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Boron sources and transport mechanisms in river waters collected from southwestern Taiwan Isotopic evidence

, : Boron sources and transport mechanisms in river waters collected from southwestern Taiwan Isotopic evidence. Journal of Asian Earth Sciences 58(none)

Boron (B) isotopes are sensitive tracers for constraining water-rock interactions and pollution sources in river systems. In this study, we analyzed ?11B using multi-collector inductive coupled plasma mass spectrometry, in addition to major and trace elements, to delineate B sources and transport mechanisms in two river catchments, the largest Kao-ping River and the most polluted Erren River in southwestern Taiwan. Dissolved ?11B values vary more than 35 in Kao-ping River, but keep relatively constant in Erren River, 12.2-26.7 . Four major B sources identified in these river waters are cyclic seasalt, water/rock interaction, geothermal water and anthropogenic inputs. All specimens collected near the estuaries were influenced strongly by the seawater, B=4.5 mg/L and ?11B =39.5 . The Erren River results provide unique information on B and ?11B compositions in anthropogenic sources, in particular for fertilizer and hog manure, characterized with high B (up to 3.43 mg/L) and intermediate ?11B (average 13 ). The low ?11B values in 2006 Kao-ping River are attributed to contributions from local geothermal inputs, average 2.5 ppm and 2 , prior to massive landslides caused by 2009 Morakot typhoon. Mass balance calculations suggest that major contribution of B in river waters was derived from silicate weathering, characterized by low B and intermediate ?11B, contributed approximately 49-97% in 2010 Kao-ping River. The detected changes of ?11B (?w-rock) reaches a maximum variation of 18 during chemical weathering in catchment and highlights the importance of water/rock interaction enhancement after major climatic events. Four major B sources were identified in Kao-ping and Erren river waters. Unique B and ?11B in anthropogenic sources was identified in the Erren results. Silicate weathering contributes major B in the river waters. The importance of water/rock interaction enhanced after major climatic events.


DOI: 10.1016/j.jseaes.2012.07.008

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