<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>In this paper we propose uncertainty estimation for the analytical results we obtained from determination of Ni, Pb and Al by solidphase extraction and inductively coupled plasma optical emission spectrometry (SPE-ICP-OES). The procedure is based on the retention of analytes in the form of 8-hydroxyquinoline (8-HQ) complexes on a mini column of XAD-4 resin and subsequent elution with nitric acid. The influence of various analytical parameters including the amount of solid phase, pH, elution factors (concentration and volume of eluting solution), volume of sample solution, and amount of ligand on the extraction efficiency of analytes was investigated. To estimate the uncertainty of analytical result obtained, we propose assessing trueness by employing spiked sample. Two types of bias are calculated in the assessment of trueness: a proportional bias and a constant bias. We applied Nested design for calculating proportional bias and Youden method to calculate the constant bias. The results we obtained for proportional bias are calculated from spiked samples. In this case, the concentration found is plotted against the concentration added and the slop of standard addition curve is an estimate of the method recovery. Estimated method of average recovery in Karaj river water is: (1.004±0.0085) for Ni, (0.999±0.010) for Pb and (0.987±0.008) for Al.</p></abstract>

In this paper we propose uncertainty estimation for the analytical results we obtained from determination of Ni, Pb and Al by solidphase extraction and inductively coupled plasma optical emission spectrometry (SPE-ICP-OES). The procedure is based on the retention of analytes in the form of 8-hydroxyquinoline (8-HQ) complexes on a mini column of XAD-4 resin and subsequent elution with nitric acid. The influence of various analytical parameters including the amount of solid phase, pH, elution factors (concentration and volume of eluting solution), volume of sample solution, and amount of ligand on the extraction efficiency of analytes was investigated. To estimate the uncertainty of analytical result obtained, we propose assessing trueness by employing spiked sample. Two types of bias are calculated in the assessment of trueness: a proportional bias and a constant bias. We applied Nested design for calculating proportional bias and Youden method to calculate the constant bias. The results we obtained for proportional bias are calculated from spiked samples. In this case, the concentration found is plotted against the concentration added and the slop of standard addition curve is an estimate of the method recovery. Estimated method of average recovery in Karaj river water is: (1.004±0.0085) for Ni, (0.999±0.010) for Pb and (0.987±0.008) for Al.

Uncertainty Estimation for the Determination of Ni, Pb and Al in Natural Water Samples by SPE-ICP-OES

Department of chemistry, Islamic Azad University, Saveh Branch, Saveh, Iran

Department of biostatistics, Tehran Medical Sciences, Tehran, Iran

Department of chemistry, Islamic Azad University, North Tehran Branch, Tehran, Iran

Department of chemistry, Science and Research Campus, Islamic Azad University, Tehran, Iran

Measurement Science Review

In this paper we propose uncertainty estimation for the analytical results we obtained from determination of Ni, Pb and Al by solidphase extraction and...

Uncertainty Estimation for the Determination of Ni, Pb and Al in Natural Water Samples by SPE-ICP-OES

Published Online: Dec 29, 2008

Page range: 151 - 157

DOI: https://doi.org/10.2478/v10048-008-0034-7

Keywords
Solid phase extraction, Amberlite XAD-4, inductively coupled plasma-optical emission spectroscopy (ICP-OES), Uncertainty

This content is open access.

Uncertainty Estimation for the Determination of Ni, Pb and Al in Natural Water Samples by SPE-ICP-OES

Published Online: Dec 29, 2008

Page range: 151 - 157

DOI: https://doi.org/10.2478/v10048-008-0034-7

KeywordsSolid phase extraction, Amberlite XAD-4, inductively coupled plasma-optical emission spectroscopy (ICP-OES), Uncertainty

This content is open access.

Keywords
Solid phase extraction, Amberlite XAD-4, inductively coupled plasma-optical emission spectroscopy (ICP-OES), Uncertainty