"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Interlaboratory study on Cu, Pb and Zn determination in soil by inductively coupled plasma optical emission spectrometry using the Bland and Altman test

T. FRENTIU1, M. PONTA1, E. LEVEI2, M. SENILA2, M. URSU2, E. CORDOS2

Affiliation

  1. Babes-Bolyai University, Department of Chemistry, Arany Janos 11, 400028 Cluj-Napoca, Romania
  2. INCDO-INOE 2000, Research Institute for Analytical Instrumentation, Donath 67, 400293 Cluj-Napoca, Romania

Abstract

The application of the Bland-Altman plot for an interlaboratory study on Cu, Pb and Zn determination over a large concentration range by Inductively Coupled Plasma Optical Emission Spectrometry is described. The method-performance study was selected to estimate the figures of merit within and between two laboratories following the same digestion procedure and analysis technique for 89 soil samples. The regression analysis, the confidence interval of differences mean between results and its 1.96 s limits of agreement revealed a good between-laboratory agreement for a 95 % confidence level. The confidence interval of bias (mg kg-1) was -6±10 Cu, 11±11 Pb and -8 ±10 Zn. The within-laboratory standard deviations (mg kg-1) were similar (29-32; 29-33), while the between-laboratory standard deviations were 47; 51 and 46 mg kg-1 for Cu, Pb and Zn up to 1000 mg kg-1. The within-laboratory accuracy and precision were assessed using 4 certified reference materials..

Keywords

Interlaboratory study, Bland and Altman test, Regression analysis, Soil analysis, Optical spectrometry.

Submitted at: Aug. 1, 2007
Accepted at: Nov. 16, 2007

Citation

T. FRENTIU, M. PONTA, E. LEVEI, M. SENILA, M. URSU, E. CORDOS, Interlaboratory study on Cu, Pb and Zn determination in soil by inductively coupled plasma optical emission spectrometry using the Bland and Altman test, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 11, pp. 3505-3513 (2007)