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Contrasting Chemical Response To Experimental Acidification Of Five Acid-Sensitive Streams, Heather Vanessa Goss
Contrasting Chemical Response To Experimental Acidification Of Five Acid-Sensitive Streams, Heather Vanessa Goss
Electronic Theses and Dissertations
To evaluate the role of stream water and substrates in response to acidification, we experimentally acidified five first-order streams in 2005: East Bear Brook, Hadlock Brook, and Mud Pond Inlet (Maine, USA); Fernow WS3 (West Virginia, USA); and Lesní Potok (Czech Republic). All have forested catchments and low alkalinity water. We evaluated water samples from a reference site above the point of hydrochloric acid addition and from two or three sites located 16 to 94 m downstream. Just before acid addition we collected streambed sediment samples for sequential extraction of metals. Several sediment-water and aqueous processes contributed to neutralization of …
A Geochemical, Isotopic, And Petrologic Study Of A Watershed With Arsenic-Enriched Ground Water In Northport, Maine, Gail Elizabeth Lipfert
A Geochemical, Isotopic, And Petrologic Study Of A Watershed With Arsenic-Enriched Ground Water In Northport, Maine, Gail Elizabeth Lipfert
Electronic Theses and Dissertations
High mean arsenic concentrations up 26.6 ¹mol/L (1990 ¹g/L) occur in ground water within a watershed at Kelly's Cove, Northport, Maine, USA. The Kelly's Cove watershed is a fractured-bedrock system composed of sul¯dic schist with granitic to dioritic intrusions. Arsenic is enriched in these rocks up to 1050 mg kg¡1 (average: 68 mg kg¡1). The distribution of arsenic in the bedrock appears to be controlled by the presence of arsenopyrite and arsenian pyrite, that occur primarily in post-metamorphic, tourmaline + quartz § carbonate veins and the Kelly's Cove granite. Based on the metamorphic signature of the tourmaline chemistry and the …