Pitre,F. and Pinti,D.L.(2010): Noble gas enrichments in porewater of estuarine sediments and their effect on the estimation of net denitrification rates. Geochimica et Cosmochimica Acta, 74, 531-539.

『河口多堆積物の孔隙水中の貴ガス濃集およびそれらが正味の脱窒速度の見積りに与える影響』


Abstract
 The concentration and the isotopic ratios of noble gases He, Ne, Ar, Kr and Xe were measured in porewater trapped in shallow sediments of the estuary of the St-Lawrence River, Quebec(最初のeの頭に´), Canada. The gases are atmospheric in origin but most samples have gas concentrations 1.7-28 times higher than those expected in solution in water at equilibrium with the atmosphere. Elemental fractionation of heavier noble gases Kr and Xe compared to Ar strongly suggests that noble gases were desorbed on sediments or organic matter and then desorbed into porewaters due to depressurization, as collected samples were brought to the surface. Atmospheric Ar in porewater is used as a reference to measure the N2-fluxes at the water-sediment interface. Ignoring the Ar enrichments observed in porewater could lead to a severe underestimation of the denitrification rate in oceans and estuaries.』

1. Introduction
2. Sampling and analytical methods
3. Results
4. Discussion
5. Conclusions
Acknowledgments
References


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