Determination of Cadmium in Paper by Microwave Ashing and Flame Atomic Absorption Spectrometry

The cadmium in paper was determined by microwave ashing and flame atomic absorption spectrometry.The paper was ashed with microwave.The ashes were dissolved with hydrochloric acid and the cadmium was determined by flame atomic absorption spectrometry.Under the proposed conditions,there was a linear relationship with cadmium within the range of 1.0 μg/L to 250 μg/L.The detection limit reached 0.2 μg/L.The average recovery rate was 97.9%-102.8%.The relative standard derivation of overall intra-day variation was 1.8%,and the relative standard derivation of inter-day variation was 2.3%.This method was simple,sensitivity and accurate,which was applied to the determination of cadmium in paper with good results.