Abstract
An acid-assisted microwave digestion procedure was optimised for the determination of trace elements in foodstuffs by the use of flame and electrothermal atomic absorption spectrometric (FAAS, ETAAS) techniques. Zn, Cu, Cd, Pb, Ni and Cr were determined in cabbage, wheat, potato, instant milk, fish, eggs and baby foodstuffs. The repeatability of measurements was tested in the cabbage sample and was found to be ±3.3% for Zn, 4.6% for Cd, ±6.8% for Cu and ±15.5% for Cr. The worse value obtained for Cr was probably due to its inhomogeneous distribution and very low concentration in the cabbage. Concentrations of Ni and Pb in the cabbage sample were below the limit of detection (0.2 mg kg−1). The accuracy of the analytical procedure was checked by the analysis of the standard reference material CRM 1570 Trace and minor elements in spinach leaves and IAEA 336 Trace and minor elements in lichen. Good agreement between the certified or indicative and determined values was obtained. The results indicate that the concentrations of Zn, Cu, Cd, Pb, Ni and Cr found in cabbage, wheat and potato are comparable to the literature data. Cd, Pb and Ni were not found to be the contaminants in the foodstuffs analysed. Higher concentrations of Ni were found only in baby food "Čokolešnik", arising from the cocoa that "Čokolešnik" contained. It was demonstrated that the Cr content is very low in baby food, yolk and white of egg and in fish (<0.05 mg kg−1 Cr). Elevated concentrations of trace elements were found only in mussels that accumulate heavy metals from the marine environment.
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Milačič R, Leskovšek H, Dolinšek F, Hrček D (1995) A complex study of air pollution with cadmium, lead and polycyclic aromatic hydrocarbons, sulfur dioxide, and black smoke in the Zasvaje industrialized urban region in Slovenia. Ann Chim 85:131–148
Pustišek N, Milačič R, Veber M (2001) Use of the BCR three-step sequential extraction procedure for the study of the partitioning of Cd, Pb and Zn in various soil samples. J Soil Sediments 1(1):25–29
Svete P, Milačič R, Pihlar B (2001) Partitioning of Zn, Pb and Cd in river sediments from lead and zinc mining area using the BCR three-step sequential extraction procedure. J Environ Monit 3:586–590
Schuhmacher M, Domingo JL, Llobet JM, Corbella, J (1995) Variations of heavy metals in water, sediments, and biota from the delta of Erbo river, Spain. J Environ Sci Health A30(6):1361–1372
Fichet D, Boucher G, Radenac G, Miramand P (1999) Concentration and mobilisation of Cd, Cu, Pb, and Zn by meiofauna populations living in harbour sediment: their role in the heavy metal flux from sediment to food web. Sci Total Environ 243/244:267–272
Jewett SC, Naidu AS (2000) Assessment of heavy metal pollution in red king crabs following offshore placer gold mining. Mar Poll Bull 40:478–490
Alberti-Fidanza A, Burini G, Perriello G (2002). Trace elements in foods and meals consumed by students attending the faculty cafeteria. Sci Total Environ 287:133–140
Minoia C, Sabbioni E, Ronchi A, Gatti A, Pietra R, Nicolotti A, Fortaner S, Balducci C, Fonte A, Roggi C (1994) Trace element reference values in tissues from inhabitants of the European Community. IV. Influence of dietary factors. Sci Total Environ 141:181–195
Coni E, Caroli S, Ianni D, Bocca. A (1994) A methodological approach to the assessment of trace elements in milk and dairy products. Food Chem 50:203–201
Cabrera C, Lorenzo ML, De Mena C, Lopez MC (1996) Chromium, copper, iron, manganese, selenium and zinc levels in dairy products: in vitro study of absorbable fractions. Int J Food Sci Nutr 47:331–339
Rupérez, P. (2002) Mineral content of edible marine seaweeds. Food Chem 79:23–26
Kuhnlein HV, Chan HM, Leggee D, Barthet V (2002) Macronutrient, mineral and fatty acid composition of Canadian Arctic traditional food. J Food Compos Anal 15:545–566
Ajlec R, Čop M, Štupar J (1988) Interferences in the determination of chromium in plant materials and soil samples by flame atomic absorption spectrometry. Analyst 113:585–590
Lendinez E, Lorenzo ML, Cabrera C, López MC (2001) Chromium in basic foods of the Spanish diet: seafood, cereals, vegetables, olive oils and dairy products. Sci Total Environ 278:183–189
Schuhmacher M, Domingo JL, Llobet JM, Corbella J (1993) Chromium, copper, and zinc concentrations in edible vegetables grown in Tarragona province, Spain. Bull Environ Contam Toxicol 50:514–521
Pokorn D, Stibilj V, Gregorič B, Dermelj M, Štupar J (1998). Elemental composition (Ca, Mg, Mn, Cu, Cr, Zn, Se, and I) of daily diet samples from some old people's homes in Slovenia. J Food Compos Anal 11:47–53
D'Ilio S, Alessandrelli M, Cresti R, Forte G, Caroli S (2002) Arsenic content of various types of rice as determined by plasma-based techniques. Microchem J 73:195–201
Iyengar GV, Wolf WR, Tanner JT, Morris ER (2000) Content of minor and trace elements, and organic nutrients in representative mixed total diet composites from the USA. Sci Total Environ 256:215–226
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This work was financed by the Ministry of Education, Science and Sport of the Republic of Slovenia and the Ministry of Agriculture.
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Milačič, R., Kralj, B. Determination of Zn, Cu, Cd, Pb, Ni and Cr in some Slovenian foodstuffs. Eur Food Res Technol 217, 211–214 (2003). https://doi.org/10.1007/s00217-003-0755-7
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DOI: https://doi.org/10.1007/s00217-003-0755-7