Re: [Ifeffit] P K-edge XANES spectrum question (Mangold, Stefan (IPS))- (Mike Massey); Re: Ifeffit Digest, Vol 212, Issue 7 (Luis Carlos Colocho Hurtarte)

2020-10-16 Thread Ganga Hettiarachchi 
Mike,
Thanks, we will try diluted samples to make sure that this is not an issue due 
to concentration.

Luis,
Thanks for sharing those papers. We have plenty of OC in these systems, but Pb 
or other trace elements concentrations are very small (below 10 mg/kg).

Best regards,

Ganga



Ganga M. Hettiarachchi

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Re: [Ifeffit] P K-edge XANES spectrum question (Mangold, Stefan (IPS))

2020-10-16 Thread Mike Massey 
Yes I was wondering about this as well. Technically P(III) exists, and maybe 
one could find it in an AMBR? But I don't think anyone has a clue about what 
the K-edge XANES spectrum looks like.

Has anyone ever collected a phosphite spectrum? That would be pretty cool. I 
would totally do it but I'm not in a position to collect new synchrotron data 
anymore...



Mike



> On Oct 17, 2020, at 10:59 AM, Ganga Hettiarachchi  wrote:
> 
> 
> Stefan,
> Thanks for sharing your thoughts. Please share if you do have spectra for any 
> other P (i.e., not +5).
>  
> 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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Re: [Ifeffit] P K-edge XANES spectrum question (Mangold, Stefan (IPS))

2020-10-16 Thread Ganga Hettiarachchi 
Stefan,
Thanks for sharing your thoughts. Please share if you do have spectra for any 
other P (i.e., not +5).

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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Re: [Ifeffit] P K-edge XANES spectrum question

2020-10-16 Thread Mangold, Stefan (IPS) 
My2Cents,

strange features in spectra can be also induced by mixtures of different 
species (especially from different oxidation states, especially at low energies)

best regards

Stefan Mangold


Karlsruhe Institute of Technology (KIT)


Am 16.10.2020 um 07:26 schrieb Ganga Hettiarachchi 
mailto:ga...@ksu.edu>>:

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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Re: [Ifeffit] P K-edge XANES spectrum question

2020-10-16 Thread Mike Massey 
I recommend diluting this sample by a lot (20x maybe, or more) and collecting 
another spectrum. I've had instances of strange features in P spectra that 
ended up being weird self-absorption type artifacts.

I will dig through the spectra I have from similar samples, this one reminds me 
of a spectrum I saw once, perhaps in a similar system...It would be interesting 
if we inadvertently got similar results. Thanks for sharing!



Mike





> On Oct 16, 2020, at 10:22 PM, Dean Hesterberg  
> wrote:
> 
> 
> 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  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_hesterb...@ncsu.edu
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Re: [Ifeffit] P K-edge XANES spectrum question

2020-10-16 Thread Dean Hesterberg 
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  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_hesterb...@ncsu.edu
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[Ifeffit] P K-edge XANES spectrum question

2020-10-15 Thread Ganga Hettiarachchi 
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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