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您的检索式：作者名="Jan SCHWARZBAUER"
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| 1 | Degradation of the fungicide metalaxyl and its non-extractable residue formation in soil clay and silt fractions显示文摘The proportion of organic matter and mineral composition are important factors determining the formation and type of non-extractable residues(NERs) of pesticides in soil. In this study, we investigated the enantioselectivity in degradation and NER formation of the chiral fungicide metalaxyl in soil particle size fractions(silt and clay). Microbial and extracellular enzyme activities during these processes were monitored in incubation of silt and clay samples isolated from sterilized and non-sterilized soil samples collected from a long-term agricultural field experimental site in Ultuna, Sweden. The temporal influence on the fate of the fungicide was noted by short-term(10-d) and long-term(92-d) incubations. Besides the acquisition of quantitative data with gas chromatography-mass spectrometry(GC/MS), stereoselective analyses were performed with chiral GC/MS. Quantitative results pointed to a higher metabolism rate of the pesticide through microbial activity than through extracellular enzyme activity. This was also confirmed by the enantioselective depletion of R-metalaxyl and the subsequent formation of R-metalaxyl acid in microbially active samples from non-sterilized soil. The silt fraction containing a high amount of organic matter exhibited a significant hydrolyzable proportion of metalaxyl NERs that was releasable under alkaline conditions. On the contrary, the clay fraction showed an enhanced affinity for covalently bound residues. Based on our results, we recommend differentiating between reversibly and irreversibly bound proportions of pesticides in persistence and environmental risk assessment because the reversible fraction contained potentially bioavailable amounts of residues that may be released under natural conditions. | Roschni KALATHOOR Jens BOTTERWECK Andreas SCHÄFFER Burkhard SCHMIDT Jan SCHWARZBAUER | 2021 | Pedosphere2021，31，4： | 1 |
| 2 | Organic geochem- istry of the Lower Suban coal seam, South Sumatra Basin, Indone- sia: Palaeoecological and thermal metamorphism implications 显示文摘 | Hendra Amijaya Jan Schwarzbauer Ralf Littke | 2006 | Organic Geochemistry2006，37，3： | 1 |
| 3 | Source and turnover of organic matter in agricultural soils derived from n-alkane/n-carboxylic acid compositions and C-isotope signatures 显示文摘 | Wiesenberg Guido L B Schwarzbauer Jan Schmidt Michael W I | 2004 | Organic Geochemistry2004，35，1112： | 1 |
| 4 | Toxicity, dioxin-like activities, and endocrine effects of DDT metabolites—DDA, DDMU, DDMS, and DDCN显示文摘 | Bernhard Wetterauer Mathias Ricking Jens C. Otte Arnold V. Hallare Andrew Rastall Lothar Erdinger Jan Schwarzbauer Thomas Braunbeck Henner Hollert | 2012 | Environmental Science and Pollution Research2012，，2： | 1 |
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