Abstract:At present, the pretreatment of Marine sediments is mainly processed by electric heating plate digestion, but this method has some problems, such as incomplete digestion, long pretreatment time, poor repeatability and tedious manual digestion operation.??In order to improve the efficiency of heavy metal digestion in Marine sediments, the optimal digestion conditions were determined by investigating the effects of the ratio of nitric acid, hydrochloric acid, hydrofluoric acid and perchloric acid combined acid system and the maximum digestion temperature on the pretreatment of Marine sediments, and a method for the determination of heavy metals in Marine sediments by automatic digestion and inductively coupled plasma mass spectrometer was established.??The results showed that the higher the proportion of nitric acid, the better the digestion effect of each element, and the dosage of hydrochloric acid should not be too much.??The optimal pretreatment conditions were 9 mL nitric acid, 3 mL hydrochloric acid, 4 mL hydrofluoric acid and 2 mL perchloric acid digestion at 160℃.??The correlation coefficients of each element under the pretreatment conditions were greater than 0.999. After the application of Marine sediment standard sample (GBW07314) and actual sample, compared with the national standard method (GB/T 20260-2006), the precision and accuracy of each element under the optimized conditions were significantly improved and the detection limit was lower.??The relative standard deviations of each element were 0.9%~3.3% and 0.5%~3.4%, respectively, and the recoveries were 84.2%~102%.??The method is of high automation and simple operation, which can realize mass sample pretreatment and is suitable for the determination of heavy metal elements in Marine sediments.