在线液-液萃取微型万用分相器的设计和应用 Ⅱ.流动注射溶剂萃取分光光度法测定微量碘的分析性能

Design and Application of a Micro_versatile Phase Separator for Continuous Liquid_liquid Extraction II. Analytical Performance of Flow Injection Solvent Extraction Spectrophotometry for the Determination of Iodide

设计了一种实用的玻璃重力分相器及相应的萃取流路系统，用于在线萃取分光光度测定微量碘，萃取时ｖ水∶ｖ有机＝３０∶１，线性范围在０～３０００ｍｇ／ＬＩ－效果良好。检出限为７０μｇ／ＬＩ－，测定１ｍｇ／ＬＩ－的精密度（ＲＳＤ，ｎ＝７）为２２％，测定频率为２５／ｈ。方法用于市售海带中Ｉ－的测定，加标回收率为９８％。

A glass gravity phase separator for continuous liquid_liquid extraction system has been developed and used for the determination of trace iodide ion by on_line extraction_spectrophotometry. Experimental results showed that the separator provides several advantages over the existing ones reported in the literatures. The flow ratio of aqueous mobile phase to organic mobile phase ( v aq ∶ v org )is 30. The linear range for I - is 0～3 000 mg/L with detection limit of 70 μg/L. The precision of 2.2% RSD (1 mg/L of I -, n =7) and a sample throughput of 25/h were obtained. The method has been applied to the determination of I - in kelp with standard addition recovery of 98%.