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Humic Acid Facilitates the Transport of ARS-Labeled Hydroxyapatite Nanoparticles in Iron Oxyhydroxide-Coated Sand

Overview of attention for article published in Environmental Science & Technology, February 2012
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67 Mendeley
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Title
Humic Acid Facilitates the Transport of ARS-Labeled Hydroxyapatite Nanoparticles in Iron Oxyhydroxide-Coated Sand
Published in
Environmental Science & Technology, February 2012
DOI 10.1021/es203784u
Pubmed ID
Authors

Dengjun Wang, Scott A. Bradford, Ronald W. Harvey, Bin Gao, Long Cang, Dongmei Zhou

Abstract

Hydroxyapatite nanoparticles (nHAP) have been widely used to remediate soil and wastewater contaminated with metals and radionuclides. However, our understanding of nHAP transport and fate is limited in natural environments that exhibit significant variability in solid and solution chemistry. The transport and retention kinetics of Alizarin red S (ARS)-labeled nHAP were investigated in water-saturated packed columns that encompassed a range of humic acid concentrations (HA, 0-10 mg L(-1)), fractional surface coverage of iron oxyhydroxide coatings on sand grains (λ, 0-0.75), and pH (6.0-10.5). HA was found to have a marked effect on the electrokinetic properties of ARS-nHAP, and on the transport and retention of ARS-nHAP in granular media. The transport of ARS-nHAP was found to increase with increasing HA concentration because of enhanced colloidal stability and the reduced aggregate size. When HA = 10 mg L(-1), greater ARS-nHAP attachment occurred with increasing λ because of increased electrostatic attraction between negatively charged nanoparticles and positively charged iron oxyhydroxides, although alkaline conditions (pH 8.0 and 10.5) reversed the surface charge of the iron oxyhydroxides and therefore decreased deposition. The retention profiles of ARS-nHAP exhibited a hyperexponential shape for all test conditions, suggesting some unfavorable attachment conditions. Retarded breakthrough curves occurred in sands with iron oxyhydroxide coatings because of time-dependent occupation of favorable deposition sites. Consideration of the above effects is necessary to improve remediation efficiency of nHAP for metals and actinides in soils and subsurface environments.

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Mendeley readers

The data shown below were compiled from readership statistics for 67 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
United States 1 1%
Brazil 1 1%
Unknown 65 97%

Demographic breakdown

Readers by professional status Count As %
Student > Master 15 22%
Student > Ph. D. Student 11 16%
Researcher 9 13%
Student > Doctoral Student 7 10%
Student > Bachelor 5 7%
Other 12 18%
Unknown 8 12%
Readers by discipline Count As %
Environmental Science 17 25%
Engineering 14 21%
Agricultural and Biological Sciences 8 12%
Chemistry 6 9%
Earth and Planetary Sciences 3 4%
Other 6 9%
Unknown 13 19%

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 09 February 2012.
All research outputs
#2,015,492
of 3,630,679 outputs
Outputs from Environmental Science & Technology
#2,335
of 3,909 outputs
Outputs of similar age
#100,592
of 230,272 outputs
Outputs of similar age from Environmental Science & Technology
#68
of 125 outputs
Altmetric has tracked 3,630,679 research outputs across all sources so far. This one is in the 25th percentile – i.e., 25% of other outputs scored the same or lower than it.
So far Altmetric has tracked 3,909 research outputs from this source. They typically receive more attention than average, with a mean Attention Score of 7.8. This one is in the 25th percentile – i.e., 25% of its peers scored the same or lower than it.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 230,272 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 38th percentile – i.e., 38% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 125 others from the same source and published within six weeks on either side of this one. This one is in the 25th percentile – i.e., 25% of its contemporaries scored the same or lower than it.