Penentuan Kadar Fosfat dalam Limbah Cair Industri Detergen dan Kadar Amonia dalam Limbah Cair pelayanan Kesehatan dengan Metode Spektrofotometri UV-Visible

Abstract

Determination of Phosphate levels in detergent industrial liquid was wastewater and Ammonia levels in health service liquid was wastewater with the UV-Visible spectrophotometric method had been carried out at the UPT Laboratorium Lingkungan Dinas Lingkungan Hidup Provinsi Sumatera Utara. Determination of Phosphate levels, carried out by the addition of phenolphthalein indicator in to the sample, followed by the addition of a mixed solution consisting of sulfuric acid, potassium antimonyl tartrate, ammonium molybdate, ascorbic acid, then homogenized. The homogeneous solution was analyzed using a UV-Visible spectrophotometer at a wavelength of 880 nm. Determination of ammonia levels, carried out by the addition of phenol solution, sodium nitroprusid solution, and oxidizing solution into the sample and homogenized, then closed and left for 1 hour then analyzed using a UV-Visible spectrophotometer at a wavelength of 640 nm. Based on the results of the calculations carried out, Phosphate levels were obtained for each sample with codes A, B, and C, obtained at 0.7368 mg/L; 0.6831 mg/L; and 0.7737 mg/L. Ammonia levels for each sample with codes D, E, and F were obtained at 0.3713 mg/L; 0.6716 mg/L; and 1.5329 mg/L. In accordance with the Regulation of the Minister of Environment of the Republic of Indonesia No. 5 of 2014 concerning Wastewater Quality Standards, that the maximum level for Phosphate is 2 mg/L and the maximum level for Ammonia is 10 mg/L. Based on the analysis data that has been obtained, it shows that the Phosphate levels in industrial detergent liquid was wastewater and Ammonia levels in health service liquid was wastewater meet the requirements for wastewater quality standards.