An optimized sequential extraction scheme for molybdenum association in environmental samples

By comparing three sequential extraction pro- cedures, a new optimized extraction scheme for the molyb- denum association in environmental samples was proposed. Five operational steps were described as exchangeable （KH2PO4 ＋ K2HPO4： including water-soluble）, associated with organic matter （NaOH）, Fe...

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Bibliographic Details
Published in:Acta geochimica 2016-06, Vol.35 (2), p.111-119
Main Authors: Liang, Liang, Zhu, Jian-Ming
Format: Article
Language:English
Subjects:
Earth and Environmental Science
Earth Sciences
Environmental monitoring
Extraction processes
Geochemistry
K2HPO4
Molybdenum
Oil shale
Original Article
优化
关联
提取方案
氧化钼
环境样品
程序交换
黑色页岩
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Summary:By comparing three sequential extraction pro- cedures, a new optimized extraction scheme for the molyb- denum association in environmental samples was proposed. Five operational steps were described as exchangeable （KH2PO4 ＋ K2HPO4： including water-soluble）, associated with organic matter （NaOH）, Fe-Mn oxides and/or carbonates （HC1）, sulfides （H2O2） and residue （HNO3 ＋ HF ＋ H2O2）. An optimized extraction scheme was com- pared with Tessier＇s procedure and the Commission of European Communities Bureau of Reference （BCR） was applied to black shales. Results showed Tessier＇s procedure gave the lowest concentration values for exchangeable molybdenum and the highest values for the residual molybdenum, which could not present the efficiency of the extraction reagents. BCR＇s procedure showed the highest values in oxidizable molybdenum and presented four fractions of molybdenum, which did not demonstrate the fractions of molybdenum in the black shales in detail. The optimized extraction scheme demonstrated a certain improvement on extraction efficiency over Tessier＇s proce- dure for the lowest residual molybdenum, and revealed morefeatured fraction information of molybdenum in black shales than BCR＇ s. Therefore, after a comparison with other two extraction procedures, the optimized extraction scheme proved suitable for the molybdenum in black shales and it also showed an accurate determination of the molybdenum in the fractions and source of bioavailable Mo.
ISSN:1000-9426
2096-0956
1993-0364
2365-7499
DOI:10.1007/s11631-016-0096-4