My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in SSSAJ

  1. Vol. 48 No. 2, p. 401-405
     
    Received: May 31, 1983
    Published: Mar, 1984


 View
 Download
 Alerts
 Permissions

doi:10.2136/sssaj1984.03615995004800020036x

Characterization of Iron Oxide Minerals by Second-Derivative Visible Spectroscopy1

  1. C. S. Kosmas,
  2. N. Curi,
  3. R. B. Bryant and
  4. D. P. Franzmeier2

Abstract

Abstract

Derivative spectroscopy is a technique of calculating and plotting the first, second, or higher order derivative of the spectral curve relating absorption and wavelength. The second derivative greatly enhances minor convexities and concavities of the original (zero order) spectrum and gives a much narrower band width which provides improved resolution of subtle or overlapping bands. The visible spectrum and its second derivative were determined for natural and synthetic goethite and synthetic hematite. The two minerals have distinctive second-derivative patterns. The minimum at 423 nm and the maximum at 447 nm in the second-derivative patterns were used to estimate the amount of goethite in a mixture with kaolinite. Whole soil samples can be analyzed without pretreatment by this method, assuring that the result of the analysis is a property of the soil itself and not an artifact of a pretreatment.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America

Facebook   Twitter