Iron is an essential mineral and one of the most abundant in soils, presenting itself in the environment as ferrous and ferric ions. As each oxidation state of iron has a different role in the environment, its speciation in environmental studies is important. The determination of ferrous iron received great attention from soil chemists because of its important role in agriculture, in redox processes, and as an electron acceptor in the catalysis of organic matter. Methodologies with the use of colorimetric reagents to determine ferrous iron are divergent and not very clear. In this study, we compared two colorimetric reagents (1,10-phenanthroline and ferrozine) to determine the total concentration of iron, ferrous and ferric ions in soil, using simple and low-cost methodologies. The determination of ferrous and total iron with 1,10-phenanthroline colorimetric reagent, following published instructions, did not correlate with ferrozine method, presenting an erroneous quantification. After neutralizing the extract of 1,10-phenanthroline with NaOH, both colorimetric methods allowed to quantify with precision and high yield the amount of ferrous and total iron extracted from the soil. The oxidation states of iron have a different contribution and importance to the environment. In this sense, the improvement of a widely used methodology is crucial for the better study of iron speciation in soil.
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This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001 (process no. 88882.306808/2018-01) and pro-equipment project (proposal no. 189683) CAPES no. 11/2014 and was supported by grants #2013/50940-0, #2016/10796-5, and #2016/16687-3, São Paulo Research Foundation (FAPESP). AAN was supported by grant #2017/03575–5, FAPESP.
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de Mello Gabriel, G.V., Pitombo, L.M., Rosa, L.M.T. et al. The environmental importance of iron speciation in soils: evaluation of classic methodologies. Environ Monit Assess 193, 63 (2021). https://doi.org/10.1007/s10661-021-08874-w
- Fe(II) quantification
- Ferrous iron