对邻菲咯啉法测定循环水总铁含量时影响因素—pH、器皿的处理方式、盐酸羟胺的加入顺序、缓冲溶液、加热时间等条件进行了研究。结果表明，pH必须控制在2～7范围内，所用器皿必须用盐酸浸泡，样品测试过程中事先加入盐酸羟胺再煮沸可以使Fe³⁺还原的更彻底，并能消除强氧化剂影响。

The facto rs which affect the determination of to tal iron content in circulating water by o - phenan-throline are studied.the f actors are the pH, the vessels and the order of adding oxammonium hy drochloride, etc.the results show thathe pH must be controlled between 2～7, all vessels must be soaked in hydrochlo ricacid for 40 minutes.Add oxammonium hy drochloride before the ci rculating water is boiled.In this case.