산지별 천연황토의 광물학적 특성에 따른 적조구제 효과

Abstract

Hwangto from different localities showed the wide range of chemical compositions SiO₂=43~71%, Al₂O₃=13~26%, Fe₂O₃=5~14%, MgO=0.4~1.8%, K₂O=0.6~3.3%, L.O.I. (Loss of Ignition)=4.5~15%. Moreover small amounts of Mn, Ca and P were existed in Hwangto. The mineral compositions of Hwangto were mainly consisted of quartz and feldspar. A little amount of kaolinite, chlorite, and Fe-oxides were included. The result of size analysis shows that 6Φ(31~16㎛) and 7Φ(16~8㎛) were dominated sizes in th sample. The concentration of organic carbon and Zeta-potentian were in the range of 0.1~0.81% (average 0.36%) and -4.14~-20.65mV (average -13.67), respectively. As increasing removal efficiency of Cochlodinium polykrikoides, contents of Al₂O₃, Fe₂O₃ and L.O.I. in Hwangto were increased, whereas SiO₂ content was decreased. Furthermore, the amounts of clay mineral, organic carbon and small particle were high when the removal efficiency was high. According to factor analysis used to principle component analysis, two components of factor 1 and factor 2 describe 79% of the total variance, which is related to cohesion and adsorption.