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Dissipation of monosodium methane arsonate (MSMA) on peanuts
Kevin L Armbrust1, David C Bridges
1Department of Crop and Soil Science, Weed Sciences Building, University of Georgia-Georgia Station, 1109 Experiment Street, Griffin, Georgia 30223-1797,USA. kdarmburst@msn.com
Journal of Agricultural and Food Chemistry
|March 21, 2002
Summary
Monosodium methane arsonate (MSMA) herbicide residues, specifically methylarsonic acid (MAA), were detected in mature peanut kernels after foliar application. However, MSMA did not appear in peanuts grown in rotation after MSMA-treated cotton.
Area of Science:
- Environmental Chemistry
- Agricultural Science
- Toxicology
Background:
- Monosodium methane arsonate (MSMA) is a widely used herbicide.
- Concerns exist regarding arsenic residues in crops from herbicide use.
- Understanding MSMA's fate in crops like peanuts is crucial.
Purpose of the Study:
- To investigate the fate of MSMA applied to peanut foliage.
- To quantify methylarsonic acid (MAA) and total arsenic in peanut kernels.
- To assess MAA uptake in peanuts from rotational cropping.
Main Methods:
- Field experiments applying MSMA to peanut foliage at varying rates.
- Leaf and mature peanut kernel sampling for MAA and total arsenic analysis.
- Confined rotational crop experiment with MSMA-treated soil.
Main Results:
- MSMA recovery from leaves decreased rapidly but was minimally impacted by irrigation.
- Quantifiable MAA persisted on leaves one week post-application and after irrigation.
- MAA and total arsenic were found in peanut kernels from treated plots; none detected in controls.
- No MAA residues were detected in peanuts from the rotational crop experiment.
Conclusions:
- Foliar MSMA application can lead to arsenic residues in peanut kernels.
- Irrigation has a limited effect on MSMA dissipation from peanut leaves.
- Peanut cultivation following MSMA-treated cotton does not appear to result in detectable MAA residues.