@article{fdi:010057073,
  title = {{I}ron organic speciation determination in rainwater using cathodic stripping voltammetry},
  author = {{C}heize, {M}. and {S}arthou, {G}. and {C}root, {P}. {L}. and {B}ucciarelli, {E}va and {B}audoux, {A}. {C}. and {B}aker, {A}. {R}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A} sensitive method using {C}ompetitive {L}igand {E}xchange-{A}dsorptive {C}athodic {S}tripping {V}oltammetry ({CLE}-{ACSV}) has been developed to determine for the first time iron ({F}e) organic speciation in rainwater over the typical natural range of p{H}. {W}e have adapted techniques previously developed in other natural waters to rainwater samples, using the competing ligand 1-nitroso-2-naphthol ({NN}). {T}he blank was equal to 0.17 +/- 0.05 n{M} (n = 14) and the detection limit ({DL}) for labile {F}e was 0.15 n{M} which is 10-70 times lower than that of previously published methods. {T}he conditional stability constant for {NN} under rainwater conditions was calibrated over the p{H} range 5.52-6.20 through competition with ethylenediaminetetraacetic acid ({EDTA}). {T}he calculated value of the logarithm of beta'({FE}3+({NN})3) increased linearly with increasing p{H} according to log beta'({FE}3+({NN})3) = 2.4 +/- 0.6 x p{H} + 11.9 +/- 3.5 (salinity =2.9, {T}= 20 degrees {C}). {T}he validation of the method was carried out using desferrioxamine mesylate {B} ({DFOB}) as a natural model ligand for {F}e. {A}dequate detection windows were defined to detect this class of ligands in rainwater with 40 mu {M} of {NN} from p{H} 5.52 to 6.20. {T}he concentration of {F}e-complexing natural ligands was determined for the first time in three unfiltered and one filtered rainwater samples. {O}rganic {F}e-complexing ligand concentrations varied from 104.2 +/- 4.1 n{M} equivalent of {F}e({III}) to 336.2 +/- 19.0 n{M} equivalent of {F}e({III}) and the logarithm of the conditional stability constants, with respect to {F}e3+, varied from 21.1 +/- 0.2 to 22.8 +/- 0.3. {T}his method will provide important data for improving our understanding of the role of wet deposition in the biogeochemical cycling of iron.},
  keywords = {{I}ron organic speciation ; {N}atural rainwater ; {V}oltammetry ; {I}ron-complexing natural ligand concentrations ; {C}onditional stability constants},
  booktitle = {},
  journal = {{A}nalytica {C}himica {A}cta},
  volume = {736},
  numero = {},
  pages = {45--54},
  ISSN = {0003-2670},
  year = {2012},
  DOI = {10.1016/j.aca.2012.05.011},
  URL = {https://www.documentation.ird.fr/hor/fdi:010057073},
}