HG-AFS Determination of Selenium in Yantao with Ultrasonic Assisted Sample Digestion

As a modification for method of sample pretreatment of the standard (GB/T 5009.93-2003),ultrasonic treatment for 20 min was adopted in the sample digestion of yangtao with the mixed acid of HNO3 and HClO4(2+3). The content of selenium was then determined by HG-AFS same as described in the standard. Detection limit (3s/k) was founed to be 0.01 μg·L-1. The proposed method was applied to the analysis of a yangto sample for 5 replicate determinations,giving value of RSD (n=11) 4.6%. The results obtained were in consistency with those obtained by GB standard method.