About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in JEQ

  1. Vol. 34 No. 1, p. 336-341
     
    Received: May 13, 2004
    Published: Jan, 2005


    * Corresponding author(s): jgan@ucr.edu
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/jeq2005.0336

Degradation of N-Nitrosodimethylamine (NDMA) in Landscape Soils

  1. W. C. Yanga,
  2. J. Gan *a,
  3. W. P. Liub and
  4. R. Greena
  1. a Department of Botany and Plant Sciences, University of California, Riverside, CA 92521
    b Institute of Environmental Science, Zhejiang University, Hangzhou 310029, China

Abstract

N-nitrosodimethylamine (NDMA), a potential carcinogen, was commonly found in treated wastewater as a by-product of chlorination. As treated water is increasingly used for landscape irrigation, there is an imperative need to understand the leaching risk for NDMA in landscape soils. In this study, adsorption and incubation experiments were conducted using landscape soils planted with turfgrass, ground cover, and trees. Adsorption of NDMA was negligibly weak (K d < 1) in all soils, indicating that NDMA has a high potential for moving with percolating water in these soils. Degradation of NDMA occurred at different rates among these soils. At 21°C, the half-life (t 1/2) of NDMA was 4.1 d for the ground cover soil, 5.6 d for the turfgrass soil, and 22.5 d for the tree soil. The persistence was substantially prolonged after autoclaving or when incubated at 10°C. The rate of degradation was not significantly affected by the initial NDMA concentration or addition of organic and inorganic nutrient sources. The relative persistence was inversely correlated with soil organic matter content, soil microbial biomass, and soil dehydrogenase activity, suggesting the importance of microorganisms in NDMA degradation in these soils. These results suggest that the behavior of NDMA depends closely on the vegetation cover in a landscape system, and prolonged persistence and increased leaching may be expected in soils with sparse vegetation due to low organic matter content and limited microbial activity.

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

Copyright © 2005. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyASA, CSSA, SSSA