Study On The Methods For Determination Of Trace Cadmium(Ⅱ) And Copper(Ⅱ) In Seawater By On-Line Concentration Flow Injection-Spectrophotometry

There are all kinds of methods for determination of heavy metal elements in seawater. Spetrophotometry, atomic absorption spectrometry, inductively coupled plasma atomic emission spectrometry or mass spectrometric, voltammetric, chemistry luminescence and atomic fluorescence spectrometry are general analytical methods for determination of heavy metal elements in seawater. However, some of these methods are operating complicatedly, some are needing expensive apparatus, and others are consuming more reagent. At the same time, due to analyzing sample only in laboratory after sampling, these methods are limited by condition and aren't fit for on-line and continuous determination, which is fateful disadvantage of those methods. Therefore, it is becoming a significant problem needing be settled urgently to research on the method of automatic analysis method for detecting of heavy metals in seawater.Aiming at the characteristics of seawater with low level of heavy metal and high interference of background, the method combined on-line concentration with flow injection-spectrophotometry is put forwarded to this paper, in order to achieving analyzing heavy metal in seawater automatically and locally. The thesis does research on the methods of analyzing cadmium and copper automatically. During the research, Chaleted resin columm made in our laboratory was chosed for concentration, and ethylic violet is chose for chromogenic reagent. At one time, the automatic analysis methods of determination cadmium and copper in seawater by flow injection-spectrophotometry with on-line concentration are established respectively.