limit of the method was 0.075×10-6 for Sb(Ⅲ) and 0.097×10-6 for Sb(Ⅴ),and the relative standard deviation was 1.1% and 0.64%(n=11) for 40 ng/mL Sb(Ⅲ) and 40 ng/mL Sb(Ⅴ) standard solution.The proposed method was applied to the determination of antimony(Ⅲ) and antimony(Ⅴ) in geological samples,and a comparison between the extraction results and the aqua regia dissolution results shows that the extraction rate of antimony was higher than 80%,the recoveries were in the ranges of 83%～107% and 98%～114% for Sb(Ⅲ) and Sb(V) respectively.