• Home
  • Search Results
  • Reduced downward mobility of metolachlor and metribuzin from surfactant-modified clays.

Reduced downward mobility of metolachlor and metribuzin from surfactant-modified clays.

Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes (2006-01-06)
Neera Singh
ABSTRACT

The study aims to prepare the organoclay complexes of metolachlor and metribuzin so as to reduce their downward mobility in soil profile. The organoclays were preadsorbed with phenyltrimethylammonium (PTMA) (50% of cation exchange capacity [CEC]) and hexadecyltrimethylammonium (HDTMA) (100% of CEC). Four metolachlor formulations, two for each organoclay, were prepared having 1% and 2% load of herbicide and were called PTMA-Metol-1%, PTMA-Metol-2%, HDTMA-Metol-1% and HDTMA-Metol-2%. Two metribuzin formulations were prepared and were called PTMA-Metri-1% and HDTMA-Metri-1%. Soil column leaching experiment showed that compared to their commercially available formulations, organoclay complexes were effective in reducing the downward mobility of both herbicides. Organoclay complexes of metolachlor and metribuzin prepared using PTMA-Montmorillonite performed better than the HDTMA-Montmorillonite complexes.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Trimethylphenylammonium tribromide, 97%
Sigma-Aldrich
Trimethylphenylammonium chloride, ≥98%
Supelco
Trimethylphenylammonium hydroxide solution, ~0.5 M (CH3)3N(OH)C6H5 in methanol, for GC derivatization, LiChropur
Sigma-Aldrich
Trimethylphenylammonium bromide, 98%
Sigma-Aldrich
Trimethylphenylammonium hydroxide solution, ~25% in H2O (1.68 M)