[Ifeffit] P K-edge XANES spectrum question

Dean Hesterberg dean_hesterberg at ncsu.edu
Fri Oct 16 04:21:58 CDT 2020


Hello Ganga,

That is a very interesting spectrum. Given what you said about the system,
the lower energy feature at ~ 2146 eV should be Fe(III)-bonded phosphate
and the feature at ~2149 eV should be Al(III)-bonded phosphate. Both
produce pre-white line absorption peaks, but the Al-bonded phosphate peak
is closer to the white line and less distinct in spectra of Al-phosphates
like variscite and non-crystalline Al-phosphate, for example (see Khare et
al. 2007. *Geochimica et Cosmochimica Acta* 71:4405, Fig. 5C). A
significant proportion of the phosphate in your system apparently
precipitated with Al-13 polymer structures in the aluminum chlorohydrate.

Dean

On Fri, Oct 16, 2020 at 1:26 AM Ganga Hettiarachchi <ganga at ksu.edu> wrote:

> All,
>
> Can anyone provide some insight into the pre-edge “features” in this P
> XANES spectrum?
>
> This is the P XANES spectrum we got for a recovered P-product (rich in Fe
> and Al) from wastewater using the AnMBR technology. During the coagulation
> process, our collaborators (environmental engineers) used stock solutions
> of aluminum chlorohydrate (ACH) and FeCl3.
>
>
>
> Thanks very much.
>
>
>
> Best regards,
>
>
>
> Ganga
>
>
>
> --------------------
>
>
>
> Ganga M. Hettiarachchi, Ph.D.
>
> Professor of Soil and Environmental Chemistry
>
> Department of Agronomy
>
> 2107 Throckmorton Plant Sciences Center
>
> 1712 Claflin Road
>
> Kansas State University
>
> Manhattan, KS 66506 USA
>
>
>
> 785-532-7209 (office)
>
> 785-532-6094 (FAX)
>
>
>
>
> http://www.agronomy.k-state.edu/research/soil-and-environment/soil-environment-chem/
>
>
> http://www.agronomy.k-state.edu/people/faculty/hettiarachchi-ganga/index.html
>
>
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-- 
DEAN HESTERBERG
William Neal Reynolds Distinguished Professor of Soil Chemistry
Dept. of Crop and Soil Sciences
NC State University

email: dean_hesterberg at ncsu.edu
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