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- Title
A rapid sensitive bioassay for determination of paraquat and diquat in water.
- Authors
O'Brien, Mary C.; Prendeville, G. N.
- Abstract
The change in cell-membrane permeability as indicated by leakage of electrolytes from treated fronds of <em>Lemna minor</em> was the criterion used to detect the presence of diquat and paraquat in solution. The minimum herbicide concentrations that could be detected ranged from 1.8 and 1.7 µg/ml diquat and paraquat cation respectively after 3 h treatment to 0.00018 and 0.000017 µg/ml after 72 h. Paraquat was more active than diquat in all treatments. Increase in cell-membrane permeability occurred without the appearance of injury such as, chlorosis or bleaching of fronds. Light was necessary for these herbicides to alter cell-membrane permeability, though a little herbicidal activity could be detected after 48 h in the dark at concentrations above 0.17 µg/ml.
- Subjects
CELL membranes; ELECTROLYTES; LEMNA minor; DIQUAT; PARAQUAT; HERBICIDES
- Publication
Weed Research, 1978, Vol 18, Issue 5, p301
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1978.tb01164.x