[Study on microwave digestion of sediment of Poyang Lake determined by ICP-AES].

In order to determine the sediment of Poyang Lake correctly, digestion methods for the samples were studied in the present paper. Microwave digestion was used to digest the samples, and ICP-AES was used to determine the samples. Different digestion solutions, the amount of acids, digestion procedure and the amount of sample were investigated and optimized. Finally, an optimal digestion method was established to carry out the further analysis of all sediment samples: weigh up 0. 5 g sample, take a pretreatment by heating on the electric plate for about 15 min at 180 degree C, and add HNO3-HF-HClO4 or HNO3-HF-H2O2 in the proportions of 4 : 4 : 2. The microwave digestion procedure was 5 atm/3 min-10 atm/2 min-15 atm/5 min-20 atm/10 min. This method was simple, fast, effective with low work intensity.