Bioaccumulation Of Lead (Plumbum) In Red Tilapia Fish From The Jombor Swamp

Lead (Plumbum, chemically known as Pb) is a dangerous heavy metal usually found in daily activities, such as fuel. Jombor swamp is located in Krakitan village, Bayat, Klaten. Daily routines by people inside or around the swamp cause a lot of pollution, which came from the waste of floating shops, agricultures, households, and fisheries. The purpose of this research was to analyze lead concentration inside the meat of red tilapia fish (oreochromis sp) in Jombor swamp. This research used an observational method, which means that researchers did not investigate the effect of intervention. The samples were taken with cluster sampling method consisting of 3 clusters. They included north cluster I, east cluster II and south cluster III. 25 grams of samples taken from each cluster, in which the fishes were cultured in Jombor swamp for 3 months with the same size. The analysis was conducted with atomic absorbance spectrophotometer, and the data obtained were processed with computerization spectrophotometry method of atomic absorption and the data are processed with computerization programme to examine the mean and deviation standard. This research found that the median of cluster I was 1,45275 mg/kg, cluster II was 0,3143 mg/kg and cluster III was 0,3129 mg/kg. Conclusion: meat of red tilapia fishes cultured in Culture I Jombor swamp positively contained lead as many as 1,45275 mg/kg with safety limit of 0,2 mg/kg. (paper)