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Liu C.,Fuzhou University | Luo F.,Fujian Research Institute of Metric Science | Chen D.,Fujian Research Institute of Metric Science | Qiu B.,Fuzhou University | And 3 more authors.

A simple and rapid fluorescence method has been developed for the determination of acrylamide in heat-processed food samples. In the determination, acrylamide is degraded through Hofmann reaction to generate vinyl amine, and pyrrolinone is produced when the vinyl amine reacts with fluorescamine, resulting in a strong fluorescence emission at 480 nm. Hofmann reaction is a key step for the fluorescence determination of acrylaminde, and the reaction conditions are investigated and optimized. Under the optimal conditions, the fluorescence intensity increases with the increase of acrylamide concentrations. The linear range between the fluorescence intensity and the square-root of acrylamide concentrations is from 0.05 μg mL-1 to 20 μg mL-1 with the correlation coefficient R2=0.9935. The detection limit is 0.015 μg mL-1 and the recovery for food samples is from 66.0% to 110.6%. In comparison with Specification of Entry&Exit Inspection and Quarantine Bureau of The Peoples Republic of China (SN/T 2281-2009), the method showed comparable results and demonstrated the accuracy of the method. © 2014 Elsevier B.V. All rights reserved. Source

Lin Q.,Key Laboratory of Global Change and Marine Atmospheric Chemistry | Lin Q.,Third Institute of Oceanography | Lin H.M.,Key Laboratory of Global Change and Marine Atmospheric Chemistry | Lin H.M.,Third Institute of Oceanography | And 6 more authors.
Science China Chemistry

In this work, we reported a simultaneous determination approach for Pb(II), Cd(II) and Zn(II) at μg L-1 concentration levels using differential pulse stripping voltammetry on a bismuth film electrode (BiFE). The BiFE could be prepared in situ when the sample solution contained a suitable amount of Bi(NO)3, and its analytical performance was evaluated for the simultaneous determination of Pb(II), Cd(II) and Zn(II) in solutions. The determination limits were found to be 0.19 μg L-1 for Zn(II), and 0.28 μg L-1 for Pb(II) and Cd(II), with a preconcentration time of 300 s. The BiFE approach was successfully applied to determine Pb(II), Cd(II) and Zn(II) in tea leaf and infusion samples, and the results were in agreement with those obtained using an atomic absorption spectrometry approach. Without Hg usage, the in situ preparation for BiFE supplied a green and acceptability sensitive method for the determination of the heavy metal ions. © Science China Press and Springer-Verlag Berlin Heidelberg 2013. Source

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