Inorganic iodine incorporation into soil organic matter: evidence from iodine K-edge X-ray absorption near-edge structure

Surficial redistribution of fallout131iodine in a small temperate catchment

“…3B, Fig. S2), but is consistent with the understanding that iodine preferentially binds with and is immobilized by soil carbon (8,9,20).…”

“…In the Earth near-surface, iodine exists in multiple oxidation states ranging from −1 to þ5, which form inorganic (e.g., iodide, I − , and iodate, IO 3 − ) and organic (e.g., CH 3 I) species in gaseous (e.g., iodine, I 2 ), particle-reactive or soluble phases, all with widely divergent chemical behaviors (7) and facile interconversions. The most important iodine species in terrestrial systems are "organoiodine" (5,8), thought to be incorporated in aromatic moieties (9) but otherwise poorly characterized as to origin, reactivity, or fate. Coupled with the very low natural abundance of iodine (10), the complexity of iodine chemistry has historically challenged analytical capabilities (10, 7, 11) and continues to limit our understanding of diverse problems including the true hazards of nuclear energy production or amelioration of human iodine deficiency (12).…”

Determination of total contents of bromine, iodine and several trace elements in soil by polarizing energy-dispersive X-ray fluorescence spectrometry

“…The results corresponded to previous observations that the elements are accumulated as organically-bound forms in soil (Yu et al 1996;Yamada et al 1999Yamada et al , 2002Yamaguchi et al 2006Yamaguchi et al , 2010. Concentrations of Br and I in the soil samples from paddy fields were relatively lower than those from upland fields, which would reflect the well known fact that these elements would be leached out under the reducing condition in flooded paddy fields (Yuita et al 1982a(Yuita et al , b, 2005Muramatsu and Yoshida 1993;Yamaguchi et al 2006).…”

Eficiência De Soluções Densas No Fracionamento Físico Da Matéria Orgânica Do Solo

“…Embora existam evidências dos mecanismos envolvidos na retenção de I -à matéria orgânica (Johanson, 2000;Dai et al, 2009), seus efeitos no processo de fracionamento da MO ainda não são totalmente conhecidos. Estudo desenvolvido por Moulin et al (2001) revelou que a associação entre compostos de iodo e estruturas da MO ocorre rapidamente quando a concentração de iodo em solução é alta e depende do estágio de humificação da MO, possivelmente pela presença de grupamentos orgânicos onde o iodo se associa preferencialmente como os compostos aromáticos (Radlinger e Heumann, 2000;Schlegel et al, 2006, Yamaguchi et al 2010. A utilização de solo moído a 2 mm também aumenta a proporção da FLL em razão da liberação de material orgânico ocluso em agregados maiores que 2 mm (Tomazi et al, 2011).…”