Zircon(ZrO2) and Rutile(TiO2) are minerals containing zirconium and titanium respectively, its digestion is not so easy. Can anybody suggests the proper digestion procedure for these minerals?
Zr and Ti are no rare earth elements. I would sggest to dissolve these oxides using alkaline media as they are not soluble in acidic conditions. Use cabonate solutions. If you do need to do it in acidic conditions you would have to add complexing molecles.
Again, Ti and Zn are NOT rare earth elements. I don't know what you mean by "digestion." If you mean reduction of the oxides to the metals themselves, then take a look at e.g.
http://www.jim.or.jp/journal/e/pdf3/48/08/2244.pdf
and
http://www.beilstein-journals.org/bjnano/content/pdf/2190-4286-2-23.pdf
Otherwise, do as I did an type "reduction of tio2" and "reduction of zro2"
into the google search box for more reduction methods.
No, Zr and Ti are not "rare earth elements"... The brute force would be HF (caution!) or try HClO4 digestion... (caution!)
We realized that TiO2 is acting a bit like polyheterometallates. So, in acid (but not hyperstrong or cc.) it will dissolving slowly to a TixO3x+1 (usually this is the formula, but not every case), in alkaline soltion (e.. NaOH) it will transfer to Na2Ti3O7 which is remainig in solid phase. I suggest 3 M HCl.
You might want to look at the 2007 paper on microwave-assisted digestion of TiO2 at
https://eis.hu.edu.jo/deanshipfiles/pub10481181.pdf
Again, you will find lots of help by simply doing a Google search of
either "digestion of tio2" and "digestion of zro2".
Take a look this paper for the analysis of TiO2 in environmental samples:
http://www.sciencedirect.com/science/article/pii/S0025326X13005754
I have not been involved with the newer lab techniques as suggested above, but thirty years ago, we dissolved zircons (for U-Pb analysis) in teflon-lined bombs in oven (to raise T and P) with concentrated acids HF, HCl, and HNO3. Older zircons generally dissolved in 2-6 days, younger zircons (less damage from U fission) could take 1-6 weeks. If interested I could get out my old files with details.
None of us bothered to ask why you want to accomplish digestion. If it is in order to do quantitative elemental analysis, it may not be necessary. Solid samples can be analyzed directly by atomic absorption spectroscopy--IF--the instrument is equipped with an ELECTROTHERMAL ATOMIZER. Quoting from the link below:
"This technique has the advantage that any kind of sample, solid, liquid or gaseous, can be analyzed directly. Its sensitivity is 2–3 orders of magnitude higher than that of flame AAS, so that determinations in the low μg L-1 range (for a typical sample volume of 20 µL) and ng g-1 range (for a typical sample mass of 1 mg) can be carried out. It shows a very high degree of freedom from interferences, so that ET AAS might be considered the most robust technique available nowadays for the determination of trace elements in complex matrices."
https://en.wikipedia.org/wiki/Atomic_absorption_spectroscopy#Electrothermal_atomizers
hi, just for information: ZrO2 is not ZIRCON (Silicate..)!!!!! but another mineral species called BADDELEYITE !!
Best choice is alkali sintering (for instance LiBF4) before digestion.
Hi, I have used H2O2, H2SO4, and HNO3 mixture to digest TiO2, I know it was not easy... But this mixture is safer than HF. If you are still interested in, you can have a look at this paper.
Article Effects of the exposure of TiO2 nanoparticles on basil (Ocim...
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