Determination of thallium content in solid waste by graphite furnace atomic absorption spectrometry
By optimizing the analytical conditions of matrix improver,ashing temperature and atomization temperature,the influence of the use times of graphite tube on the determination results was studied,and a method for the determination of thallium in solid waste by graphite furnace atomic absorption spectrophotometry was established.The results show that palladium nitrate+ascorbic acid composite matrix modifier is the optimal matrix modifier.The optimum analytical performance of thallium in solid waste can be achieved by using the composite matrix modifier at 600℃ashing temperature and 2100℃atomization temperature.Under optimized conditions,the detection limit of the method was 1.67μg/L.The measured mean value of solid waste standard material RMU026a is within the range of standard value.The relative standard deviation of the determination results of solid waste reference materials and actual samples of solid waste ranges from 5.8％to 14.75％.Both precision and accuracy meet the requirements of laboratory analysis.
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维普
