Ground‐Water Contamination and Well Construction in Southeast Nebraska
Ground‐Water Contamination and Well Construction in Southeast Nebraska
复制标题
内布拉斯加州东南部的地下水污染和水井建设
DOI：
10.1111/j.1745-6584.1985.tb02776.x
复制
发表时间：
1985
期刊：
影响因子：
--
通讯作者：
R. Spalding
中科院分区：
文献类型：
--
作者：
M. Exner;R. Spalding
硝酸盐氮（NO3-N）浓度和总（TC）和粪大肠菌群（FC）密度测定地下水从268个家庭和股票威尔斯在1100平方米的内布拉斯加州东南部地区。71%的样品NO3-N浓度超过10 mg/l和/或TC浓度≥ 1/100 ml。大部分NO3-N污染来自于粪肥在谷仓和谷仓中的溶解。NO3-N含量超过8.5 mg/l的115个样品的平均δ 15 N值为+11.9%0。
只有10%的威尔斯井符合内布拉斯加州私人水井建设的标准。在这些威尔斯的4%的井中NO3-N水平超过10 mg/l，而30%的井含有一个或多个TC/100 ml。NO3-N和大肠菌群污染发生率最高的是带有开缝套管的挖掘或螺旋钻威尔斯井。两组的阳性率分别为47%和80%。
仅在构造不良的威尔斯井中检测到低水平的阿特拉津。一口井中含有甲草胺。
Nitrate-nitrogen (NO3-N) concentrations and total (TC) and fecal coliform (FC) densities were determined in ground water from 268 household and stock wells in an 1100 mi2 area of southeast Nebraska. Seventy-one percent of the samples had NO3-N concentrations above 10 mg/1 and/or TC densities ≥ 1/100 ml. Most of the NO3-N contamination is from the dissolution of manure in barnyards and corrals. The average δ15N value was + 11.9%0 for the 115 samples with NO3-N levels in excess of 8.5 mg/1.
Only 10% of the wells met Nebraska's criteria for private well construction. NO3-N levels exceeded 10 mg/1 in 4% of these wells while 30% contained one or more TC/100 ml. The highest incidence of NO3-N and coliform contamination occurred in dug or augered wells with open-jointed casing. The rates were 47% and 80%, respectively.
Low levels of atrazine were detected only in the poorly constructed wells. One well contained alachlor.