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http://dx.doi.org/10.5338/KJEA.2011.30.2.169

A Study on the Factors Causing Analytical Errors through the Estimation of Uncertainty for Cadmium and Lead Analysis in Tomato Paste  

Kim, Ji-Young (Department of Agro-Food Safety, National Academy of Agricultural Science, Rural Development Administration)
Kim, Young-Jun (WCU Biomodulation, Department of Agricultural Biotechnology, Seoul National University)
Yoo, Ji-Hyock (Department of Agro-Food Safety, National Academy of Agricultural Science, Rural Development Administration)
Lee, Ji-Ho (Department of Agro-Food Safety, National Academy of Agricultural Science, Rural Development Administration)
Kim, Min-Ji (Department of Agro-Food Safety, National Academy of Agricultural Science, Rural Development Administration)
Kang, Dae-Won (Department of Agro-Food Safety, National Academy of Agricultural Science, Rural Development Administration)
Im, Geon-Jae (Department of Agro-Food Safety, National Academy of Agricultural Science, Rural Development Administration)
Hong, Moo-Ki (Department of Agro-Food Safety, National Academy of Agricultural Science, Rural Development Administration)
Shin, Young-Jae (Department of Environmental Horticulture, Dankook University)
Kim, Won-Il (Department of Agro-Food Safety, National Academy of Agricultural Science, Rural Development Administration)
Publication Information
Korean Journal of Environmental Agriculture / v.30, no.2, 2011 , pp. 169-178 More about this Journal
Abstract
BACKGROUND: This study aimed to estimate the measurement uncertainty associated with determination of cadmium and lead from tomato paste by ICP/MS. The sources of measurement uncertainty (i.e. sample weight, final volume, standard weight, purity, molecular weight, working standard solution, calibration curve, recovery and repeatability) in associated with the analysis of cadmium and lead were evaluated. METHODS AND RESULTS: The guide to the expression of uncertainty was used for the GUM (Guide to the expression of Uncertainty in Measurement) and Draft EURACHEM/CITAC (EURACHEM: A network of organization for analytical chemistry in Europe/Co-Operation on International Traceability in Analytical Chemistry) Guide with mathematical calculation and statistical analysis. The uncertainty components were evaluated by either Type A or Type B methods and the combined standard uncertainty were calculated by statistical analysis using several factors. Expected uncertainty of cadmium and lead was $0.106{\pm}0.015$ mg/kg (k=2.09) and $0.302{\pm}0.029$ mg/kg (k=2.16), on basis of 95% confidence of Certified Reference Material (CRM) which was within certification range of $0.112{\pm}0.007$ mg/kg for cadmium (k=2.03) and $0.316{\pm}0.021$ mg/kg for lead (k=2.01), respectively. CONCLUSION(s): The most influential components in the uncertainty of heavy metals analysis were confirmed as recovery, standard calibration curve and standard solution were identified as the most influential components causing uncertainty of heavy metal analysis. Therefore, more careful consideration is required in these steps to reduce uncertainty of heavy metals analysis in tomato paste.
Keywords
Cadmium; Lead; Measurement; Uncertainty; Tomato paste;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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