About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in SSSAJ

  1. Vol. 44 No. 6, p. 1213-1215
     
    Received: Aug 5, 1978


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2136/sssaj1980.03615995004400060016x

Carbaryl Adsorption on Calcium-Bentonite and Soils1

  1. M. I. Aly,
  2. N. Bakry,
  3. F. Kishk and
  4. A. H. El-Sebae2

Abstract

Abstract

Adsorption of carbaryl on Ca-bentonite, and two Egyptian soils, a Nile alluvial and a highly calcareous soil, was carried out at different temperatures. Carbaryl adsorption increased as the temperature decreases. Ca-bentonite exhibited the highest degree of adsorption followed by the Nile alluvial soil and the calcareous soil.

The calculated partial molar heat of adsorption ΔH* for bentonite, alluvial and calcareous soils were −3.8, −0.924 and −10.282 kcal/mol, respectively, indicating that adsorption may be physical in nature. The ΔG* values of the three systems were −0.570, −0.118, and −0.346 kcal/mol, respectively, indicating that the adsorption reaction was spontaneous in all cases. The adsorption data followed the Freundlich adsorption equation. The entropy values for the adsorption of carbaryl by the three adsorbents were −15.0, −36.7, and −8.0 entropy units indicating that carbaryl adsorption is favored by the alluvial soil that contains the highest organic matter content.

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

Copyright © . Soil Science Society of America