Mineralization potential of atrazine and degradation intermediates from clustered characteristics in inoculated soils

D. L. Tyess, P. J. Shea, A. M. Parkhurst

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Soil properties impact pesticide persistence. Because these characteristics operate together in situ, identification of their clustered associations can help explain pesticide fate. Factor analysis was used to reduce the dimensionality of soil characteristics by grouping them into clustered independent factors, which were then related to the mineralization of atrazine and selected degradation intermediates. A Sharpsburg silty clay loam, Ortello sandy loam, and Hord silt loam were inoculated with a Hord soil that had a high capacity for atrazine mineralization. The soils were spiked with 14 C-radiolabeled atrazine, deethylatrazine, hydroxyatrazine, N-isopropylammeline, N-isopropylammelide or cyanuric acid and sampled during incubation for 80 d (atrazine) or 40 d (degradation intermediates) at 22°C. Low mineralization in uninoculated soils demonstrated that the absence of atrazine-mineralizing microorganisms was most limiting. In inoculated soils, regression analysis indicated mineralization of atrazine (R 2 = 0.88) and its degradation intermediates (R 2 ≥ 0.89) was related to factors associated with bioavailability and microbial activity. For atrazine, this relationship indicated mineralization may be positively influenced by higher pH and available phosphorus, lower NO 3 -N, organic carbon and clay contents, and lower adsorption. Our results show how factor analysis can be used in conjunction with multiple regression to determine mineralization potential and thus help identify soils with limited degradation capacities and possible long-term persistence.

Original languageEnglish (US)
Pages (from-to)87-102
Number of pages16
JournalSoil and Sediment Contamination
Volume15
Issue number1
DOIs
Publication statusPublished - Jan 1 2006

    Fingerprint

Keywords

  • Atrazine
  • Factor analysis
  • Microbial degradation
  • Mineralization
  • Multiple regression

ASJC Scopus subject areas

  • Environmental Chemistry
  • Soil Science
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this