CONTENT OF FIVE TRACE ELEMENTS IN DIFFERENT HONEY TYPES FROM KOPRIVNICA-KRIZEVCI COUNTY

摘要

Multifloral and unifloral honeys [black locust (Robinia pseudoacacia L.), chestnut (Castanea sativa Mill.), lime (Tilia spp.), indigobush (Amorfa fruticoza L.) and rapeseed (Brassica napus)] were collected from Koprivnica-Krizevci County in northwestern Croatia during 2010 and 2011. The concentrations of Cd, Pb, Hg, As and Cu were determined and mean levels of elements (mu g/kg) in honey samples measured were: in multifloral 1.26 for Cd, 163 for Pb, 135 for As, 1.35 for Hg and 11.7 for Cu; in black locust 1.52 for Cd, 182 for Pb, 23.2 for As, 0.46 for Hg and 7,697 for Cu; in lime 2.92 for Cd, 340 for Pb, 116 for As, 0.74 for Hg and 7,798 for Cu. Significant differences in Hg and Cu levels were observed between honey types. Average Cu levels found in lime and black locust honey types were much higher than those reported in other European countries. The highest element contents measured in different honey types were: Cd 4.0 mu g/kg and As 502 mu g/kg in rapeseed, Hg 6.11 mu g/kg in chestnut, Pb 2,159 mu g/kg in black locust and Cu 79,167 mu g/kg in indigobush. Lead concentrations measured in all honey types were much higher than levels obtained in Italy, Slovenia, Poland, Romania and Turkey. These indicate that special attention should be paid to ensuring positions of hive in zones of bee forage that are more distant from highways and railways. The results presented indicate a differentiation of the trace element content of honeys of different botanical origin obtained from the same area.