Abstract
River water pollution levels can be analysed based on fluoride levels. Excessive fluoride levels will cause fluorosis of the bones. While fluoride deficiency will cause brittleness of teeth and thinning of bones. The purpose of this study was to determine the level of river water pollution based on fluoride levels in Mataram City. Fluoride levels were tested by adding a solution of zirconyl alizarin as a reagent and a solution of Na arsenite, which was then analysed by UV-Vis spectrophotometry with a wavelength of 535 nm. The results showed that the fluoride levels in the 7 tested samples met the fluoride quality standards. The highest fluoride content of river water in Mataram city is 1.046 mg/L, while the lowest is 0.213 mg/L. From this study it can be concluded that based from 7 points location water river sample in Mataram City are not polluted by fluoride.
Highlights
River water pollution levels can be analysed based on fluoride levels
The results showed that the fluoride levels in the 7 tested samples met the fluoride quality standards
Peraturan Menteri Kesehatan RI tentang Persyaratan Kualitas
Summary
Bahan-bahan yang digunakan dalam menunjang penelitian ini yaitu aquades, sampel kontrol fluorida, larutan zirconil alizarin/pereaksi fluorida, larutan Na arsenit, dan larutan standar fluorida 100 ppm. Penelitian ini menggunakan metode spektrofotometri UV-Vis. Penentuan kadar fluorida dilakukan dengan menganalisis hubungan antara absorbansi dan konsentrasi berdasarkan persamaan garis dari hasil pengujian kurva kalibrasi. Standar pengujian yang digunakan dalam penelitian ini berdasarkan Petunjuk Pemeriksaan Air Minum/Air Bersih, Departemen Kesehatan Republik Indonesia. Sampel air sungai diambil di 7 titik lokasi dari 4 sungai yang ada di Kota Mataram dan metode pengambilannya sesuai dengan metode APHA-21-2005. Titik lokasi pengambilan yaitu di tepi sungai dan di sekitaran jembatan, berdasarkan pada panjang lintasan sungai yang mengalir melewati pemukiman warga serta aktivitas dan kepadatan populasi di sekitaran sungai. Pengambilan sampel dilakukan dengan tiga kali pengulangan pada setiap titik lokasi sungai. Standar baku mutu fluorida yang digunakan berdasarkan PerMenKes RI Nomor 32 Tahun 2017 yaitu tidak boleh melebihi 1,5 mg/L
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