Determination of Trace Amounts of Total Fe as Fe(II) in Environmental Samples by Catalytic Kinetic Spectrophotometry

Year 2017, Volume: 38 Issue: 2, 373 - 384, 24.04.2017

Nuket Kartal Temel , Ramazan Gürkan

https://doi.org/10.17776/cumuscij.302489

Abstract

The method is based on the selective catalytic effect of iron (II) ions
in the presence of 1,10-phenanthroline as an activator, on the oxidation of Coomassie Brillant Blue 2R by bromate. The
catalytic reaction was monitored spectrophotometrically at 520 nm by fixed time
approach of 3 min. The optimization of the operating conditions are
investigated. Obtained optimum conditions: 1.5 mL of Coomassie Brillant
Blue 2R (1.0 x 10^-4 mol L^-1), 0.6 mL of bromate (0.01 mol
L^-1), 1.5 mL of 1,10-phenanthroline (1.0 x 10^-3 mol L^-1),
reaction temperature 25^oC and time 3 min in pH 2.0 at 520 nm. The
proposed method allows quantitatively
determination of iron (II) in the range of 0.05-5 mg L^-1 with a
selectivity and quantification limit of 0.0141 and 0.047 mg L^-1. The
relative standard deviations for five replicate determinations of 0.2 and 3 mg
L^-1 iron (II) are
3.8% and 2.3%, respectively. The method was applied to determination of total iron
in some environmental surface waters such as lake, river and well water
including pharmaceutical samples used in the treatment of iron deficiency (such
as ferrosolanol and maltose) after pre-reduction of iron (III) to iron (II)
with sulfite at 40 ^oC at pH 4.0, and quantitative percentages of
retinas ranging from 98.7-102.7% were obtained by standard attachment-based
analysis after wet acid dissolution for possible matrix effect.

Keywords

Iron (II), Bromate, Coomassie Brillant Blue 2R, Kinetic method, 1.10-Phenanthroline

Katalitik Kinetik Spektrofotometri ile Çevresel Örneklerde Eser Miktarlardaki Toplam Fe'nin Fe(II) Olarak Belirlenmesi

Abstract

Yöntem, Coomassie Brillant Blue 2R’nin bromat ile oksidasyonuna,
aktivatör olarak 1,10-fenantrolin varlığında demir (II) iyonlarının seçici
katalitik etkisine dayanır. Katalitik tepkime yaklaşık 3 dakikalık
sabitlenmiş-zaman yaklaşımı ile 520 nm’de spektrofotometrik olarak izlenmiştir.
Uygulama koşullarının optimizasyonu araştırılmıştır. Elde edilen
optimalkoşullar: 1.5 mL Coomassie Brillant Blue 2R (1.0 × 10^-4 mol L^-1),
0.6 mL bromat (0.01 mol L^-1), 1.5 mL 1,10-fenantrolin (1.0 × 10^-3
mol L^-1), 25 ^oC tepkime sıcaklığı and pH 2.0 de, 520
nm’de 3 dakikalık tepkime zamanıdır. Önerilen yöntem, 0.0141 mg L^-1 ve
0.047 mg L^-1 lik seçme ve nicelleştirme sınırı ile 0.05-5 mg L^-1
aralığında demir (II)’nin tayinine izin verir. 0.2 ve 3 mg L^-1
demir (II)’nin beş tekrarlı analizi
için elde edilen bağıl standart sapma değerleri sırasıyla %3.8 ve %2.3 tür.
Yöntem, pH 4.0 ve 40 ^oC’de sülfit ile demir (III)’ün demir
(II)’ye ön indirgenmesi sonrası demir eksikliği
tedavisinde kullanılan farmasötik örnekler (ferrosolanol ve maltoz gibi) ve
göl, nehir ve kuyu suyu gibi bazı çevresel yüzey sularında toplam demir
tayininde uygulanmış, olası örnek matriks etkisi için yaş asitle çözme sonrası
standart eklemeye dayanan analizle %98.7-102.7 aralığında değişen kantitatif
gerikazanımlar elde edilmiştir. 

Keywords

Fe(II), Coomassie Brillant blue 2R, Bromat, 1.10-Fenantrolin, Kinetik yöntem

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