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首页> 外文会议>International conference on nuclear analytical methods in the life sciences(NAMLS) : Abstracts >SPECIATION OF TRACE ELEMENTS IN LEACHATES FROM LANDFILLS IN RELATION TO WATER QUALITY ASSESSMENT
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SPECIATION OF TRACE ELEMENTS IN LEACHATES FROM LANDFILLS IN RELATION TO WATER QUALITY ASSESSMENT

机译：填埋场渗滤液中微量元素的含量与水质评估的关系

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Speciation studies on arsenic and selenium were carried out on water samples taken from rivers in the vicinity of landfill areas used as land-based waste disposal system. These rivers are used as water intake points and the raw water is treated prior to distribution for domestic and industrial uses. Leachates from these landfill areas are capable of contaminating the river water through underground seepage or overflowing especially after a heavy downpour. The quantitative aspects of the arsenic and selenium species were evaluated by looking at water quality parameters taken during the sampling procedure. Preconcentration of the chemical species was done using a mixture of ammonium pyrrolidinethiocarbamate-chloroform (APDTC-CHCl_3). Since only the reduced forms of both arsenic and selenium species could be extracted by the preconcentrating mixture, suitable reducing agents such as 25% sodium thiosulphate for As(III) and 6M HC1 for Se(IV) were used throughout the studies. Care was taken to exclude the interfering elements such as the alkali and alkali earth metals from the inorganic arsenic and selenium species by introducing 12% EDTA solution as the masking agent. The extracted mixture was irradiated in a thermal neutron flux of 4 × 10~(12) n.cm~(-2) s~(-1) from a TRIGA Mk.II reactor at the Malaysia Institute of Nuclear Technology Research (MINT). Gamma rays of 559 keV and 297 keV from the ~(76)As and ~(75)Se respectively were used in the quantitative determination of the inorganic species. Mixed standards of As(III) and Se(IV) used in the percentage efficiency procedure were prepared from salts of Analar grade. Water quality evaluation was viewed not only from the ratio of the inorganic species present but also from other physical and chemical parameters normally used in water quality studies.
机译：对砷和硒的形态学研究是对垃圾掩埋区附近河流中的水样进行的，这些垃圾被用作陆上废物处理系统。这些河流用作取水点，原水经过处理后再分配用于家庭和工业用途。这些垃圾掩埋场的渗滤液能够通过地下渗漏或溢流污染河水，尤其是在倾盆大雨之后。通过查看采样过程中获取的水质参数来评估砷和硒物种的定量方面。使用吡咯烷硫代氨基甲酸铵-氯仿（APDTC-CHCl_3）的混合物对化学物质进行预浓缩。由于预浓缩混合物只能提取砷和硒物种的还原形式，因此在整个研究中均使用了合适的还原剂，例如25％的As（III）硫代硫酸钠和6M HCl的Se（IV）还原剂。通过引入12％EDTA溶液作为掩蔽剂，要小心地从无机砷和硒物质中排除干扰元素，例如碱金属和碱土金属。从马来西亚核技术研究所（MINT）的TRIGA Mk.II反应堆以4×10〜（12）n.cm〜（-2）s〜（-1）的热中子通量辐照提取的混合物。 。 〜（76）As和〜（75）Se分别产生559 keV和297 keV的伽马射线，用于定量测定无机物。百分比效率法中使用的As（III）和Se（IV）的混合标准品是由Analar级盐制备的。不仅从存在的无机物种的比例，而且从水质研究中通常使用的其他物理和化学参数来看水质评价。

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