Liquid Chromatograph-Catalytic Analysis as a Automatic and Fractional Determination Method with Extremely High Sensitivity

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1 Automatic and fractional determination of vanadium (IV and V) and iron (II and III) by liquid chromatograph-catalytic analysisVanadium was determined sensitively by air-segmented continuous flow analysis (ASCFA) based on a catalytic reaction with potassium bromate and Bindschedler's green leuco base. Vanadium (IV and V) were separated each other by using the Tosoh model TSK gel IC-Cation as a separation column, and the mixture (pH 3.0) of 0.2 mM ethylenediamine and 1.0 mM tartaric acid as a eluate. By connecting these two methods, vanadium (IV and V) were determined automatically and fractionally. Determination range by the present method was 5 - 300 nM for each vanadium speciese.Iron was also determined by the above catalytic reaction. However, we have not succeed to separate vanadium and iron by liquid chromatography. We have been investigating their separation.2 Automatic and fractional determination of cobalt, manganese and iron by liquid chromatograph - catalytic analysisCobalt, manganese and iron were separated one another by using Shimadzu model Shim-pack IC-C1 gel as a separation column, and 0.3 M lactic acid as a eluate. These elements were determined by ASCFA based on a catalytic reaction with hydrogen peroxide and tiron. Now, we have been trying to connect these two methods.3 Elemental composition of waters and deposits collected along the acid river SukawaRedox potential of VO_2^+/VO^<2+> suggests that vanadium (IV) dissolves more stably in acid solution. We investigated preliminarily the elemental composition of waters and deposits collected along the acid river Sukawa, Yamagata Pref., in order to apply our liquid chromatograph-catalytic analysis for vanadium (IV and V) to natural acid water samples. Total concentration of vanadium (IV and V) was very high and ranged from 2 to 5 muM.