Microbial Turnover of Glyphosate to Biomass: Utilization as Nutrient Source and Formation of AMPA and Biogenic NER in an OECD 308 Test

被引:22
作者
Brock, Andreas Libonati [1 ]
Rein, Arno [2 ]
Polesel, Fabio [1 ,4 ]
Nowak, Karolina M. [3 ]
Kaestner, Matthias [3 ]
Trapp, Stefan [1 ]
机构
[1] Tech Univ Denmark, Dept Environm Engn, Bygningstorvet 115, DK-2800 Lyngby, Denmark
[2] Tech Univ Munich, Chair Hydrogeol, Arcisstr 21, D-80333 Munich, Germany
[3] UFZ Helmholtz Ctr Environm Res, Dept Environm Biotechnol, Permoserstr 15, D-04318 Leipzig, Germany
[4] DHI AS, Agern Alle 5, DK-2970 Horsholm, Denmark
关键词
PHOSPHONATE HERBICIDE GLYPHOSATE; AMINOMETHYLPHOSPHONIC ACID AMPA; WATER-SEDIMENT SYSTEMS; ENVIRONMENTAL CHEMICALS; PESTICIDE-RESIDUES; BOUND RESIDUES; DEGRADATION; SOIL; BIODEGRADATION; PHOSPHATE;
D O I
10.1021/acs.est.9b01259
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Environmental fate assessment of chemicals involves standardized simulation tests with isotope-labeled molecules to balance transformation, mineralization, and formation of nonextractable residues (NER). Methods to predict microbial turnover and biogenic NER have been developed, having limited use when metabolites accumulate, the chemicals are not the only C source, or provide for other macroelements. To improve predictive capability, we extended a recently developed method for microbial growth yield estimation to account for incomplete degradation and multiple-element assimilation and combined it with a dynamic model for fate description in soils and sediments. We evaluated the results against the unique experimental data of C-13(3)-N-15 co-labeled glyphosate turnover with AMPA formation in water-sediment systems (OECD 308). Balancing C-13- and N-13-fluxes to biomass showed a pronounced shift of glyphosate transformation from full mineralization to AMPA formation. This may be explained by various hypotheses, for example, the limited substrate turnover inherent to the batch conditions of the test system causing microbial starvation or inhibition by P release. Modeling results indicate initial N overload due to the lower C/N ratio in glyphosate compared to average cell composition leading to subsequent C demand and accumulation of AMPA.
引用
收藏
页码:5838 / 5847
页数:10
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