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. 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 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.

ABSTRACT
1. 서 론
2. 재료 및 실험방법
    2.1 PACl 응집제의 제조
    2.2 Al(Ⅲ) 가수분해 종의 특성 실험
    2.3 응집실험
    2.4 수질분석
3. 결 과
    3.1 Al(Ⅲ) 가수분해 종 검량선 작성
    3.2 Ferron 시약 제조 방법에 따른 흡광도 안정성
    3.3 Ferron 발색시약 제조에 따른 Al(Ⅲ)가수분해 종분포
    3.4 Al(Ⅲ)가수분해 종 분포에 따른 응집 특성
4. 결 론
사 사
References

• 윤미형(부경대학교 환경공학과) | Mihyoung Yoon (Department of Environmental Engineering, Pukyong National University)
• 강임석(부경대학교 환경공학과) | Limseok Kang (Department of Environmental Engineering, Pukyong National University) Corresponding author