ISBN: 1234246066

[EAN: 9781234246068], Neubuch, [PU: RareBooksClub], SUBJECTS, This item is printed on demand. Paperback. 114 pages. Original publisher: Washington, DC : U. S. Dept. of Agriculture, Econom… Mehr…

[EAN: 9781234246068], Neubuch, [PU: RareBooksClub], SUBJECTS, This item is printed on demand. Paperback. 114 pages. Original publisher: Washington, DC : U. S. Dept. of Agriculture, Economic Research Service, 1999. OCLC Number: (OCoLC)43433684 Subject: Agricultural pollution -- United States. Excerpt: . . . only 1. 2 percent of the CWSs and 2. 4 percent of the 1998a ). Nitrogen is primarily a problem in brackish or rural domestic wells were estimated to contain levels salt water, where it is the limiting nutrient, while phos-above the MCL. About 3 million people ( including phorus is primarily a problem in freshwater. EPA reports that nutrient pollution is the leading cause of 43, 500 infants ) using water from CWSs and about 1. 5 million people ( including 22, 500 infants ) using rural water quality impairment in lakes and estuaries, and is wells are exposed to nitrate at levels above the MCL the second leading cause in rivers ( EPA, 1998a ). ( EPA, 1992a ). Increases in the occurrence of harmful algal blooms in coastal waters have been attributed to nutrients from A 1991 USGS study of nitrate in near-surface aquifers human-caused sources, including fertilizers ( Boesch in the midcontinental United States detected nitrate in and others, 1997 ). 59 percent of the samples taken ( Kolpin, Burkart, and Thurman, 1994 ). Concentrations greater than the Besides harming aquatic ecosystems, nitrate is also a MCL were found in 6 percent of the samples. potential human health threat. The EPA has estab-Statistical analyses indicated that the frequency of lished a maximum contaminant level ( MCL, a legal samples having concentrations greater than 3 mg l maximum long-term exposure ) in drinking water of 10 mg liter. Nitrate can be converted to nitrite in the ( believed to be the maximum level from natural sources ) was positively related to the proximity of gastrointestinal tract. In infants, nitrite may cause agricultural land, to the use of irrigation, and to fertil-methemoglobinemia, otherwise known as blue-baby izer application rates. syndrome, which prevents the transport of suf. . . This item ships from La Vergne,TN.<