Issue 6, 2019

Multi-flow calibration applied to microwave-induced plasma optical emission spectrometry

Abstract

Multi-flow calibration (MFC) is based on a single calibration standard and multiple nebulization gas flow rates (Q). Analytical signals are recorded at different Q conditions, and intensities from calibration standards and samples are plotted on the x and y axes, respectively. The analyte concentration in the sample is calculated by multiplying the standard concentration by the calibration plot slope. In the present work, MFC is used to determine Cr, Cu, Fe and Mn in water and food samples by microwave-induced plasma optical emission spectrometry. Analyte percent recoveries for certified reference materials and addition/recovery experiments were in the 91–112% and 84–134% ranges for MFC and external standard calibration (EC), respectively. The limits of detection (LODs) for Cr, Cu, Fe and Mn were 20, 5, 7 and 2 μg L−1 using MFC (0.6, 8, 20 and 1 μg L−1 for EC). Precisions were in the 0.9–12.2% and 1.9–23.9% ranges for MFC and EC, respectively. MFC may minimize matrix effects as it exposes all solutions to a variety of plasma conditions. This normalizing effect may be capable of improving accuracies compared with EC for simple to moderately complex matrix samples. One of MFC's main limitations is the potential for systematic errors associated with solution preparation (a single calibration standard is used). Variation in Q may also result in higher LODs and lower sample throughputs compared with EC. On the other hand, neither negative effects due to a poor choice of Q nor additional experiments to optimize it are required with MFC.

Graphical abstract: Multi-flow calibration applied to microwave-induced plasma optical emission spectrometry

Article information

Article type
Paper
Submitted
14 мар 2019
Accepted
05 апр 2019
First published
05 апр 2019

J. Anal. At. Spectrom., 2019,34, 1191-1197

Multi-flow calibration applied to microwave-induced plasma optical emission spectrometry

C. B. Williams, B. T. Jones and George L. Donati, J. Anal. At. Spectrom., 2019, 34, 1191 DOI: 10.1039/C9JA00091G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements