Diel Variation of Trace Metals in the Upper Clark Fork River, Montana
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- 作者：Christine M. Brick and Johnnie N. Moore
- 刊名：Environmental Science & Technology
- 出版年：1996
- 出版时间：June 1996
- 年：1996
- 卷：30
- 期：6
- 页码：1953 - 1960
- 全文大小：589K
- 年卷期：v.30,no.6(June 1996)
- ISSN：1520-5851
文摘
Hourly sampling of an oxic, slightly alkaline riverwith high concentrations of trace metals stored in bedand flood plain sediments reveals diel cycles indissolved Mn and Zn and acid-soluble particulate Al,Fe, Mn, Cu, and Zn. Metal concentrations increase2-3-fold at night as pH and dissolved oxygen decrease.Dissolved Mn and Zn cycles may be the result ofredox reactions in river-bed sediments or variationsin influx of water from the hyporheic zone as aresult of evapotranspiration. Increased particulatemetal concentrations result from an increase in totalsuspended matter at night. Particulate metalconcentrations decrease several hours before thedecline of dissolved concentrations in the morning.Majorelements and ions including Ca, Mg, Na, Si,Cl-,SO42-, and total alkalinity showno evidence of dielvariation. The results have implications for monitoring and assessment of reclamation because theyshow that daytime sampling underestimates theflux of metals in the river.