Objective To study the determination of mercury and arsenic content in soil by microwave digestion/atomic fluorescence method. Methods In this study, microwave digestion was used as the pretreatment, by optimizing the digestion temperature, digestion solution dosage and other parameters, digested with aqua regia (a mixture of hydrochloric acid and nitric acid), and the contents of mercury and arsenic in the samples were determined by atomic fluorescence. Results The results showed that the correlation coefficients of the standard curves of mercury and arsenic were 0.9996 and 0.9999, and the detection limits of the method were 0.0011 mg/kg and${0.0096}\mathrm{{mg}}/\mathrm{{kg}}$, respectively. The relative standard deviation of parallel experiments was${1.3}\%\sim {8.7}\%$, all of which were within 10%. The recoveries were 91.2%~117.4% and 86.0%~98.0%, respectively. The measured values of the certified reference materials are all within the theoretical range. Conclusion By optimizing digestion temperature, digestion solution dosage and other parameters, the method is accurate, simple, reliable and has good practicability.

mercury  /  arsenic  /  soil  /  microwave digestion  /  atomic fluorescence