Kampbell Donald H, An Youn-Joo, Jewell Ken P, Masoner Jason R
US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, PO Box 1198, Ada, OK 74820, USA.
Environ Pollut. 2003;125(2):183-91. doi: 10.1016/s0269-7491(03)00072-1.
Water quality data from 55 monitoring wells during drought conditions surrounding Lake Texoma, located on the border of Oklahoma and Texas, was compared to assess the influence of drought on groundwater quality. During the drought month of October, water table levels were three feet (0.9 m) lower compared with several months earlier under predrought climate conditions. Detection frequencies of nitrate (> 0.1 mg/l), orthophosphates (> 0.1 mg/l), chlorides (> MCL), and sulfates (> MCL) all increased during drought. Orthophosphate level was higher during drought. Largest increases in concentration were nitrate under both agriculture lands and in septic tank areas. An increase in ammonium-nitrogen was only detected in the septic tank area. The study showed that stressors such as nitrate and total salts could potentially become a health or environmental problem during drought.
为评估干旱对地下水水质的影响，对位于俄克拉荷马州和德克萨斯州边界的特克索马湖周边55口监测井在干旱期间的水质数据进行了比较。在干旱的10月份，地下水位比干旱前气候条件下的几个月前低了3英尺（0.9米）。干旱期间，硝酸盐（>0.1毫克/升）、正磷酸盐（>0.1毫克/升）、氯化物（>最大污染物浓度）和硫酸盐（>最大污染物浓度）的检出频率均有所增加。干旱期间正磷酸盐水平较高。浓度增加最大的是农田和化粪池区域的硝酸盐。仅在化粪池区域检测到铵态氮增加。研究表明，在干旱期间，硝酸盐和总盐等压力源可能会成为健康或环境问题。
