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[Determination of lead in edible salt with solid-phase extraction and GFAAS]
Xin Zhao1, Shuang Zhou, Lan Ma
1National Center for Risk Assessment of Food safety, Beijing 100021, China. jingjiangxuan@126.com
Objective:
Establishing a method for determination of lead in salt with solid-phase extraction and GFAAS.
Methods:
Salt sample was diluted to a certain volume directly with ammonium acetate, then the sample solution was filtered through the solid phase extraction column which has been pre-activated. Lead ions were retained, and the sodium chloride matrix was removed. After elution, the collected lead ions was determined by graphite furnace atomic absorption spectrometry in 257.4 nm.
Results:
This method can be used effectively to wipe off the sodium chloride in matrix. The limit of detection was 0.7 microg/kg and the limit of quantification was 2 microg/kg.
Conclusion:
Solid phase extraction technique can be used effectively to reduce the interference in matrix and improves the accuracy and reproducibility of detection.
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