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The new hydrochemical data collected during August 2018 cruise from Yakutsk to Kyusyur, in the middle and lower reaches of the Lena River, are presented. Field and laboratory data were collated into a database containing 80+ parameters, notably stable water isotopes, suspended sediment concentration and dissolved organic carbon. Presented results allow the quantitative assessment of fluxes of dissolved and suspended material toward the Lena River delta, and the deduction of the regularities of transformation of these fluxes.

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