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Variation in Total Dissolved Iron Output and Iron Species During Extreme Rainfall Events
Author(s) -
Guan Jiunian,
Yan Baixing,
Wang Lixia,
Zhu Hui,
Cheng Long
Publication year - 2016
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201400573
Subject(s) - environmental science , water quality , hydrology (agriculture) , nitrate , surface runoff , environmental chemistry , drainage basin , genetic algorithm , riparian zone , cycling , chemistry , ecology , biology , geology , geography , geotechnical engineering , cartography , habitat , archaeology
Due to climate changes, the occurrence of extreme rainfall events (EREs) has been increasing worldwide and is expected to affect the output of total dissolved iron (TDFe) significantly. EREs occurred in the Songhua River Basin in 2013. To study the effects of EREs on the TDFe output and iron species, water samples were collected to analyze both TDFe concentration and the water quality. Filtration and ultrafiltration methods were employed to analyze the iron speciation according to the molecular weights of the TDFe species. The results showed that the TDFe concentration ranged from 0.46 to 1.10 mg/L (0.69 mg/L on average), and was increased significantly compared with that observed during the regular flood seasons from 2008 to 2012. The TDFe output reached 3.59 × 10 4 tons during EREs, almost equal to the annual output level in the Songhua River. Species analysis indicated that complexed iron at a low‐molecular‐weight was the dominant species during the EREs. The impulse of the TDFe output can be attributed to a hydrological connection to riparian wetlands and iron‐rich terrestrial runoff, and it may exert an influence on the water quality and alter the transport and cycling of other chemicals (e.g., trace elements, nitrogen, and phosphate) in the Songhua River.