Publication: Field-flow fractionation-inductively coupled plasma mass spectrometry: An alternative approach to investigate metal-humic substances interaction
Issued Date
2005-05-01
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ISSN
0013936X
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2-s2.0-18344392345
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Mahidol University
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SCOPUS
Bibliographic Citation
Environmental Science and Technology. Vol.39, No.9 (2005), 3295-3301
Suggested Citation
Atitaya Siripinyanond, Sumattana Worapanyanond, Juwadee Shiowatana Field-flow fractionation-inductively coupled plasma mass spectrometry: An alternative approach to investigate metal-humic substances interaction. Environmental Science and Technology. Vol.39, No.9 (2005), 3295-3301. doi:10.1021/es0483802 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/16517
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Title
Field-flow fractionation-inductively coupled plasma mass spectrometry: An alternative approach to investigate metal-humic substances interaction
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Abstract
Interaction between metal ions and humic matter was investigated using a hyphenated technique, field-flow fractionation-inductively coupled plasma mass spectrometry (FFF-ICP-MS). Aggregation of a metal-spiked commercial Aldrich humic acid in an aqueous solution of calcium ion or in seawater was examined over time intervals of 0-4320 min. The aggregation was demonstrated by shifts in peak maximum of humic matter from smaller size (2.9 nm) to larger size (5.1 or 5.8 nm in Ca2+ solution or in seawater, respectively) and also by the broadening of size distribution profiles. With FFF, size distribution of humic aggregate was characterized. Further, dominant particle size (2.9 nm), mean particle size (3.8 nm), and diffusion coefficient (1.51 × 10-6 cm2/s) of humic acid solution were determined. With FFF-ICP-MS, associations of Cd, Cu, and Pb with humic aggregates were examined. The mean diameters of Cd-, Cu-, and Pb-bound humic aggregates in the metal-spiked humic acid were 4.1, 4.5, and 5.8 nm, respectively. These diameters were shifted to 6.0, 6.0, and 6.9 nm, respectively, in the humic acid incubated with calcium solution, whereas they were shifted to 6.5, 5.7, and 7.4 nm, respectively, in the humic acid incubated with seawater for three days. Humic aggregate of small size showed more affinity for Cu than Cd and Pb, whereas the large aggregate showed more affinity for Pb than Cd and Cu, respectively. © 2005 American Chemical Society.