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巰基棉—原子熒光光譜法測定三七中的微量砷.doc

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  • 更新時間:2014-06-09
  • 論文字數:7463
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  • 課題來源:(sana0722)提供原創文章

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摘  要:本文研究了高壓消解三七,巰基棉富集砷及原子熒光光譜法測定的條件。高壓消解三七的時間在2-6小時內,砷含量隨著時間延長而增大,當消解溫度在120℃-160℃期間,保持相同的消解時間,則測得的砷含量略有波動,波動范圍在1.8%-6.6%之間。用巰基棉富集溶液中的微量砷時,富集率很好,但用5ml HNO3(1+1)及2.0ml HCl(3.0mol/L)在80℃下洗脫巰基棉上的砷時,卻較難洗脫。在常用的儀器條件下,用原子熒光光譜儀測定溶液中的砷含量時,在0-10ug/L范圍內,熒光強度與砷含量呈很好的線性關系,相關系數r=0.9978. 用AFS法測定,三七中的砷含量范圍為0.95mg/kg-1.15mg/kg。

關鍵詞:云南三七;原子熒光譜法;砷;巰基棉

 

ABSTRACT:The conditions of high pressure treatment Sanqi, enrichment arsenic(As) from its dilute solution and determination of arsenic by atomic fluorescence spectrometry(AFS) was studied. During the time range of 2 hours to 6 hours for dissolve Sanqi at high pressure, arsenic content increased with time increased. During the temperature range of 120℃ to 160℃ for dissolve Sanqi at the same time, arsenic content fluctuation was range of 1.8%-6.6%. The rate of concentration arsenic from the solution by sulfhydryl cotton was very good, but eluting arsenic from  sulfhydryl cotton was difficult used 5 mL HNO3 (1+1) and 2.0 mL HCl (3.0mol/L) at 80℃. At normal the instrument conditions used AFS, the fluorescence intensity changes linearly with arsenic content at range of 0-10ug/L arsenic, r=0.9978. Arsenic content in the Sanqi was at range from 0.95mg/kg to 1.15mg/kg detected by AFS.

Keywords:  Sanqi, atomic fluorescence spectrometry, arsenic, sulfhydryl cotton

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