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Djarot Sugiarso
Departemen Kimia ITS
Chemistry

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Optimation of Buffer Solution and K2C2O4 Reductor to Fe(II)-1,10-fenantrolin Determination using Spectrophotometric UV-Vis Dhita Ariyanti; Djarot Sugiarso
Akta Kimia Indonesia Vol 3, No 2 (2018)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (617.121 KB) | DOI: 10.12962/j25493736.v3i2.4265

Abstract

Iron was needed in the world to all components, so it was important to determine iron’s concentrate. This research determined buffer pH optimation and the consentration of K2C2O4 reductor. Reduction 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 by spectrophotometric UV-Visible. 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.
Metode Analisis Besi Melalui Optimasi Kemampuan Agen Pereduksi NH2OH.HCl dan C6H8N2 Praditya Bagaskara; Djarot Sugiarso; Fredy Kurniawan
Akta Kimia Indonesia Vol 5, No 1 (2020)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (492.017 KB) | DOI: 10.12962/j25493736.v5i1.5841

Abstract

Pada penelitian ini dibandingkan aktivitas pereduksi NH2OH.HCl dan C6H8N2 dalam mereduksi Fe3+ menjadi Fe2+. Variasi yang dilakukan adalah pH buffer asetat optimum, waktu pembentukan kompleks optimum, dan konsentrasi pereduksi optimum dalam penentuan kadar besi (Fe) dengan menggunakan spektrofotometer UV-VIS. λmaks kompleks [Fe(C12H8N2)3]2+ dengan menggunakan pereduksi NH2OH.HCl dan C6H8N2 sebesar 510 nm. Penentuan pH buffer asetat optimum dengan pereduksi NH2OH.HCl diperoleh pH   4,5 dan pereduksi C6H8N2 diperoleh ph 3. Penentuan waktu pembentukan kompleks optimum dengan pereduksi NH2OH.HCl diperoleh pada waktu 15 menit dan pereduksi C6H8N2 diperoleh pada waktu 30 menit. Selanjutnya, dilakukan penentuan konsentrasi optimum dengan pereduksi NH2OH.HCl didapatkan pada 8 ppm dan pereduksi C6H8N2 didapatkan pada 80 ppm untuk mereduksi 5 ppm larutan Fe3+. Hasil %recovery yang diperoleh dari pereduksi NH2OH.HCl dan C6H8N2 secara berturut-turut sebesar 95,126% dan 153,090%.
Co-Authors Dhita Ariyanti Fredy Kurniawan Praditya Bagaskara