LAUSR

This research conducted to measure the chemical parameters and estimate the carrying capacity of the environmentof lake Duma GalelaNorth Halmahera Utara. The air quality test uses the Air Quality Index approach that is unbeatable with PP. 82 of 2001. The results showed Lake Duma TSS levels at TS-1 26.5 mg/L, TS-2 23.8 mg/L, TS-3 21.7 mg/Land TS-4 24.9 mg/L. The value of Chemical Oxygen Demand (COD) averaged 3-4 mg/L. The Dissolved Oxygen (DO) value was between 5.3-6.7mg/L. Sulfate TS-1 11.63 mg/L, TS-2 12.15 mg/L, TS-3 11.52 mg/Land TS-4 11.23 mg/L. Chloride ion (Cl-) TS-1 23.46 mg/L, TS-2 23.16 mg/L, TS-3 23.41 mg/Land TS-4 21.86 mg/L. Iron (Fe) TS-1 0.0472 mg/L, TS-2 0.0516 mg/L, TS-3 0.0608 mg/L and TS-4 0.0434 mg/L. Cadmium (Cd) TS-1 0.007 mg/L,TS-2 0.007 mg/L, TS-3 ND and TS-4 0.009 mg/L. Nitrate between 0.0063-0.23 mg/L . Lead (Pb) TS-1 0.03 mg/L , TS-2 0.02 mg/L, TS-3 0.04 mg/Land TS-4 0.06 mg/L, Zn TS-1 0.01 mg/L, TS-2 0.02 mg/L, TS-3 0.03 mg/L, and TS-4 0.01 mg/L. Thus, lake Duma is in a good condition for use in fish farming to support the communitys economy.