HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Fanning, D. S. Articles by Coffman, C. B. Search for Related Content PubMed Articles by Fanning, D. S. Articles by Coffman, C. B. Agricola Articles by Fanning, D. S. Articles by Coffman, C. B.

Free Iron Oxides: Rapid Determination Utilizing X-ray Spectroscopy to Determine Iron in Solution¹

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.

¹ Scientific Article no. A1596 and Contribution no. 4315 of the Maryland Agri. Exp. Sta., Dept. of Agronomy. College Park, Md., 20742. Presented before Div. S-9, Soil Science Society of America, at Detroit, Mich., Nov. 10, 1969.

² Associate Professor of Soil Science and graduate students, respectively. Second author is presently in U.S. Army and third author is a graduate assistant.