The Effect of seaweed (Eucheuma cottonii) extract and duration of soaking on reduction of Copper (Cu) level in Freshwater Mussel (Pilsbryoconcha exilis)

Abstract

Freshwater Mussels (Pilsbryoconcha exilis) are filter-feeder animals that have eating habits by filtering food in the water, making it possible that heavy metal copper (Cu) will accumulate in the body of the mussel. One type of seaweed that can absorb heavy metals is Eucheuma cottonii because it contains iota carrageenan (65%) which is a sulfated polysaccharide containing hydroxyl groups and carboxyl groups capable of retaining and accumulating heavy metals. In addition E. cottoni as a biosorbent in the aquatic environment. This research aims to determine the effect of extract concentration and the best soaking time in reducing copper (Cu) levels. This research was conducted from April to May 2023. In this study, the concentrations used were 6%, 10%, and 14% with a period of 45 minutes, 90 minutes, and 135 minutes. The results showed that the concentration of 14% extract with a soaking time of 135 minutes showed the highest decrease in copper (Cu) levels of 1.298 mg/kg or 87.10% and the lowest decrease in copper (Cu) metal levels at a concentration of 6% with a soaking time of 45 minutes of 0.442 mg/kg or 29.68%.