Flow Injection with an Integrated Retention/Photometric Detection Unit for the Determination of Iron in Water

✍ Scribed by Pablo Richter; M.Inés Toral

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 78 KB
• Volume: 53
• Category: Article
• ISSN: 0026-265X
• DOI: 10.1006/mchj.1996.0058

✦ Synopsis

An integrated retention/photometric detection method for the determination of microamounts of iron was developed. The method is based on the retention of the reaction product of the analyte with ferrozine in a flow cell packed with an anion exchange support, and on the subsequent elution of the retained complex with a solution of 1.5% sodium peroxide, which allows the reuse of the system. The method is highly selective and has a detection limit (3) of 4.3 ng ml -1 . Iron was thus determined in the range 10-200 ng ml -1 with a relative standard deviation of 1-3% (n ‫ס‬ 11). The method was applied to the determination of iron in tap and river water and the results were consistent (2%) with those provided by AAS.