Determination Of Electroplating Solution And Electroplating Wastewater

This thesis consists of four parts as follows: Part I : ReviewThe development of the analysis of the galvanization solution and galvanization sewage have been reviewed such as the investigation evolve, the progress as well as their characteristics in detail and various analytical methods for sample solution of galvanization and sewage as well as their advantages and disadvantages were summarized. The main applications of this field was emphasized, too. As a series of new analytical methods, their prospect and problems were also discussed in this part. Part II: The components of galvanization solution and correspondingsewages were analysized by oscillopolarographic titration The principle, method and application of AC oscillopolarographic titration were detailedly introduced. Oscillopolarography has been widely applied to chemical analysis and test of medication. However, it was rarely applied in the dynamic solution of galvanization. It was irnportant to the quality of electroplates that the solution concentration was analyzed quickly and accurately. It will also be favorite to the Ivanoplasticsga industry if the plating-sewage was analyzed quickly and accurately. Furthermore, it is very important for the contaminated fountain controlled in the Ivanoplasticsga factory. The components of galvanization solution and the disposal of sewage were determined quickly and exactly. The oscillopolarography was succeessefully applied to control of the disposal of sewage and the solution of galvanization.The components of solution of galvanization were complex and the content of each cojnponent was directly related to the quality of the plating layer in the process of galvanization. Lots of toxicants which were always vital items of the environmental analysis were present in the solution of galvanization. It will do harm to mankind and the environment if the plating-sewage was not treated. The precipitate did not need separation and the coloured solution was not interfered with determination. Indicator was not needed in determination, too. The galvanization solutions of electroplating-chromium, zinc, copper, copper-tin-nickel alloy and corresponding sewages were analysized systematically by oscillopolarographic titrimetry based on the cuts in osillopolarograms. The results indicated the procedures were sensitive, highly selective, quick and simple. Part III: The solution of cobaltic lucency plating-nickel was determinedby extraction spectrophotometryThe solution of cobaltic lucency plating-nickel consistes of vitriol nickel, electrolyte, additive and luminous reagent. Proper cobalt salts were added to the electrolyte which has important effect on the quality. Therefore, the cobaltic content was correctly determinated that can ensure the quality of plating products. For determination of cobalt in acidic or neutral medium, Co2+ could form blue H2[Co(SCN)4] complex and then was extracted into butyl acetate. As a result, extraction spectrophotometric determination of cobalt in the lucency plating-nickel solution was developed. Part IV: The trace chromium in the sewage of chromeplate wasdetermined by extraction spectrophotometryCr3+ ion in plating-sewage was separated by ion-exchange method, it was oxided as HfeCrC^in nitrate medium, extracted into pentanol and then determined by spectrophotometry. The method has high selectivity and many metal ions were not interfer. In the concentration range of 1.00xl0~5g/rnL-1.20xl0~4g/mL, the absorbance was directly proportional to chromium concentration with a Sandel sensitivity of 0.098fig/cm2.