5 years ago



A “tailored” method

A “tailored” method The method was validated in accordance with the guidelines set out in the SANCO/10684/2009 document. As a result of this: • there is no matrix effect, the calibration curve is therefore prepared by derivatising the compounds outside of the matrix and covers a range of concentrations from 20 µg/kg to 500 µg/kg; • the derivatisation conditions are well adapted since they achieve yields at the limit of quantification (20 µg/kg) of 101.1 % (RSD of 6.9 %) and 112.9 % (RSD of 11.9 %) for glyphosate and AMPA respectively. The determination of glyphosate at trace level is unquestionably complicated. However, if the correct analytical method is chosen, rather effective results can be achieved. In our case, the choice of isotope dilution quantification has allowed us to achieve a good yield without having to worry about potential losses during the rapid stage (1 min) of simultaneous extraction-purification. Derivatisation has been a success since it allows us to easily incorporate the analysis of glyphosate into routine analyses without making any changes instrumentally, which therefore represents a considerable time saving benefit. 16

Migration risks in traditional metal teapots In Brussels, the use of a traditional teapot has led to cases of lead poisoning involving an entire family. Various teapot samplings were carried out by the ISP (Scientific Institute of Public Health) in partnership with the Brussels Intermunicipal Laboratory for Chemistry and Bacteriology and the FASFC (Federal Agency for the Safety of the Food Chain), which proceeded with the withdrawal of these pots from the market. The concentration of toxic metals (Lead and Nickel) migrating into the tea is a cause of particular concern and can pose a serious poisoning risk. When looking at the measured values, it is clear that the use of these teapots can lead to cases of acute lead poisoning. Indeed, the exceedance of the lead and nickel toxicological reference values is very disturbing. Although the assumptions made are not intended to be exhaustive, they demonstrate the possibility of exceeding the lead Acceptable Daily Intake (ADI) by up to 90 times. However, factors such as a longer seeping time (migration up to 9 times higher after 1 hour in comparison with 15 min) may aggravate the problem further. The use of lemon can be an equally aggravating factor since the level of migration can be up to 10 times higher than with a plain tea. The sustained intake by vulnerable groups such as children (as in the case referred to above) is also worth noting since the latter are even more sensitive than adults to lead poisoning (5 times higher assimilation). 17

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