流动注射－氢化物原子吸收法测定轻油中的砷

用Ｈ＿２ＳＯ＿４／Ｈ＿２Ｏ＿２提取轻油中的砷，碘化钾加抗坏血酸做预还原剂，硼氢化钠做还原剂，流动注射法发生Ｈ＿３Ａ＿ｓ并用Ｎ＿２载入电热石英原子化器中进行原子化，在２４０ｈ￣（－１）的采样频率下，砷（Ａｓ）的特征浓度为０．２ｎｇ／ｍｌ，检测限（３σ）为０．６５ｎｇ／ｍｌ。用于重整原料油、石脑油和柴油中砷的测定，与标准方法所得结果一致。

Determination of Arsenic in Light Oils by Flow Injection-Hydride Generation-Atomic Absorption Spectrometry

Arsenic in light oil was extracted and drgested with H_2SO_4/H_2O_2 to get an inorganic speciesof arsenic(V)which was then reduced to arsenic(Ⅲ)with potassium iodide and ascorbic acid.Aflow injection system was then employed to generate arsine with sodium hydroborate as reducingagent. The arsine was carried into an electrically heated quartz tube atomizer with a nitrogen flowwhere it was atomized. With a sampling frequency of 240h￣(-1),a characteristic concentration of0.2ng.ml￣(-1) and a detection limit(3σ)of 0.65ng·ml￣(-1) were achieved. The method has been suc-cessfully applied to the analysis of arsenic in raw material oil of reforming process, naphtha anddiesel oil with R.S.D.of smaller than 6.5%,and the results agree with that obtained by the stan-dard method.