单柱离子色谱法同时测定磷酸中痕量钠（Ⅰ）和铁（Ⅲ）

Simultaneous Determination of Na￣+and Fe_e￣(3+) in Phosphoric Acid by Single Column Ion Chromatography

以酒石酸－乙二胺为淋洗液的单柱离子色谱法同时测定磷酸中痕量钠（Ⅰ）和铁（Ⅲ）。淋洗液最佳浓度为４．０ｍｍｏｌ．Ｌ￣（－１）、酒石酸／１．０ｍ ｍｏｌ·Ｌ￣（－１）乙二胺。最低检测限为Ｎａ￣＋０．０５μｇ／ｍＬ、 Ｆｅ３＋ ０．４５μｇ／ｍＬ。电导检测灵敏度为２．０μｇ／ｃｍ。线性范围Ｎａ￣＋、Ｆｅ３＋０．２～１．５×１０３μｇ／ｍＬ、２．５～１．０×１０３μｇ／ｍＬ。相对平均偏差Ｎａ￣＋为２．０３％、Ｆｅ３＋为０．８３％。平均回收率Ｎａ￣＋为９８．２６％、Ｆｅ３＋为９７．６２％。本法简便、快速、准确、选择性好。

Trace amount of Na￣+ and Fe￣3+ in phosphoric acid are simultaneously determined by single column ion chromatography using tartaric acid (4.0 mmol.L￣(-1)) and ethylenediamine (1.0mmol.L￣(-1)) mixture as eluant ,with a conductance detective sensitivity of 2. 0 μs/cm;a minimum detective limit of 0. 05 μg/mL for Na￣+ and 0. 45 μg/mL for Fe￣3+ ;a linear range of 0. 2￣1. 5 × 103 μg/mL for Na￣+ and 2. 5～1. 0× 103 μg/mL for Fe￣3+ ;a RSD of 2. 03 % for Na￣+ and 0.83% for Fe￣3+ ;Average recovery ratio of 98. 26 % for Na￣+and 97.62 % for Fe￣3+.