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利用汞与碱性染料罗丹明B的荧光反应测定汞已有过报道,但由于体系中汞与罗丹明B所形成的络合物的荧光光谱与罗丹明B本身的荧光光谱相一致,需预先萃取掉过量的罗丹明B,不仅手续麻烦,而且又接触大量有毒有机试剂。本文利用非离子型表面活性剂聚乙烯醇PVA-124的特殊作用;在PVA-124存在下,利用汞与碘化物所生成的络阴离子与罗丹明B作用可形成能发出较强荧光的三元离子缔合物,并且与罗丹明B本身的最大激发和发射波长不相一致,借此可在水相中直接测定微量汞,而不用萃取分离,可直接用于海洋底质,矿物岩石及污染水样中微量汞的测定。
Mercury has been reported to be detected by the fluorescence reaction of rhodamine B with mercury. However, since the fluorescence spectrum of the complex formed between mercury and rhodamine B in the system is in agreement with the fluorescence spectrum of rhodamine B itself, Extraction of excess rhodamine B, not only troublesome procedures, but also contact with a large number of toxic organic reagents. In this paper, the use of non-ionic surfactant polyvinyl alcohol PVA-124’s special role in the presence of PVA-124, the use of mercury and iodide generated by the anion and rhodamine B can form a stronger fluorescence can emit ternary Ion complex and does not coincide with the maximum excitation and emission wavelength of rhodamine B itself, so that trace mercury can be directly measured in the aqueous phase without extraction and separation, and can be directly applied to marine substrates, mineral rocks and pollution Determination of trace mercury in water samples.