Heat-assisted slurry sampling GFAAS method for determination of lead in food standard reference materials |
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| Affiliation: | 1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, PR China;2. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, PR China;3. Beijing CKC, PerkinElmer, Inc., 100015, PR China;1. University of Ioannina, Dept. of Materials Science and Engineering, Ioannina GR-45110, Greece;2. Laboratoire MATEIS, INSA Lyon, 7 Avenue Jean Capelle, 69621 Villeurbanne Cedex, France;1. School of Chemistry and Chemical Engineering, State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, 210023, China;2. MaAnShan High-Tech Research Institute of Nanjing University, MaAnShan, 238200, China;3. Department of Organic Chemistry I, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel Lardizábal 3, 20018 San Sebastián, Spain;4. IKERBASQUE, Basque Foundation for Science, Alameda Urquijo 36-5, Plaza Bizkaia, 48011 Bilbao, Spain;1. National Marine Science Centre, School of Environment, Science and Engineering, Southern Cross University, PO Box 4321, Coffs Harbour, NSW 2450, Australia;2. Marine Ecology Research Centre, School of Environment, Science and Engineering, Southern Cross University, Lismore, NSW 2480, Australia;3. NSW Department of Primary Industries, National Marine Science Centre, PO Box 4321, Coffs Harbour, NSW 2450, Australia;4. Department of Zoology, School of Environmental and Rural Sciences, University of New England, Armidale, NSW 2350, Australia;1. State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;2. China Kaolin Clay Company, Suzhou 215151, China;3. Zhejiang University Hospital, Hangzhou 310027, China |
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| Abstract: | ![]()
A valid method based on heat-assisted slurry sampling graphic furnace atomic absorption spectrometry (HASS-GFAAS) was developed for the accurate determination of trace Pb in food standard reference materials (SRMs). The HASS technique significantly improved Pb recovery and precision compared to conventional slurry sampling techniques. The optimized HASS procedure was performed as follows: first, the sample (particle size ≤ 150 μm) was diluted with 0.05% (v/v) Triton X-100 containing 2% HNO3 and 1% H2O2 followed by heating for 20 min at 120 °C on a heating block. Next, the obtained slurry was sonicated in an autosampler cup, and finally, the slurry was introduced into a graphite tube and analyzed by the GFAAS with a Pb electrodeless discharge lamp (EDL). Calibration with aqueous standard solutions was used for Pb determination in food samples. The characteristic mass and limit of detection for Pb based on the integrated absorbance for a 2% (m/v) sample were 12 ± 0.6 pg and 0.003 mg kg−1, respectively. The accuracy (95.1–102% recovery) and good precision (0.1–3.6%) of this procedure are illustrated by the results obtained for the 12 food reference materials. The proposed method is suitable for determination of trace Pb in solid food samples. |
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| Keywords: | Food analysis Food composition Heat-assisted slurry sampling Trace element in food Heavy metal contamination Lead Food certified material Method validation Standard reference material |
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