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NO2 and natural organic matter affect both soot aggregation behavior and sorption of S-metolachlor Soot is an important carbonaceous nanoparticle CNP frequently found in natural environments.
Pristine soot is likely to rapidly undergo aggregation and subsequent sedimentation in aquatic environments. During atmospheric transport, soot can be chemically transformed by reactive oxygen species including NO2.
The presence of natural organic matter NOM in surface waters can further affect the aquatic fate of soot. To better understand the processes driving the fate of soot and its interactions with contaminants, pristine and NO2-transformed model soot suspensions were investigated in the presence and absence of NOM.
We used natural stable isotopes, elemental analyses, and stable isotope probing to study the ecological stoichiometry of a lucinid symbiosis in spring and fall. Chemoautotrophy appeared to dominate in fall, when chemoautotrophic carbon fixation rates were up to one order of magnitude higher as compared with the spring, suggesting a flexible nutritional mutualism.
In fall, an isotope pool dilution experiment revealed carbon limitation of the symbiosis and ammonium excretion rates up to tenfold higher compared with fluxes reported for nonsymbiotic marine bivalves. These results provide evidence that lucinid bivalves can contribute substantial amounts of ammonium to the ecosystem.
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Data from two soil cores revealed that the initial HgCl2was partly reduced to metallic Hg 0 and that Hg forms of different mobility and oxidation state coexist in the subsurface. Other sample signatures varied significantly with depth and between SEP pools. Sequential water extracts revealed slow dissolution kinetics of mobile Hg pools, continuously releasing isotopically heavy Hg into solution.
Our results demonstrate that the Hg isotope signature of an industrial contamination source can be significantly altered during the transformations of Hg species in the subsurface, which complicates source tracing applications but offers the possibility of using Hg isotopes as process tracers in contaminated subsurface systems.
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