悬浮体进样石墨炉原子吸收光谱法直接测定煤中微量砷

Direct Determination of Trace Arsenic in Coal by Slurry-SamplingGraphite-Furnace Atomic Absorption Spectrometry

以Pd为基体改进剂 ,建立了浮体制样石墨炉原子吸收光谱法直接测定煤中微量As的方法。研究了悬浮体的稳定性、试样粒度、基体改进剂、灰化温度、原子化温度和常见共存离子等因素对待测物信号强度的影响。在优化实验条件下 ,方法的检出限为 0 0 5 4 μg·g-1,相对标准偏差 (RSD)为 8 9%

A method for direct determination of trace arsenic in coal by slurry-sampling Graphite-Furnace Atomic Absorption Spectrometry (GFAAS) was developed, using Pd as a matrix modifier. The effects of slurry stability, particle size of sample, matrix modifiers, ashing temperature, atomization temperature, and common coexisting components on the signal intensity of arsenic were investigated. Under optimized operating conditions, the detection limits and relative standard deviation of this method were 0.054 mug(.)g(-1) and 8.9%, respectively.