Determination of trace-elements and toxic heavy minerals in Thai longan, litchi and Siam weed honeys using ICP-MS
2018
Wetwitayaklung, P. | Wangwattana, B. | Narakornwit, W.
Eupatorium odoratum (Siam weed), Litchi chinensis (litchi) and Dimocarpus longan (longan)honeys harvested in Thailand were analyzed for their trace elements (Ag, Al, Ba, Cd, Co, Cs,Cu, Fe, Ga, Li, Mg, Mn, Rb, Se, Sr, and U) and toxic heavy metals (As, Be, Cd, Cr, Ni, Pb, Tl and V) contents using inductively coupled plasma mass spectrometry (ICP-MS). The validation of analytical procedure showed satisfactory results. The maximum and minimum heavy metals in Siam weed, litchi and longan honeys were Mg, (18.71±7.66, 10.19±3.01 and 21.83±5.00 mg/kg) and Be (0.67±0.24, 0.07±0.20 and 0.45±0.18 µg/kg) respectively. The analysis of the 3 honeys revealed sequence of overall toxic metals in the following: Pb > Ni > Cr > Cd >Tl > V > As > Be for Siam weed, Pb > Cr > Cd > Ni > Tl > V > As > Be for Litchi, and Ni > Pb> Cr > Cd > Tl > V > As > Be for Longan honey. The contents of toxic heavy metals in the samples did not exceed the established maximum level in foodstuffs according to Commission Regulation (EC) No.1881/2006. However one litchi honey sample contained Pb (1.07 mg/kg) with the highly deviated content from median of its group and more than the permissible limit regulated by the Ministry of Public Health of Thailand (< 0.5 mg/kg). This may suggested an environmental contaminant of Pb to the sample.
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