The sample preparation was performed in accordance with the
State standard of Russia e GOST R (GOST R 52470-2005, 2006) as
follows.To 50ml of a drink 1ml of glacial acidic acidwas added. The
mixture was heated in a water bath at 80e90 C for 5 min and then
cooled to the room temperature. The mixture was passed through
the solid phase extraction cartridge filled with 500 mg of Al2O3
(activated, acidic, Brockmann I, Sigma Aldrich Co. LLC, St. Louis, MO,
USA) pre-treated with 25 ml of glacial acidic acid. The desorption
was performed by eluting with 25 ml/100 ml aqueous ammonia
solution until the full discoloration of the adsorbent in a cartridge
was achieved. The eluate was collected and evaporated to dryness
in a water bath at 80e90 C, cooled and dissolved in water to give
the sample solution for further analysis.
The sample preparation was performed in accordance with theState standard of Russia e GOST R (GOST R 52470-2005, 2006) asfollows.To 50ml of a drink 1ml of glacial acidic acidwas added. Themixture was heated in a water bath at 80e90 C for 5 min and thencooled to the room temperature. The mixture was passed throughthe solid phase extraction cartridge filled with 500 mg of Al2O3(activated, acidic, Brockmann I, Sigma Aldrich Co. LLC, St. Louis, MO,USA) pre-treated with 25 ml of glacial acidic acid. The desorptionwas performed by eluting with 25 ml/100 ml aqueous ammoniasolution until the full discoloration of the adsorbent in a cartridgewas achieved. The eluate was collected and evaporated to drynessin a water bath at 80e90 C, cooled and dissolved in water to givethe sample solution for further analysis.
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