Heavy metal ions in water were removed using algal biomass as adsorbents. Absorbents were dried for 3 days, ground them by 40∼60 mesh and then were swelled in a buffer solution for 1hr. After being packed in the column, commercially available standard solution of Cd(Ⅱ) and Pb(Ⅱ) ions were diluted to get the suitable concentration and then it was eluted with the rate of 1 ㎖/min. Heavy metals on the adsorbents were recovered with nitric acid.
More amounts of Cd(Ⅱ) or Pb(Ⅱ) ions in green algae, Ulva pertusa, than in brown algae, Sargassum hornerl, were adsorbed. Pb(Ⅱ) ion was adsorbed more than Cd(Ⅱ) ion in both algae. The pH effect of adsorbed amounts of Cd(Ⅱ), Pb(Ⅱ) ions on the biomass was shown the following order ; pH 10.5 > 8.5 > 7.0 > 5.5 > 3.5. Recovery ratio of metal ions from algae is shown higher in acidic or neural conditions than It in alkalis ones. Pb(Ⅱ) ion is recovered relatively more than Cd(Ⅱ) ion in our system.

• 김영하(강릉대학교 환경과학연구소) | Young-Ha Kim (EnvironmentaI Science Institute, Kangnung National University)
• 박미아(강릉대학교 공업화학과) | Mi-A Park (Department of Industrical Chemistry, Kangnung National University)
• 박수인(서울시립대학교 화학공학과) | Soo-In Park (Department of Chemical Engineering, Seoul City University)
• 김택제(경기대학교 화학과) | Tack-Je Kim (Department of Chemistry, Kyonggi University)
• 이기창(명지대학교 화학공학과) | Ki-Chang Lee (Department of Chemical Engineering, Myongji University)
• 박광하(강릉대학교 공업화학과) | Kwang-Ha Park (Department of Industrical Chemistry, Kangnung National University)