Document Detail

Trace Rare Earth Elements Detection in Food and Agricultural Products Based on Walnut Shell Packed Microcolumn Preconcentration Coupled with Inductively Coupled Plasma Mass Spectrometry.
MedLine Citation:
PMID:  22390234     Owner:  NLM     Status:  Publisher    
With the extensive use of rare earth elements (REEs) in industry and agriculture as fertilizer and feed additives, the concentration of REEs has increased in environmental and biological samples and finally impaired human health by food chain accumulation. The determination of trace concentrations of REEs has gained a considerable importance because of its toxicity and increasing occurrence. In this work, walnut shell has been used as the green adsorbent in on-line preconcentration and detection of REEs in food and agricultural products coupled with inductively coupled plasma mass spectrometry (ICP-MS). Thanks to the porous surface and abundant -COO- group on the walnut shell surface, the walnut shell packed microcolumn behave high adsorption efficiency and high tolerable capacity for co-existing ions. Under the optimized conditions, the adsorption efficiency of the walnut shell packed microcolumn was as high as 98.9% for 15 REEs and the tolerable concentration ratios was between 2000 and 80000000 for 37 kinds of coexisting interfering ions. The enhancement factors were achieved 79-102 for 16 REEs with a sample loading volume of 4.7 mL. The detection limits were in the range of 0.01-0.17 ng L-1. The relative standard deviation for 11 replicate preconcentrations of 2.5 ng L-1 REEs solution ranged from 0.5% to 2.0%. The present method was successfully applied to selective determination of REEs in four environmental and biological certified reference materials and 18 locally collected food and agricultural products.
Yan Li; Jia-Lin Yang; Yan Jiang
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-5
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  -     ISSN:  1520-5118     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-3-6     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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