Determination of trace mercury in hawthorn leaf by new cold mercury generation- atomic absorption spectrometry with microwave digestion

Objective To establish a method for determination of trace mercury in hawthorn leaf by new cold mercury generation- atomic absorption spectrometry with microwave digestion. Methods After pretreatment by microwave digestion system,trace mercury in several common Chinese herbal medicine were determined by cold mercury generation- atomic absorption spectrometry. Results When using the nitric acid + hydrofluoric acid peroxide reagent at the ratio of 8: 1 as acid digestion reagent in the digestion process,the samples will be completely digested Wide linear relationship was achieved in the range of 10μg / L ~ 50μg / L with relative coefficient of 0. 9999 and the detection limit was 0. 041μg / g with RSD of 2. 24% formercury at 30μg / L. With respect to the average recovery was 99. 2%,relative standard deviation was 2. 12%,RSD% accuracy is good. Conclusion The method determination of trace mercury in hawthorn leaves is safe environmental protection,simple and fast,accurate,sensitive and has a good application prospect.