Pengaruh Penambahan Al3+ dalam Penentuan Analisa Fe2+ pada pH 4,5 dengan Pengompleks 1,10-Fenantrolin Secara Spektrofotometri Sinar Tampak

Abstract

Penentuan analisa besi menggunakan instrument spektrofotometer sinar tampak, dimana besi dikomplekskan dengan menggunakan ligan 1,10-fenantrolin. Sebelum dikomplekskan, Fe³⁺ direduksi terlebih dahulu menjadi Fe²⁺ dengan pereduksi natrium tiosulfat akan membentuk kompleks Fe²⁺ dengan 1,10-fenantrolin yang memberikan serapan di daerah visible pada panjang gelombang 507 nm dengan penampakan warna merah orange. Analisa penentuan Fe²⁺ dengan pengompleks 1,10-fenantrolin ditambahkan ion Al³⁺ pada kondisi pH 4,5. Penambahan Al³⁺ mulai mengganggu analisa besi pada saat penambahan 0,122 ppm dengan persen recovery sebesar 90,74%.

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