NDLI: Temporal variability in water quality parameters—a case study of drinking water reservoir in Florida, USA

Content Provider	Springer Nature Link
Author	Toor, Gurpal S. Han, Lu Stanley, Craig D.
Copyright Year	2012
Abstract	Our objective was to evaluate changes in water quality parameters during 1983–2007 in a subtropical drinking water reservoir (area: 7 km2) located in Lake Manatee Watershed (area: 338 km2) in Florida, USA. Most water quality parameters (color, turbidity, Secchi depth, pH, EC, dissolved oxygen, total alkalinity, cations, anions, and lead) were below the Florida potable water standards. Concentrations of copper exceeded the potable water standard of <30 μg l−1 in about half of the samples. About 75 % of total N in lake was organic N (0.93 mg l−1) with the remainder (25 %) as inorganic N (NH3-N: 0.19, NO3-N: 0.17 mg l−1), while 86 % of total P was orthophosphate. Mean total N/P was <6:1 indicating N limitation in the lake. Mean monthly concentration of chlorophyll-a was much lower than the EPA water quality threshold of 20 μg l−1. Concentrations of total N showed significant increase from 1983 to 1994 and a decrease from 1997 to 2007. Total P showed significant increase during 1983–2007. Mean concentrations of total N (n = 215; 1.24 mg l−1) were lower, and total P (n = 286; 0.26 mg l−1) was much higher than the EPA numeric criteria of 1.27 mg total N l−1 and 0.05 mg total P l−1 for Florida’s colored lakes, respectively. Seasonal trends were observed for many water quality parameters where concentrations were typically elevated during wet months (June–September). Results suggest that reducing transport of organic N may be one potential option to protect water quality in this drinking water reservoir.
Starting Page	4305
Ending Page	4320
Page Count	16
File Format	PDF
ISSN	01676369
Journal	Environmental Monitoring and Assessment
Volume Number	185
Issue Number	5
e-ISSN	15732959
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-09-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Lake management Nitrogen Phosphorus Temporal variability Water quality Environmental Monitoring/Analysis Environmental Management Ecotoxicology Atmospheric Protection/Air Quality Control/Air Pollution Ecology
Content Type	Text
Resource Type	Article
Subject	Pollution Medicine Management, Monitoring, Policy and Law

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