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Analysis of Water Quality based on Physico-chemical Parameters in Bolaang Mongondow Waters, North Sulawesi Bolaang Mongondow waters in North Sulawesi is very important estuarine waters due to both land and ocean influenced oceanographic conditions. Observations of water quality along Bolaang Mongondow coast-line have been carried out in February 2019. This study aim to analyze the quality of sea water based on the physico-chemical parameters of Bolaang Mongondow waters. The parameters observed includes temperature, the clarity of water, salinity, dissolved oxygen (DO), phosphate, nitrate and PH. Samplings were conducted using Nansen tube on the surface layer (0-1 m) and near the bottom (> 15 m) on 9 research stations along Bolaang Mongondow coast-line. Measurements of temperature, salinity, brightness and pH are carried out in situ. Dissolved oxygen was measured via electrochemical method using AZ 8563 DO meter. Phosphate and nitrate were analyzed according to the light transmission method by using the 'Nicolet Evolution 100' spectrophotometer. The results obtained are water temperature ranging from 28.6-29.3 oC; salinity 28.0-32.5 o/oo; water clarity of 7.0-14.5 m; pH 7.36-7.80; dissolved oxygen 4.83-6.41 ppm; phosphate 0,005-0,0230 mg/l and nitrate 0,005-0,0090 mg/l. The statistical analysis using t-test showed that phosphate and dissolved oxygen in the water surface and close to the bottom of water were significantly different (t-hit> t-tab). The calculated index poluion calculation shows that the waters of Bolaang Mongondow ranged between unpolluted and lightly polluted. Variations in temperature, water clarity, salinity, dissolved oxygen, phosphate, nitrate and pH obtained in this study are still adequate to sustain marine life.

Analisis Kualitas Perairan Bolaang Mongondow, Sulawesi Utara Berdasarkan Parameter Fisika-Kimia Air Laut