Optimasi pH Buffer dan Konsentrasi Larutan Pereduksi K₂C₂O₄ dalam Penentuan Kadar Besi dengan Pengompleks 1,10-Fenantrolin secara Spektrofotometri UV-Vis

Ariyanti, Dhita (2011) Optimasi pH Buffer dan Konsentrasi Larutan Pereduksi K₂C₂O₄ dalam Penentuan Kadar Besi dengan Pengompleks 1,10-Fenantrolin secara Spektrofotometri UV-Vis. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Telah dilakukan penelitian tentang optimasi pH buffer dan konsentrasi larutan reduktor K₂C₂O₄ untuk mereduksi 5 ppm Fe³⁺ menjadi Fe²⁺ secara spektrofotometri UV–Vis, dimana buffer asetat sebagai buffer asam dan buffer ammonium sebagai buffer basa. Penelitian dimulai dengan penentuan λmaks, dengan λmaks inilah penentuan kondisi optimum dilakukan agar kepekaan analisa maksimum. Dilakukan beberapa variasi pH dan konsentrasi reduktor untuk mengetahui kondisi optimum. Diketahui pH 4,5 dengan 3 ppm K₂C₂O₄ pada kondisi asam, optimum untuk mereduksi 5 ppm Fe³⁺ menjadi Fe²⁺ dengan pembentukan kompleks [(Fe(C₁₂H₈N₂)₃)]²⁺, tetapi pada kondisi basa tidak terbentuk kompleks ini, melainkan kompleks [(Fe(C₁₂H₈N₂)₂(OH)₂]. Dengan RSD dibawah 20 ppt dan CV dibawah 2%, maka metode ini memiliki tingkat presisi yang baik. Kata Kunci: Reduksi, larutan buffer, K₂C₂O₄
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Buffer pH optimation and the consentration of K₂C₂O₄ reductor for reducton of 5 ppm Fe³⁺ to Fe²⁺ have been investigated. The first experiment was determination of λmaks and than various pH and concentration of K₂C₂O₄ as reductor in order that determination of optimum condition. The result showed that λmaks was 520 nm and pH 4,5 with 3 ppm of K₂C₂O₄ was effective to reduce 5 ppm of Fe³⁺ to Fe²⁺ in acid conditions forming [(Fe(C₁₂H₈N₂)₃)]²⁺ complex. But in base solution, this complex was not formed. Both acid and base conditions were effective and accurate, case of value of RSD under 20 ppt and CV under 2%. This indicator showed that this method was good. Keywords: Reduction, buffer solution, potassium oxalate

Item Type:	Thesis (Other)
Additional Information:	RSKi 543.55 Ari o
Uncontrolled Keywords:	Reduksi, larutan buffer,K₂C₂O₄, Reduction, buffer solution, potassium oxalate
Subjects:	Q Science > QD Chemistry > QD481 Chemical structure.
Divisions:	Faculty of Mathematics and Science > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	magang .
Date Deposited:	19 Oct 2026 02:36
Last Modified:	19 Oct 2026 02:36
URI:	http://repository.its.ac.id/id/eprint/145666

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