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Soil sampling within the project “Food Safety and Quality Center”

As part of the scientific research project "Food Safety and Quality Center", sampling of food, water and soil samples in the Republic of Croatia is planned for the needs of making an isotope map and information database of Croatian indigenous and organic food products. The paper presents the comprehensiveness of soil sampling. Soil sampling was conducted in four selected regions: eastern Croatia, central Croatia, northern littoral and southern littoral. Each geographical area has a specific and unique soil composition and a unique ratio of oxygen and hydrogen isotopes as elements of which water is composed, as well as carbon as a representative of the organic component. Soil sampling was carried out during 2019 and 2020 by the accredited method according to the standard HRN ISO 18400-102: 2017. At each location, one representative composite soil sample up to a depth of 30-50 cm was sampled, consisting of five subsamples. Approximately one kilogram of soil was taken with a polished probe made of stainless steel. The coordinates of the sampling locations were determined by GPS. A total of 120 soil samples were sampled. Immediately after sampling, the dry matter, electrical conductivity and pH value were determined in the samples and the rest of the sample was stored for other analyzes such as heavy metal determination, pesticide determination and isotope analysis). From the obtained pH values, it was determined that the soils in the north and south littoral are mostly alkaline, in eastern Croatia slightly acidic to neutral, while in central Croatia they ranged from acidic to alkaline.

composite soil sample ; dry matter ; electrical conductivity ; isotope map ; pH value

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