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目的 :建立一种新的快速、灵敏、准确的测定水中总铁的方法 ,以适应当前卫生检测的需要。方法 :通过查阅有关资料 ,进行了桑色素、茜素S、偶氮氯膦、菲咯嗪等显色剂的筛选、方法比较和干扰因素影响试验。结果 :经过多次试验 ,建立了维生素C还原三价铁后 ,以菲咯嗪为显色剂 ,测定水中总铁的新方法。该法最大吸收峰波长 5 6 0nm ;试验并确定了显色剂、还原剂的用量分别为 0 .1%、0 .15 % ;温度 (5～ 4 0℃ )、pH值 (3.0～ 9.0 )对显色时间和测定结果无明显影响 ;水中大部分离子对测定无明显干扰 ;回收率为 90 %～ 10 3% ;相对标准偏差为 1.4 %～ 4 .9% ;可测定浓度范围为 0 .1～ 1.0mg·L 1。结论 :实验证明 ,该方法的准确度和精密度均较好 ,适合于生活饮用水、环境水质和排放废水中总铁的快速测定
Objective: To establish a new rapid, sensitive and accurate method for the determination of total iron in water to meet the needs of current sanitary testing. Methods: By referring to the relevant data, the screening methods of morin, alizarin S, chlorophosphonazo, phenanthroline and other color reagents were compared and the influence of interference factors was tested. Results: After several experiments, a new method was established for the determination of total iron in water after the reduction of ferric vitamin C with phenanthroline as chromogenic reagent. The maximum absorption peak wavelength of this method is 560nm. The amount of reagent and reductant were tested and determined to be 0.1%, 0.15% respectively. The temperature (5 ~ 400 ℃), the pH value (3.0 ~ 9.0) There was no significant effect on the color reaction time and the determination result. Most of the ions in water did not interfere with the determination. The recoveries were 90% -103%. The relative standard deviations were 1.4% ~ 4.9%. The measurable concentration range was 0. 1 to 1.0 mg · L 1. Conclusion: The experiment proves that the method is accurate and accurate, and is suitable for rapid determination of total iron in drinking water, environmental water quality and discharge wastewater