[Determination of trace mercury in rice by microwave digestion-hydride generation-atomic fluorescence spectrometry]

It was reported in this paper that trace mercury in rice was determined by microwave digestion-hydride generation-atomic fluorescence spectrometry. The microwave digestion of samples was used, and the optimum conditions for the digestion were developed. The relative factors of hydride generation atomic fluorescence spectrometry for the determination were tested and discussed. The temperature and the relative humidity were discussed too. The detection limit was 0.005 ng x mL(-1). Mercury in reference materials (rice flour, GBW 08508) was determined also by the described method. The result obtained was in good agreement with standard value. The relative standard deviation (RSD) was 2.1%, and the recovery of mercury in rice samples was 95.2%-106.4%.