Free Iron Oxides: Rapid Determination Utilizing X‐ray Spectroscopy to Determine Iron in Solution

Publisher Website
Google Scholar
Abstract
X‐ray spectroscopy is a convenient and rapid way of measuring iron in solution, especially employing the inverted type spectrographs and cells sealed with mylar film for presenting the liquid in the spectrograph. These techniques were adapted to measuring free iron extracted by the citrate‐bicarbonate‐dithionite method and could easily be adapted to measuring iron in other extractants. The spectrograph is sensitive to iron over a range of several thousand µg/ml and gives a linear response up to at least 500 µg/ml. Colorimetric methods are only sensitive in the 0 to 4 µg/ml and atomic absorption is normally used over a 0 to 20 µg/ml range. Thus extracts normally must be diluted for colorimetric or atomic absorption, but not for x‐ray spectrographic, iron determination. Also the oxidation state of the iron is critical with colorimetric or titrimetric iron determination, but not with the x‐ray method. Determinations on the same extracts by Hsu's thiocyanate colorimetric method for soils representing a range of free iron contents.

This publication has 0 references indexed in Scilit: