This study aims to utilize the extracts of iron sand and activated charcoal of cashew nut shells as the preparation of powder ink (Toner). Samples through several stages, carbonate stage of cashew nut samples at 500C for 9 hours using pyrolysis reactor, extraction phase of iron sand sample, grinding stage and sieving 200 mesh, activation charcoal of cashew nut shells using furnace electrical a temperature of 700C for 30 minutes, the next stage of mixing the samples for 5 hours with activated charcoal mass fraction of 40%, 60%, 80%, followed by mixed with polyacrylic acid 10 gram, then dried using a furnace at 150 ° C for 30 minutes, crushed and sieved to 200 mesh. The results of yield of the received toner grain size of 2.90 μm, 3.21μm, and 4.91μm. Analysis show that the composite of iron sand and active leather levels qualified to be made as a toner.
Telah dibuat filter elektromagnetik yang berisi 350 gram pasir besi dari Pantai Laeya Kabupaten Buton Selatan. Filter elektromagnetik menggunakan pipa PVC berdiameter 1 inci dan menggunakan rangkaian listrik bertegangan 16 Volt. Filter ini digunakan untuk menyerap logam berat pada sampel air Teluk Kendari dengan memvariasikan waktu penyaringan 5, 10, 15, 20 hingga 25 menit dan jumlah lilitan kawat 1300, 1600 dan 2000. Kadar logam yang diukur dengan Spektrofotometer Serapan Atom menunjukkan penurunan optimum kadar logam berat pada 25 menit penyaringan berturut-turut 0,0333 mg/l, 0,0785 mg/l, dan 0,0181 mg/l untuk Pb, Zn, dan Co dengan penyerapan maksimum berturut-turut 96,02 %, 82,86 % dan 75,57% untuk Pb, Zn dan Co. Variasi jumlah lilitan kawat memperoleh hasil optimum pada 2000 lilitan yaitu berturut-turut 0,0026 mg/l, 0,0131 mg/l, dan 0,0063 mg/l untuk Pb, Zn, dan Co. Hal ini menunjukan filter elektromagnetik mampu menurunkan kadar logam Pb, Zn dan Co dengan serapan hampir mencapai 100%.
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