The Monitoring of Organic Waste Pollution in The Sibelis River

Has conducted monitoring of organic waste pollution in the River Sibelis of Tegal City of Central Java. Organic wastes that pollute River Sibelis can degrade the quality of well water along the river. Monitoring carried out in the upstream and downstream by chemical oxygen demand (COD) and biochemical oxygen demand (HOD) parameters. COD test methods by titration and the results are used to detennine the test sample comparison with the volume of diluent required for analysts HOD. COD test results on the upstream and downstream Sibelis River respectively 58.13 mg / L and 73.97 mg / L so that the ratio of the test sample with diluent volume for HOD analysis is 20: 280 (Sawyer, 1978). HOD test principle is based on the reduction of dissolved oxygen zero day (DO0) and five days (DO5). The result of observation BOD samples at upstream and downstream Sibelis Rivers are 10.7212 mg / L and 5.3792 mg / L respectively. Quality control of HOD testing conducted with measurement accuracy and precision and obtained result are 85.36% and 0.27% respectively. The result of uncertainty measurement for HOD testing at upstream and downstream are +/- 0.4469 mg/L and +/- 0.22188 mg/L.