NDLI: Solutes and potential sources in a portion of the Trinity aquifer, Texas, USA

Content Provider	Springer Nature Link
Author	Hudak, Paul F.
Copyright Year	2010
Abstract	Concentrations of several solutes––arsenic, nitrate, chloride, and bromide––along with total dissolved solids (TDS) in a portion of the Trinity aquifer were compiled, mapped, and evaluated relative to regional land use and geology. Agriculture and oil/gas production are significant land uses and potential sources of groundwater contamination in the study area. Data were compiled from 60 wells with a median depth of 245 ft (75 m). Only two observations surpassed the 44.3 mg/L drinking water standard for nitrate, and no observations exceeded the 10 µg/L standard for arsenic. A statistically significant, negative correlation was apparent between nitrate and well depth. The median chloride concentration was 28.7 mg/L; however, the maximum level was more than double the secondary drinking water standard of 250 mg/L. Nearly half of the TDS observations exceeded the secondary drinking water standard of 500 mg/L. Most chloride/bromide ratios were between 100 and 300; the median value was 184. Two mapped chloride/bromide ratios above 1,000 were consistent with evaporite dissolution. Results suggest modest impacts to groundwater quality from a combination of natural and human sources, the latter potentially including agriculture and oil/gas production.
Starting Page	15
Ending Page	20
Page Count	6
File Format	PDF
ISSN	08912556
Journal	Carbonates and Evaporites
Volume Number	25
Issue Number	1
e-ISSN	18785212
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-02-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Trinity aquifer Agriculture Oil/gas production Mineralogy Mineral Resources Geology
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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