Identifikasi Pencemaran Logam Berat Air Kolong dan Air Sumur di Sekitar Bekas Tambang Timah Perayun Kundur, Kepulauan Riau
DOI:
https://doi.org/10.25077/jfu.8.4.329-335.2019Abstract
Telah dilakukan penelitian untuk mengidentifikasi pencemaran logam berat pada air sumur yang berada di sekitar kolam bekas tambang timah (air kolong) di Perayun Kundur, Kepulauan Riau. Pengujian pada penelitian ini adalah pengukuran nilai pH, konduktivitas listrik, total dissolved solid (TDS) dan kandungan logam berat berupa timbal (Pb), tembaga (Cu) dan kadmium (Cd). Nilai pH air kolong berada antara 4,38-5,24 dan air sumur berkisar antara 3,28-7,32. Nilai rata-rata kondutivitas listrik pada air kolong sebesar 164,91 µS/cm, dan untuk air sumur berkisar antara 42,83-164,1 µS/cm. Nilai TDS rata-rata pada air kolong adalah 544 ppm dan pada air sumur berkisar antara 27-614 ppm sesuai dengan tingkat salinitas air tawar. Hasil pengujian logam berat menggunakan atomic absorption spectroscopy (AAS) diperoleh nilai konsentrasi rata-rata untuk Pb pada air kolong sebesar 0,005 mg/L, pada air sumur <0,03 mg/L. Konsentrasi logam Cd pada air kolong sebesar 0,006 mg/L dan pada air sumur sebesar 0,007 mg/L. Konsentrasi logam Cu pada air kolong adalah 0,06 mg/L dan pada air sumur sebesar 0,011 mg/L. Konsentrasi logam Cu pada pengukuran di kolong bekas tambang timah telah berada di luar batas ambang baku mutu Peraturan Pemerintah No.82 Tahun 2001. Nilai baku mutu untuk logam Pb sebesar 0,03 mg/L, Logam Cd sebesar 0,001 mg/L dan logam Cu sebesar 0,02 mg/L.
Kata kunci: air kolong, konduktivitas listrik, total disolved solid, atomic absorption spectroscopy.
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