토양환경 분야PS-13 : 지렁이의 비소, 카드뮴의 유효성에 대한 바이오차 역할

Soil contamination with heavy metal(loid)s has increasingly become a serious global environmental issue in recent years with considerable efforts made to remediate the contaminated soils. Interest in using biochar as a soil amendment is increasing because of its capacity to adsorb metal(loid)s and organic pollutants. This study investigated the effect of hairy vetch (HV) and poultry manure biochars (PMBC) (2% w/w) at 450 and 700℃ on the availability of arsenic (As) and cadmium (Cd) to earthworms ( Eisenia fetida) in a highly contaminated As soil. The bioavailability of As and Cd to earthworms was determined bymortality and avoidance tests. Biochars reduced the extractable As and Cd by 45-89% in treated soils. Weight loss of worms was observed in all the treatments. The mortality percentage reduced by 70-80% in biochars compared to control. Biochars PMBC 700, and HVBC 450 greatly reduced the metal(loid) accumulation in worm tissues compared to control. In the avoidance test, earthworms preferred the low-temperature biochars compared to the high-temperature soils. The worms partially selected both the treatments when placed between the control and biochars which may be due to presence of metal(loid)s in biochars. The availability of metal(loid)s to earthworms varied between the biochars (feed stock and temperature), therefore, care must be taken during the selection of amendments to remediate contaminated soils.