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Iammarino M.,National Reference Center for the Detection of Radioactivity in Feed and Foodstuff | Dell'Oro D.,National Reference Center for the Detection of Radioactivity in Feed and Foodstuff | Bortone N.,National Reference Center for the Detection of Radioactivity in Feed and Foodstuff | Mangiacotti M.,National Reference Center for the Detection of Radioactivity in Feed and Foodstuff | Chiaravalle A.E.,National Reference Center for the Detection of Radioactivity in Feed and Foodstuff
Food Analytical Methods | Year: 2015

Radiostrontium is a radiotoxic isotope, chemically an analogue to calcium. For this reason, it may follow similar pathways to this essential nutrient, and it is considered an important contaminant of several food supply chains. Different analytical methods are currently available for the determination of radiostrontium; however, they were optimised especially for the determinations in liquid (milk, water, etc.) and environmental matrices. Moreover, the validation procedures, necessary to assure methods reliability, are still lacking. In this work, a radiochemical analytical method for the determination of radiostrontium in several solid foodstuffs (meat, seafood, dairy products, wheat and derived products) was optimised and validated, following an in-house validation model, according to reference legislation. Good analytical performances were obtained. Method specificity and linearity were ascertained together with measurement uncertainty (equal to 16.0 %). The minimal detectable activity was equal to 8.0 mBq kg−1, while the mean repeatability (CV%) and recovery values were equal to 14.5 and 90.5 %, respectively. A test on a reference material was also effected, confirming method reliability for 90Sr quantifications in solid foodstuffs. © 2015 Springer Science+Business Media New York Source


dell'Oro D.,National Reference Center for the Detection of Radioactivity in Feed and Foodstuff | Iammarino M.,National Reference Center for the Detection of Radioactivity in Feed and Foodstuff | Bortone N.,National Reference Center for the Detection of Radioactivity in Feed and Foodstuff | Mangiacotti M.,National Reference Center for the Detection of Radioactivity in Feed and Foodstuff | Chiaravalle A.E.,National Reference Center for the Detection of Radioactivity in Feed and Foodstuff
Food Additives and Contaminants - Part A Chemistry, Analysis, Control, Exposure and Risk Assessment | Year: 2014

Strontium-90 is a hazardous radionuclide derived from nuclear fission processes, and it decays emitting high-energy beta-particles forming yttrium-90. It may be easily absorbed in humans through several food supply chains, since it is chemically similar to some important biological elements such as potassium and calcium. In this work an analytical method for the determination of radiostrontium in milk by liquid scintillation counting was developed in order to obtain a precise quantification at low activity concentration levels. Moreover, a full validative approach was applied to confirm method reliability. Good analytical performance was obtained by developing an in-house validation model according to Regulation 882/2004/EC and Decision 657/2002/EC with a good selectivity, a decision threshold and detection limit corresponding to 0.003 and 0.006 Bq l–1 (α = β = 0.05) respectively, a repeatability value, expressed as CV%, equal to 13%, a mean recovery value equal to 102.5% and a measurement uncertainty equal to 11.5%. Strontium and yttrium chemical yields were determined by a reliable analytical method by inductively coupled mass spectrometry, assuring a suitable correction of final result. The results of the method validation, combined with a quality control assurance, performed on a reference material, demonstrated that the procedure represents a substantial improvement in the determination of 90Sr relating to accurate confirmation analyses. © 2014, © 2014 Taylor & Francis. Source


Iammarino M.,National Reference Center for the Detection of Radioactivity in Feed and Foodstuff | Dell'Oro D.,National Reference Center for the Detection of Radioactivity in Feed and Foodstuff | Bortone N.,National Reference Center for the Detection of Radioactivity in Feed and Foodstuff | Mangiacotti M.,National Reference Center for the Detection of Radioactivity in Feed and Foodstuff | And 2 more authors.
Food Chemistry | Year: 2016

90Sr is considered an important contaminant relating to food supply chains. In this study, 176 liquid and 260 solid foods, were analysed in order to quantify 90Sr. Through ruggedness tests, the application field of radiochemical methods used was extended successfully to all most important types of foodstuffs. Regarding liquid matrices, milk samples resulted the most important indicator about 90Sr contamination, with mean 90Sr activity concentration equal to 0.058 Bq L-1. Among other liquid foods, wine/spirits and livestock watering resulted the most contaminated, with mean contamination levels equal to 0.022 and 0.035 Bq L-1, respectively. Concerning solid matrices, cheeses produced from sheep's milk and animal feeds resulted the most contaminated (mean levels: 1.237 and 1.557 Bq kg-1, respectively). Meat products and seafood showed contamination levels not significant within this survey; while, among vegetables, cacao/chocolate and spices resulted in contamination levels comparable with those of cheese obtained from milk of cows origin. © 2016 Elsevier Ltd. All rights reserved. Source

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