摘要
根据二价铁与邻菲哆啉显色反应的原理，试验将粉末状的氨基磺酸、邻菲哆啉、盐酸羟胺和乙酸钠依次按0．2，0．003，0．03，0．3g的比例充分混匀后，用压片机在5MPa压力下压制成直径为10mm，厚度为0．3～0．4cm的试剂片，专用于环境水体中铁的现场快速检测。使用时，于10mL水样中投入试剂片一片，摇动溶液待试剂片溶解完全后5min，在波长510nm处测量其吸光度。用铁标准溶液制作工作曲线，曲线的线性范围为0．2～4．0mg·L-1。方法的检出限（3σ）为0．07mg·L-1。对1．5mg·L-1。铁标准溶液进行6次重复测定，计算得其相对标准偏差为0．57％。应用所提出的方法测定了3种水样中的铁量，所得测定值与国家标准方法的测定值相符。
Based on the principle of color reaction of Fe（ Ⅱ ） with o-phenanthroline, a reagent tablet used specifically for rapid field analysis of water samples for iron contents was prepared and tested. Powdered reagents of sulfamic acid, o-phenanthroline, hydroxylamine hydrochloride and sodium acetate with their mass ratio of 0. 2 g ： 0. 003 g ： 0.03 g ： 0. 3 g respectively were mixed thoroughly and pressed into a tablet having its diameter of 10 mm and thickness of 0.3-0. 4 cm under a pressure of 5 MPa with a tabletting press. When in use, one piece of the tablet was added into 10 mL of water sample, measure the absorbance of the solution at 510 nm 5 min after complete dissolution of the tablet. Standard working curve with linearity range between 0. 2 to 4.0 mg .L-1 was prepared by using Fe（ Ⅲ ） standard solution. Detection limit （3σ） found was 0.07 mg .L -1, and value of RSD （n=6） found was 0.57% at the concentration of 1. 5 mg .L-1of Fe（ Ⅲ）. Three kinds of water samples were analyzed by this method, giving values of Fe-contents in consistency with those obtained by the GB standard method.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2013年第11期1294-1296,1304,共4页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
国家"十二.五"科技支撑计划(2012BAJ24B01)资助
关键词
试剂片检测法
水体
铁
邻菲啰啉
Testing with reagent tablet
Water
Iron
o Phenanthroline
作者简介
许夏伟（1989-），女，江苏金坛人，硕士研究生，研究方向环境污染现场检测。
联系人。Email：EMSL@tongji．edu．cn
