现场离子交换研究调查了加利福尼亚州麦克法兰和汉福德以及新墨西哥州阿尔伯克基的饮用水中砷（V）[AS（V）]和硝酸盐的联合去除。以前的离子交换工人曾研究过在不存在硝酸盐的情况下去除高浓度As（>50 ug/L As），但这些研究的重点是去除10-15 ug/L As，以获得含<2 ug/L As的产品水，同时将硝酸盐保持在其最大污染水平以下。1-in.的结果-（25mm-）柱实验表明，传统的硫酸盐选择性树脂比特殊的硝酸盐选择性树脂对砷（V）和硝酸盐的联合去除效果更好。传统树脂的运行长度更长，向产品水中泄漏的砷和硝酸盐更少。 将空床接触时间从3.0分钟减少到1.5分钟，不会对产品水的泄漏造成很大影响。离子交换进料中的颗粒铁随着产品水中的泄漏而增加。两个商用计算机程序在预测各种进水硝酸盐和硫酸盐浓度下的As和硝酸盐运行长度方面相当准确。一般来说，预测的砷和硝酸盐运行长度在实验观察值的35%以内。包括25个参考文献、表格和图表。

On-site ion exchange studies investigated the combined removal of arsenic (V) [AS(V)] and nitrate from drinking water in McFarland and Hanford, California, and Albuquerque, New Mexico. Whereas previous ion exchange workers had studied removal of high concentrations of As (>50 ug/L As) without nitrate present, these studies focused on removing 10-15 ug/L As to achieve a product water with <2 ug/L As while also maintaining nitrate below its maximum contaminant level. Results of 1-in.-(25-mm-) column experiments showed that conventional sulfate-selective resins were better than special nitrate-selective resins for combined As(V) and nitrate removal. The conventional resins yielded longer run lengths and leaked less As and nitrate into the product water. Decreasing empty bed contact time from 3.0 to 1.5 min did not greatly alter As leakage into the product water. Particulate iron in the ion exchange feed increased As leakage in the product water. Two commercially available computer programs were reasonably accurate in predicting both As and nitrate run lengths for various influent nitrate and sulfate concentrations. Generally, predicted As and nitrate run lengths were within ¿35 percent of those observed experimentally. Includes 25 references, tables, figures.