Authors:
F. Tagliaferro Universidade de São Paulo Centro de Energia Nuclear na Agricultura 13400-970 P.O. Box 96 Piracicaba, SP Brazil

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E. De Nadai Fernandes Universidade de São Paulo Centro de Energia Nuclear na Agricultura 13400-970 P.O. Box 96 Piracicaba, SP Brazil

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M. Bacchi Universidade de São Paulo Centro de Energia Nuclear na Agricultura 13400-970 P.O. Box 96 Piracicaba, SP Brazil

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P. Bode Delft University of Technology Interfaculty Reactor Institute Mekelweg 15 2629JB Delft The Netherlands

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E. Joacir De França Universidade de São Paulo Centro de Energia Nuclear na Agricultura 13400-970 P.O. Box 96 Piracicaba, SP Brazil

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Abstract  

Depending on the harvest conditions, coffee beans can be contaminated by soil when dropped to the ground. It is well known that agricultural soils act as sinks for agrochemicals applied to the crops. While coffee is brewed, substances present in the roasted and ground coffee beans are extracted by hot water, emphasizing the need to assess the possible transfer of impurities from the soil to the beverage. Soil-contaminated samples of roasted coffee beans were split into 2 groups according to the treatments: (a) washed and ground and (b) only ground. Brewing was performed in a household espresso machine for both coffees. The resulting beverage was freeze-dried and the elemental composition determined by instrumental neutron activation analysis (INAA). The mass fractions of the terrigenous elements Fe, La, Sc, Sm and Th in the freeze-dried non-washed coffee beverages were, at least, 2 times higher than in the washed samples. These elements are tracers of the soil, indicating that the impurities from the soil reached the beverage.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)