Iron fractionation for corrosion products from natural gas pipelines by continuous-flow sequential extraction

Kaewkhomdee, Nattikarn; Kalambaheti, Chatvalee; Predapitakkun, Somrudee; Siripinyanond, Atitaya; Shiowatana, Juwadee

Iron fractionation for corrosion products from natural gas pipelines by continuous-flow sequential extraction

2006

Kaewkhomdee, Nattikarn | Kalambaheti, Chatvalee | Predapitakkun, Somrudee | Siripinyanond, Atitaya | Shiowatana, Juwadee

The forms and quantities of iron species in corrosion product samples from natural gas pipelines were examined, using a continuous-flow sequential extraction system. Sequential extraction consists of four steps that dissolve water soluble iron (FeSO₄), acid soluble iron (FeCO₃), reducible iron (Fe-(oxyhydr)oxides) and oxidisable iron (FeS₂) fractions, respectively. Selectivity of extracting reagents for particular iron species was evaluated by determination of co-extracted anions, using ion chromatography, and evolved CO₂, using indirect flame atomic absorption spectrometer (FAAS). Iron was found predominantly in the reducible fraction (61–99%), indicating that Fe-(oxyhydr)oxides are the major constituents of the corrosion products.

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