Abstract
Reference material plays an important role in analytical measurements. Total arsenic was analyzed in tuna fish samples using three different preparation methods for stability. The stability of total arsenic in tuna fish was evaluated over 12 months, under room temperature storage condition. Each measurement was conducted in triplicate in three different laboratories. Statistical analysis was carried out using Student’s t-test. Two different methods were conducted to confirm homogeneity of the candidate reference material in this study. Random bottle number was applied in this analysis. Statistical analysis was carried out and the homogeneity for total arsenic was calculated using the one-way analysis of variance (ANOVA). The statistical results showed no significant changes in stability and the sample was homogeneous. The candidate reference material developed in this study demonstrated its suitability for quality assurance of the total arsenic measurement in tuna fish.
Highlights
Arsenic is a metalloid widely distributed in the earth’s crust and present at an average concentration of 2 μg/g
The candidate reference material developed in this study demonstrated its suitability for quality assurance of the total arsenic measurement in tuna fish
No significant difference was observed among aliquots of the candidate reference material (RM)
Summary
Arsenic is a metalloid widely distributed in the earth’s crust and present at an average concentration of 2 μg/g. The use of CRM on testing and calibration process is a requirement from ISO/IEC 17025-2005 This material is an essential tool to the quality control of measurement methods [3]. The ISO Guide 35 states that the certification process of a CRM requires a careful study of all sources of uncertainty that can cause impact on the validity of the certified values. The objective of this study was to provide an RM which can be used as in-house reference material for quality control for the determination of total arsenic in tuna fish samples for Indonesian testing laboratories
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