The application of nuclear technique for measuring the bioaccumulation of microplastic in oyster (<i>Crassostera Gigas</i>)

Abstract This study aims to determine the effect of salinity and microplastic concentration on the bioaccumulation ability of microplastics in oyster ( Crassostera Gigas ) using nuclear techniques. Biokinetic experiments were conducted using a single-compartment approach utilizing 131 I. The biokinetic experiment methods were biota collection, acclimatization, bioaccumulation, and elimination. Bioaccumulation was carried out by placing the biota in an aquarium containing seawater media spiked with PSS- 131 I with concentrations of 0.96, 1.93, and 3.85 mg L −1 and salinity differences of 30, 32, and 34 g L −1 for seven days and depuration for seven days by placing the organism in media without microplastics. The experimental results showed that the highest uptake value (CF) was in the 3.85 mg L −1 concentration treatment, which was 3.1 × 10 −5 mL g −1 and in the depuration process could maintain PSS- 131 I by 47 %. In the salinity treatment, the highest CF was at a salinity of 34 g L −1 with a value of 4 × 10 −5 mL.g-1. In the depuration process, it can maintain PSS- 131 I by 43 %. The experimental results showed that the bioaccumulation rate of PSS- 131 I was affected by salinity and concentration. Concentration and salinity were directly proportional to the increase in bioaccumulation.