title: Transfer of thallium from rape seed to rape oil is negligible and oil is fit for human consumption.
abstract: Rape and other Brassicaceae family plants can accumulate appreciable amounts of thallium from the soil. Because some species of this family are common crops utilised as food for direct consumption or raw materials for food production, thallium can enter the food chain. A useful method for thallium determination is inductively coupled plasma mass spectrometry. The limit of detection (0.2 pg ml(-1) Tl or 0.02 ng g(-1) Tl, taking in the account dilution during sample decomposition) found in the current study was very low, and the method can be used for ultra-trace analysis. Possible transfer of thallium from rape seed to the rape oil was investigated in two ways. The balance of thallium in rape seed meal (content 140-200 ng g(-1) Tl) and defatted rape seed meal indicated that thallium did not pass into the oil (p < 0.05). Moreover, the analyses of thallium in six kinds of edible rape seed oil and three kinds of margarines showed that the amount of thallium in rape seed oil is negligible.
authors.affiliation: a Department of Analytical Chemistry , University of Chemistry and Technology Prague , Prague 6, Czech Republic.
authors.forename: Martin
authors.initials: M
authors.lastname: Loula
authors.affiliation: a Department of Analytical Chemistry , University of Chemistry and Technology Prague , Prague 6, Czech Republic.
authors.forename: Antonín
authors.initials: A
authors.lastname: Kaňa
authors.affiliation: a Department of Analytical Chemistry , University of Chemistry and Technology Prague , Prague 6, Czech Republic.
authors.forename: Magda
authors.initials: M
authors.lastname: Vosmanská
authors.affiliation: a Department of Analytical Chemistry , University of Chemistry and Technology Prague , Prague 6, Czech Republic.
authors.forename: Richard
authors.initials: R
authors.lastname: Koplík
authors.affiliation: a Department of Analytical Chemistry , University of Chemistry and Technology Prague , Prague 6, Czech Republic.
authors.forename: Oto
authors.initials: O
authors.lastname: Mestek
mesh_terms: D029741:Brassica rapa / Q000737:chemistry*; D006801:Humans; D057230:Limit of Detection; D013058:Mass Spectrometry / Q000379:methods; D012639:Seeds / Q000737:chemistry*; D013793:Thallium / Q000737:chemistry*
chemical_list: D013793:Thallium
keywords: Thallium; margarine; rape oil