Homogeneity and Stability Studies During the Preparation of a Laboratory Reference Material of Soy Leaves for the Determination of Metals

Ana Maria Pinto dos Santos · Daniel C. Lima · Robson Mota de Jesus · Sérgio L.C. Ferreira

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Scientific Measurement and Uncertainty Evaluation Analytical chemistry methods development Heavy Metals in Plants

Abstract

The homogeneity and stability of metals were tested in a candidate laboratory reference material of soy leaves. Inductively coupled plasma-optical emission spectrometry was used to quantify calcium, magnesium, manganese, iron, zinc, copper, and vanadium. A 6 kg amount of the material, which was dried, ground, and classified as mesh 60, was distributed among 100 bottles. The between-bottle homogeneity test was established by analyzing two subsamples from nine bottles. For the within-bottle test, five determinations of each element of a single bottle were performed. The stability test was performed at temperatures of -10, +27, and +40 degrees C, and after storage times of 4, 12, 24, and 52 weeks. The obtained results indicated that the material was homogeneous and stable under the conditions studied.

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References

2002Harmonized guidelines for single-laboratory validation of methods of analysis (IUPAC Technical Report)2001Homogeneity and stability of reference materials 2004Certified reference materials (CRMs) for quality control of trace-element determinations in wastewaters 2008Preparation and certification of creatinine and urea reference materials with certified purity as a traceability source in clinical chemical measurements 2003Preparation of a beef-extract as a laboratory reference material for the determination of heterocyclic amines 2009Preparation and characterisation of fried chicken as a laboratory reference material for the analysis of heterocyclic amines

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2016Preparation and characterization of a new reference material for the inorganic analysis of corn flour

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