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Determination of total arsenic in soil by gas chromatography after pyrolysis

机译:热解后气相色谱法测定土壤中的砷总砷

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A rapid method for the determination of total arsenic in soil by gas chromatography after pyrolysis is proposed. Arsenic was isolated from the soil sample by pyrolysis and absorbed by the absorption liquid. Additionally, arsenic derivatives from the dimercaprol (BAL)-arsenic reaction were determined by gas chromatography. A pyrolysis system was evaluated for the isolation of micro amounts of arsenic from soil. The optimized parameters for the pyrolysis system are as follows: temperature of the tube furnace, 1000 degrees C; thermal decomposition time, 35 min; carrier gas flow rate, 0.1 L.min(-1); concentration of sodium hydroxide (NaOH) in absorption liquid, 0.8 mol.L-1; volume of absorption liquid, 20 mL. The limit of detection (3 sigma, n = 20) for arsenic in soil was found to be 0.15 mu g.g(-1), as determined using this pyrolysis method. The results obtained using this method for the standard soil samples (GBW07425 and GBW07454) are consistent with the certified values of these 2 aforementioned standard samples. The method was successfully applied to determine the total arsenic in some actual soil samples.
机译:提出了一种快速测定热解后气相色谱法测定土壤中的总砷。通过热解溶解并被吸收液吸收,从土壤样品中分离砷。另外,通过气相色谱法测定来自DiMercaprol(BAL)的砷衍生物的砷。评价热解系统以分离来自土壤的微量砷。热解系统的优化参数如下:管炉温度,1000℃;热分解时间,35分钟;载体气体流速,0.1L.min(-1);吸收液中氢氧化钠(NaOH)浓度,0.8mol.L-1;吸收液的体积,20mL。发现土壤中砷的检测极限(3 sigma,n = 20)为0.15μg(-1),如使用该热解法测定。使用该方法获得的标准土壤样品(GBW07425和GBW07454)获得的结果与这两种上述标准样品的认证值一致。该方法已成功应用以确定一些实际土壤样品中的总砷。

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