Influences of Land Use on Water Quality of a Diverse New England Watershed
Analysis of variations in major ion chemistry in the Mill River watershed reveals the importance of anthropogenic activities in controlling streamwater chemistry. Average concentrations of NO3 - and SO4 2- show a positive correlation with percent catchment area altered by human land uses, and concen...
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| Veröffentlicht in: | Environmental science & technology 2001-09, Vol.35 (18), p.3640-3645 |
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| creator | Rhodes, Amy L Newton, Robert M Pufall, Ann |
| description | Analysis of variations in major ion chemistry in the Mill River watershed reveals the importance of anthropogenic activities in controlling streamwater chemistry. Average concentrations of NO3 - and SO4 2- show a positive correlation with percent catchment area altered by human land uses, and concentrations of Cl- increase with road density. Water removal from municipal reservoirs increases the downstream concentration of NO3 - and SO4 2- over that predicted by land use changes, showing that removal of high quality upstream water concentrates pollutants downstream. In salt-impacted streams, Cl- exceeds Na+ by 10−15% due to cation exchange reactions that bind Na+ to soil. The net effect of nonpoint source pollution is to elevate ANC in the most developed areas, which impacts the natural acidity of a large swamp. The sum of base cations (CB) exceeds ANC for all samples. Plotting CB against ANC and subtracting Cl- quantifies the impact of road salt from the impact of the addition of strong acids. |
| doi_str_mv | 10.1021/es002052u |
| format | Article |
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Average concentrations of NO3 - and SO4 2- show a positive correlation with percent catchment area altered by human land uses, and concentrations of Cl- increase with road density. Water removal from municipal reservoirs increases the downstream concentration of NO3 - and SO4 2- over that predicted by land use changes, showing that removal of high quality upstream water concentrates pollutants downstream. In salt-impacted streams, Cl- exceeds Na+ by 10−15% due to cation exchange reactions that bind Na+ to soil. The net effect of nonpoint source pollution is to elevate ANC in the most developed areas, which impacts the natural acidity of a large swamp. The sum of base cations (CB) exceeds ANC for all samples. 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| subjects | Applied sciences Chemistry Continental surface waters Creeks & streams Earth sciences Earth, ocean, space Engineering and environment geology. Geothermics Environmental Monitoring Exact sciences and technology Freshwater Humans Hydrogen-Ion Concentration Ions Ions - analysis Land use Motor Vehicles Natural water pollution New England Pollution Pollution, environment geology USA, northeast, Mill R Water - chemistry Water Pollutants - analysis Water pollution Water treatment and pollution |
| title | Influences of Land Use on Water Quality of a Diverse New England Watershed |
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