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前言水中微量锌的测定方法,目前使用的有亚铁氰化钾比浊法、若丹明比色法和双硫腙比色法等。前两法在水相中进行比浊或比色,操作虽属简便,但因铜离子的干扰,在实际使用中受到一定的限制。双硫腙法虽然具有灵敏度较高的优点,但因双硫腙很不稳定,影响测定的因素较多,且不溶于水,需用有机溶剂萃取,试剂的配制和测定的操作,不够简便。为了适应水质分析工作的需要,探索新的分析方法,都是有必要的。吡啶-(2-偶氮-4)-雷琐辛简称PAR,是一种橙黄色晶体,易溶于水,性质比较稳定。它的水溶液与锌离子作用,立即生成红色的水溶性络合物。这一反应为锌的含量测定
Preface Determination of trace zinc in water, currently used are potassium ferrocyanide Nephelometry, rhodamine colorimetric and dithizone colorimetric method. The first two methods turbid or colorimetric in the water phase, although the operation is simple, but due to the interference of copper ions in the actual use of certain restrictions. Although the dithizone method has the advantages of high sensitivity, the dithizone is not stable because of its instability. The factors that influence the determination are relatively large and do not dissolve in water. Therefore, it is inconvenient to use organic solvent extraction, reagent preparation and determination. In order to meet the needs of water quality analysis, exploration of new analytical methods are necessary. Pyridine - (2-azo-4) - Reszosin referred to PAR, is an orange-yellow crystal, soluble in water, the nature of relatively stable. Its aqueous solution and zinc ions, the immediate formation of red water-soluble complexes. The reaction is zinc content determination