개선된 Ferron 분석 비교를 통한 Al(Ⅲ) 가수분해종 특성 연구

Abstract

In this study, newly improved Ferron assay test haved on timed spectrometry was used for the determination of hyolrolytic Al species presented in PACl coagulant. Comparison of the distribution of aluminum hydrolyzed species was made according to the difference in the preparation method of ferron colorimetric reagents to confirm whether it is available. The color development reagent ferron was prepared by using conventional method and two newly developed methods. Then the ferron assay test was used to compare and analyze the distribution of Al(III) hydrolyzed species presented in the prepared PACl and alum. The distribution of Al(III) hydrolyzed species using the preparation of conventional method and newly developed method, both colorimetric solutions showed similar distribution of Al(III) hydrolyzed species presented in PACls (r value=0, 1.5, 2.0, 2.5) and alum. The preparing method of reagent A required an aging period of 7 days by adding a hydroxylamine hydroxide and a 1,10-phenanthroline monohydrate reagent, whereas the preparing method of reagent B was used as a coloring agent immediately without aging time. The regression analysis between UV absorbance and Al concentrations of conventional method and newly developed method of ferron reagents in low-concentration aluminum solutions and high-concentration aluminum solutions, showed the correlation coefficients of 0.999 or higher, as showing high correlations of conventional method and newly developed method. Applying Ferron assay test, Al species in the PACls and alum were classified as Ala(monomeric Al), Alb(polymeric Al), and Alc(colloidal and precipitated Al). Distribution of Al(III) hydrolyzed species according to the preparation of ferron colorimetric reagents was similar.