The vulnerability of groundwater to pesticides is governed in part by sorption mechanisms in the vadose zone, commonly studied in soil but less well-known in the geological solids. To alleviate this lack of knowledge, adsorption of the herbicide S-metolachlor (SMOC) and of two of its metabolites-metolachlor ethane sulfonic acid (MESA) and metolachlor oxanilic acid (MOXA)-was studied with batch equilibrium method on seventeen surface soils and three geological solids of the vadose zone overlying a glaciofluvial aquifer. In grainsize terms, the latter three were sand for the first two samples and gravel for the third. Adsorption is ordered as follows: SMOC > > MESA > MOXA, except for one of the geological solids for which MESA adsorption was slightly higher than that of SMOC (K = 0.73 vs. 0.44 L kg). The low MOXA adsorption could only be quantified for the gravel sample (K = 0.74 L kg), which was also more reactive than all the other samples to MESA and SMOC (K = 2.08 and 28.8 L kg, respectively). Statistical multivariate tests related the highest K values for SMOC with the soils and geological solids with the highest organic-carbon and clay-fraction contents. The highest K values for MESA were found in the samples containing high oxide concentrations. Our results shed a new light on the adsorption of SMOC, MESA and MOXA suggesting that during their transfer to groundwater, pesticides and metabolites can be adsorbed in the vadose zone on both soils and geological solids.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1007/s11356-020-08579-6 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
State shifts in the deep Critical Zone drive landscape evolution in volcanic terrains.
Proc Natl Acad Sci U S A
January 2025
Department of Earth Sciences, University of Oregon, Eugene, OR 97403.
Volcanic provinces are among the most active but least well understood landscapes on Earth. Here, we show that the central Cascade arc, USA, exhibits systematic spatial covariation of topography and hydrology that are linked to aging volcanic bedrock, suggesting systematic controls on landscape evolution. At the Cascade crest, a locus of Quaternary volcanism, water circulates deeply through the upper [Formula: see text]1 km of crust but transitions to shallow and dominantly horizontal flow as rocks age away from the arc front.
View Article and Find Full Text PDFNatural hematite-derived NiFeO as a separator modification material for improved Li-S battery performance.
Chem Commun (Camb)
January 2025
Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China.
The shuttling effect of polysulfides in lithium-sulfur batteries seriously affects their performance. Herein, NiFeO derived from natural hematite is coated on a PP separator (NFO@PP), which can effectively block the shuttling of polysulfides and has strong adsorption and catalytic capabilities. The NFO@PP cell has an initial capacity of up to 1258.
View Article and Find Full Text PDFEffects of storage durations on flavour and bacterial communities in Liupao tea.
Food Chem
December 2024
Key Laboratory of Tea Science of Ministry of Education, Hunan Agricultural University, Changsha, Hunan 410128, China.
Long-term storage of Liupao tea is conducive to improving its flavour and commercial value. Although bacterial communities influence Liupao tea flavour, their impact during storage remains unclear. The aroma compounds and bacterial communities were determined by headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry (HS-SPME-GC-MS) and Illumina Nova6000 analysis.
View Article and Find Full Text PDFCoal-bearing kaolinite-based plant growth-promoting fertilizer with integrated slow-release and water-retention properties.
Sci Total Environ
January 2025
Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China.
The development of ecological fertilizers has become crucial in modern agriculture due to the increasing global population and diminishing arable land resources. Herein, a plant growth-promoting fertilizer (UKS) with dual functions of slow-release and water-retention was prepared by combining liquid-phase intercalation method and crosslinking gel method. The physicochemical properties of UKS were analyzed and its dissolution, slow-release, and water-retention properties were systematically evaluated.
View Article and Find Full Text PDFThe hidden role of heterotrophic bacteria in early carbonate diagenesis.
Sci Rep
January 2025
Ali I. Al-Naimi Petroleum Engineering Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia.
Microbial impacts on early carbonate diagenesis, particularly the formation of Mg-carbonates at low temperatures, have long eluded scientists. Our breakthrough laboratory experiments with two species of halophilic aerobic bacteria and marine carbonate grains reveal that these bacteria created a distinctive protodolomite (disordered dolomite) rim around the grains. Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) confirmed the protodolomite formation, while solid-state nuclear magnetic resonance (NMR) revealed bacterial interactions with carboxylated organic matter, such as extracellular polymeric substances (EPS).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!