【作者】 李敏；

【导师】 张克荣；

【作者基本信息】 四川大学 ， 劳动卫生与环境卫生学， 2004， 硕士

【摘要】 用直接插入计算机扩展槽的A/D转换卡,把JP—2型示波极谱仪输出的电信号转换为数字信号,并用虚拟仪器开发软件LabVIEW编写了数据采集与存储的控制软件,实现了用计算机显示与采集极谱数据,并把此改装仪器用于三种丁基锡化合物的测定。 丁基锡化合物在工农业生产中有广泛的应用,但同时对许多非目标生物造成危害,通过生物富集还可能影响人体健康。在pH6.0的乙酸—乙酸钠缓冲溶液中,单种丁基锡化合物具有良好的极谱峰,一丁基锡和三丁基锡的峰电位分别为-0.70V和-1.18V(vs. SCE),在该底液体系中二丁基锡有两个极谱峰,峰电位分别为-0.78V和-0.88V(vs. SCE)。MBT在0.6μg/mL～1.8μg/mL、DBT和TBT在0.3μg/mL～1.8μg/mL范围内峰电流与含量有良好的线性关系,相关系数r分别为0.993、0.998和0.996。 当三种化合物同时存在于该底液中时,彼此之间峰电流存在相互影响,本文引入具有优良多元校正能力的偏最小二乘法,对混合物极谱图进行多元分辨,并应用小波变换的数据压缩能力,把谱图数据由最初的520个点压缩到仅26个点,提取了混合物原始谱图中的有用信息,减少了偏最小二乘的输入参数,获得了较为满意的结果。三物质同时测定的平均回收率为96.2%～101.2%,相对标准偏差分别为三丁基锡3.2%、二更多还原

【Abstract】 Butyltins were widely used as fungicides in agriculture, antifouling in ship paints, and stabilizers for PVC in plastics industry. Tributyltin (TBT) has been largely applied in ship paints to prevent alga and conch’s cohesion. The toxicity of butyltins on organisms depends on their chemical species and TBT is the most toxic species. It also may have some effects on human being through the bioaccumulation of food chain.A computerized oscillographic polarography (Model JP-2) was devised to fulfill the simultaneous determination of three butyltins. The polarograms were transformed to digital signal by an analog-to-digital card , then the real-time data were collected and stored by a laboratory-written LabVIEW program.In a 0.4mol/L HAC-NaAC buffer solution(pH6.0), tributyltin, dibutyltin(DBT) and monobutyltin(MBT) each has a polarographic wave. The peak potentials of MBT and TBT were at -0.70V and -1.18V(vs. SCE). DBT had two polarographic waves with peak potentials at -0.78V and -0.88V(vs. SCE). The peak current and the concentration have linear correlation in the range of 0.6 μ g/ml~1.8 μ g/ml for MBT and 0.3 μg/mL~1.8 μ g/mL for DBT and TBT. Correlation coefficients were 0.993, 0.998 and 0.996. When there were two and/or three butyltins in the solution,severely interfered polarograms were observed and make it difficult to simultaneously determine each of butyltins by polarography. PLS2 was chosen to resolve the polarograms. Wavelet transform was selected to extract useful information for modeling PLS and polarographic data could be compressed from 520 points to 26 points. Simultaneous determination of monobutyltin, dibutyltin and tributyltin by polarography has been achieved successfully. The average recoveries were in the range of 96.2%~101.2% and the relative standard deviations (RSD) of MBT, DBT, TBT were 3.2%, 3.48% and 11.9% respectively.更多还原