@article{fdi:010095443,
  title = {{D}iffusive gradient in thin film for ultra-trace methylmercury measurements in the coastal and open sea},
  author = {{B}londet, {I}. and {R}ioual, {F}. and {G}raco, {M}. {I}. and {L}edesma, {J}. and {R}uiz-{D}iaz, {K}. and {A}guirre-{V}elarde, {A}. and {F}lye-{S}ainte-{M}arie, {J}. and {L}affont, {L}. and {H}eimbürger-{B}oavida, {L}. {E}. and {T}orres-{R}odriguez, {N}. and {B}onnet, {S}ophie and {G}uieu, {C}. and {R}aimbault, {V}. and {P}oint, {D}avid},
  editor = {},
  language = {{ENG}},
  abstract = {{M}onomethylmercury ({MMH}g) is a potent neurotoxin causing neurodevelopmental delays and cardiovascular and immunological issues. {H}uman exposure primarily occurs through seafood consumption due to {MMH}g bioaccumulation and biomagnification from seawater into marine organisms. {D}etermining {MMH}g in seawater at ultratrace concentrations poses logistical and analytical challenges. {D}iffusive {G}radient in {T}hin-film ({DGT}) samplers represent a promising solution, which captures time-averaged concentrations by preconcentrating in situ {MMH}g over a defined exposure time. {DGT} manufactured with 3-mercaptopropyl-functionalized silica (3{MFS}) in agarose and polyacrylamide gels were tested and compared for the determination of {MMH}g present in open ocean and coastal waters. {D}ifferent elution methods using acidic thiourea were tested to reach precise, accurate and quantitative elution of {MMH}g from the binding gel. {W}e found that polyacrylamide-3{MFS} binding gels display a higher elution efficiency (94 +/- 3 %), precision and better handling compared to agarose-3{MFS} gels (41 +/- 6 %). {A} unique mooring line installed in the {S}outh {W}estern {T}ropical {P}acific {O}cean, provided monthly {DGT}-{MMH}g concentrations over a year showing potential seasonal differences in {MMH}g concentrations ranging between 18 and 106 f{M}. {DGT} were also deployed in shallow {P}eruvian coastal waters, exhibiting higher {MMH}g concentrations (170 +/- 97, n = 26) with typical benthopelagic gradients. {DGT}-{MMH}g concentrations were in good agreement with discrete water samples analyzed by reference methods using isotope dilution. {DGT}s offer complementary advantages over oceanographic cruises, notably in situ preconcentration, low blanks, minimal logistical requirements and cost-effectiveness. {DGT}s represent a valuable tool for studying the marine {MMH}g cycle for evaluating the implementation of the {M}inamata {C}onvention.},
  keywords = {{DGT} ; methylmercury ; passive samplers ; coastal ocean ; open ocean ; {PACIFIQUE} ; {PEROU} ; {TONGA} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{M}arine {P}ollution {B}ulletin},
  volume = {222},
  numero = {2},
  pages = {118813 [12 p.]},
  ISSN = {0025-326{X}},
  year = {2026},
  DOI = {10.1016/j.marpolbul.2025.118813},
  URL = {https://www.documentation.ird.fr/hor/fdi:010095443},
}