@article{PAR00028991,
  title = {{C}arbon and {M}ercury {S}table {I}sotope {F}ractionation during {A}queous {P}hotodemethylation of {CH}3{H}g},
  author = {{M}alberti-{Q}uintero, {L}. {M}. and {S}onke, {J}. {E}. and {L}agane, {C}hristelle and {L}affont, {L}. and {P}oint, {D}avid},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he photodemethylation of monomethylmercury ({CH}3{H}g) is one of the most important natural degradation processes of this toxic compound and is therefore key to understanding {H}g exposure. {T}he isotopic composition of {CH}3{H}g contains information about its sources and transformation pathways. {T}he stable isotopes of {H}g during photodemethylation of {CH}3{H}g bound to dissolved organic matter ({DOM}) have been shown to undergo unique mass-independent fractionation ({MIF}), as well as mass-dependent fractionation ({MDF}). {H}ere we present different photodegradation experiments ({DOM}, {C}l- ligands) where, in addition to {H}g isotopes and degradation kinetics, the delta 13{C} of {CH}3{H}g was analyzed by compound-specific isotope analysis ({CSIA}): purge and trap-gas chromatography-combustion-isotope ratio mass spectrometry ({PT}-{GC}-{C}-{IRMS}). {O}ur results show covariation of odd {H}g {MIF} and light {C} isotope enrichment in {CH}3{H}g photodemethylation products, with delta 13{C} fractionation factors from -5 to -16 parts per thousand, depending on the presence of {C}l- and {DOM}. {W}e also find a linear relationship between {C} {MDF} and {H}g {MIF}, indicating that both isotope effects occur during {C}-{H}g bond breaking. {W}e suggest that biota {H}g {MIF} can potentially be used to correct for photochemical {C} {MDF}, bringing us one step closer to exploring the origin of the methyl group contributing to {CH}3{H}g formation.},
  keywords = {{M}onomethylmercury ; {P}hotodegradation ; {H}g {CSIA} ; {C} {CSIA}},
  booktitle = {},
  journal = {{ACS} {ES}&{T} {W}ater},
  volume = {5},
  numero = {2},
  pages = {556--565},
  year = {2025},
  DOI = {10.1021/acsestwater.4c00416},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00028991},
}