Photodegradation of the herbicide glyphosate in water.
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Glycine↗
Biomedical subjects
H O Friestad
Publications and source records attributed to H O Friestad.
Automated analytical system for phenols incorporated into screening method suitable for Determination of 2-methyl-4-chlorophenoxyacetic acid and/or 2,4-dichlorophenoxyacetic acid herbicide residues in water.
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2,4-Dichlorophenoxyacetic Acid↗
Evaluation of rapid partitioning cleanup method for pesticides.
A partitioning cleanup method performed in test tubes with small solvent volumes, and using syringes instead of separatory funnels for phase separations, has been tested for potential as a general cleanup method for a variety of pesticidal compounds. More than 50% recoveries were obtained for most of the 60 compounds tested, even though minimal manipulation rather than maximum recovery was the aim. Since the recoveries usually are constant, procedural losses can be compensated for by correction factors.
Evaluation Studies as Topic↗
Method for determination of glyphosate residues in natural waters based on polarography of the N-nitroso derivative.
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Glycine↗
Rapid screening method, including automated colorimetry, for low residue levels of linuron and-or chlorpropham in vegetables.
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Amines↗
Automated steam distillation and fluorometry for screening for carbaryl as 1-naphthol in fruits and vegetables.
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Carbamates↗
Automated colorimetric microdetermination of phenols by oxidative coupling with 3-methyl-2-benzothiazolinone hydrazone.
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Autoanalysis↗
Improved polarographic method for determination of glyphosate herbicide in crops, soil, and water.
A prior method for determination of glyphosate in water samples has been modified to accommodate samples of crops and soils. Differential pulse polarography as the determinative step enables analysis in an aqueous medium, which is important during extraction of this compound. Residues are cleaned up and concentrated by ion exchange on a strong basic resin in OH- form. The method is rapid, is applicable to a relatively broad selection of sample types, and gives recoveries consistently better than 60% with good precision. The main shortcoming of the method is that the limit of detection of 0.5-1.0 ppm may sometimes be inadequate. The metabolite, aminomethyl phosphonic acid, is not detected.
Chemical Phenomena↗