RELATIONSHIP BETWEEN LEAD (PB) IN SEDIMENT, SEAWEED AND BRACKISH WATER PONDS IN TEGAL CITYNurjanah, Ambariyanto, Supriharyono and Bambang Yulianto
Pb pollution caused by industrial and domestic waste is harmful to coastal areas, including ponds. In the present study, Pb concentration was measured from eight seaweed ponds. This study analyzed the relationship between Pb and water quality parameters in seaweed (Gracilaria verucosa) ponds. Pb concentration in the pond water ranged from undetected to 0.025 mg l-1, Pb concentration in sediment ranged from 6,377 to 23,699 mg l-1, and that in seaweed ranged from Pb 0,028 to 3,240 mg l-1. Regression equation for relationship between Pb in water and Pb in sediment was Z = Pb Z = 13,702-207X, R = 0,408, R2 = 0,167, The equation for relation between Pb in water and Pb in seaweed was Y = 0,006 + 44,833X, R = 0,346, R2 = 0,120, and the relation between Pb in sediment and Pb in sediment and Pb in seaweed was Y = 1,759-0,117Z, R = 0,453, R2 = 0,211. Pb concentration of the ponds water was below the quality standard determined by the Indonesian Ministry of Environment. Following PCA analysis, it was concluded that the Pb concentration in seaweed ponds was affected by pH (66.44%), salinity (23.34%), and nitrite (10.22%).