Trace arsenic in naphtha was directly determined by graphite furnace atomic absorption spectrometry using tetrahydrofuran(THF)as organic solvent to dilute the sample and nickel nitrate Ni(NO3)2 as a matrix modifier.The recovery rate for directly determining arsenic content in naphtha at 0.5-100.0 μg/kg using the standard curve method is(100±5)％,When the arsenic content is be-tween 2-10 μg/kg,the coefficient of variation is less than 5％.The standard working curve of arse-nic shows good linearity with a correlation coefficient of 0.999 2,and can accurately and rapidly deter-mine trace arsenic in naphtha.
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