Heavy metal residues in water and fishes at Karangsong Mangrove Conservation Area, Indramayu

Abstract

The study of heavy metal residues in water and fishes were conducted at Karangsong Mangrove Conservation Area, Indramayu. The samples were taken discretely in July 2016 at four stations representing the areas of fish pond, sea water, high density mangroves and low density mangroves. Observed parameters were heavy metals (Hg, Pb, and Cd), water quality (salinity, pH, BOD, COD, oils and fats), and nutrient contents (total phosphate, total nitrogen, and MBAS). Heavy metal residues in water and fishes were analyzed in laboratory of SEAMEO BIOTROP using Atomic Absorption Spectrophotometer (AAS) and ICP MS (for Cd and Pb). In 2008, the content of Cd in sea water was 0.034 mg/L,subsequently decreased to 0.0020 mg/L in 2016. Sea water Pb content in 2008 was 0.27 mg/L,later decreased to 0.0012 mg/L in 2016. Furthermore, the analysis results of heavy metal residues in water and fishes were exceeded the MRL (Maximum Residue Limit). Levels of heavy metals in fishes from 0.01 to 0.17 mg/L Hg; 0.92 to 3.87 mg/L Cd; 1.88 to 21.49 mg/L Pb above the threshold regulation of Ditjen POM RI No 03725/B/SK/VII/89.