![Expert multi-syringe flow-injection system for the determination and speciation analysis of iron using chelating disks in water samples [An article from: Analytica Chimica Acta]](https://www.ebooknetworking.net/books/B00/0RR/bigB000RR010U.jpg)
Expert multi-syringe flow-injection system for the determination and speciation analysis of iron using chelating disks in water samples [An article from: Analytica Chimica Acta]
Book Details
Author(s)C. Pons, R. Forteza, V. Cerda
PublisherElsevier
ISBN / ASINB000RR010U
ISBN-13978B000RR0101
MarketplaceUnited Kingdom 🇬🇧
Description
This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
A novel expert multi-syringe flow-injection system has been developed. This system, which is able to choose for itself the best strategy to quantify the analyte, has been applied to the spectrophotometric determination, pre-concentration and speciation analysis of iron. The determination of the lowest iron concentrations benefits from the retention of the analyte on a chelating disk (iminodiacetic acid groups) which has been placed in a laboratory-made methyl methacrylate cylindrical device. A three-way solenoid commutation valve allows the deviation of the flow towards the chelating disk to follow the pre-concentration schemes when necessary. Ammonium thiocyanate was used as the chromogenic reagent for iron(III). Total iron can be determined by on-line oxidation of iron(II) to iron(III) with a hydrogen peroxide stream. A mass calibration was feasible in the wide range from 0.019 to 3@mg. The detection limit (3s"b/S) was 19ng. The repeatability (RSD), calculated from 11 replicates using 3ml injections of a 0.5mgl^-^1, was 2%. When pre-concentration was not required, two linear calibration graph between 0.1 and 20mgl^-^1 and between 0.2 and 35mgl^-^1 for the determination of iron(III) and total iron, respectively, were obtained. The proposed technique has been validated by replicate analysis (n=3) of a certified reference material of water with satisfactory results. The use of chelating disks offers several advantages over the conventional resin.
Description:
A novel expert multi-syringe flow-injection system has been developed. This system, which is able to choose for itself the best strategy to quantify the analyte, has been applied to the spectrophotometric determination, pre-concentration and speciation analysis of iron. The determination of the lowest iron concentrations benefits from the retention of the analyte on a chelating disk (iminodiacetic acid groups) which has been placed in a laboratory-made methyl methacrylate cylindrical device. A three-way solenoid commutation valve allows the deviation of the flow towards the chelating disk to follow the pre-concentration schemes when necessary. Ammonium thiocyanate was used as the chromogenic reagent for iron(III). Total iron can be determined by on-line oxidation of iron(II) to iron(III) with a hydrogen peroxide stream. A mass calibration was feasible in the wide range from 0.019 to 3@mg. The detection limit (3s"b/S) was 19ng. The repeatability (RSD), calculated from 11 replicates using 3ml injections of a 0.5mgl^-^1, was 2%. When pre-concentration was not required, two linear calibration graph between 0.1 and 20mgl^-^1 and between 0.2 and 35mgl^-^1 for the determination of iron(III) and total iron, respectively, were obtained. The proposed technique has been validated by replicate analysis (n=3) of a certified reference material of water with satisfactory results. The use of chelating disks offers several advantages over the conventional resin.
