Heavy metals in potatoes
1997
Kaerblane, H. | Kevvai, L. | Kanger, J. (Estonian Agricultural Univ., Tartu (Estonia))
There are always heavy metals in smaller or larger quantities in potatoes. The test results revealed that there is always a smaller degree of dangerous heavy metals (Pb, Cd, Hg) in potatoes than the maximum allowed grade in Estonia for table potatoes. The permitted grade for Pb is 3.0, for Cd 0.2 and for Hg 0.1 mg/kg in dry matter. Of the samples collected from 69 different Estonian regions only one contained more Cd than permitted, being 0.22 mg/kg in dry matter. The content of heavy metals in different organs of the potato plant (roots, stalks, tubers) varies. There are always more heavy metals in potato peel than in the inside of the tuber. The content of heavy metals in potatoes varies considerably, being affected by the content of the corresponding heavy metal in the soil of the growing area, by the soil reaction, humus content, soil characteristics and fertilising. The variety of potato plays no role in content of heavy metals
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