The different behaviors of glyphosate and AMPA in compost-amended soil
Language English Country England, Great Britain Media print-electronic
Document type Journal Article
PubMed
29772427
DOI
10.1016/j.chemosphere.2018.05.004
PII: S0045-6535(18)30846-4
Knihovny.cz E-resources
- Keywords
- Aminomethylphosphonic acid, Compost, Metabolite, Moisture, Saturated hydraulic conductivity, glyphosate,
- MeSH
- Glycine analogs & derivatives chemistry MeSH
- Glyphosate MeSH
- Composting methods MeSH
- alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid chemistry MeSH
- Soil Pollutants analysis chemistry MeSH
- Soil chemistry MeSH
- Tandem Mass Spectrometry methods MeSH
- Publication type
- Journal Article MeSH
- Names of Substances
- Glycine MeSH
- alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid MeSH
- Soil Pollutants MeSH
- Soil MeSH
The broad-spectrum herbicide glyphosate is one of the most widely used pesticides. Both glyphosate and its major metabolite, aminomethylphosphonic acid (AMPA), persist in waters; thus, their environmental fates are of interest. We investigated the influence of compost dose, sampling depth, moisture and saturated hydraulic conductivity (Ks) on the persistence of these substances. The amounts of AMPA quantified by triple quadrupole liquid chromatography-mass spectrometry (LC-QqQ-MS/MS) using isotopically labeled extraction standards were higher than those of glyphosate and differed among the samples. Both glyphosate and AMPA showed gradually decreasing concentrations with soil depth, and bootstrapped ANOVA showed significant differences between the contents of glyphosate and AMPA and their behavior related to different compost dosages and sampling depths. However, the compost dose alone did not cause significant differences among samples. Bayesian statistics revealed that the amounts of glyphosate and AMPA were both dependent on the sampling depth and compost dose, but differences were found when considering the physical factors of Ks and moisture. Glyphosate was influenced by moisture but not Ks, whereas AMPA was influenced by Ks but not moisture. Importantly, we found behavioral differences between glyphosate and its major metabolite, AMPA, related to the physical properties of Ks and moisture.
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