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Sample Preparation - Using UA, UNS product digestions of Ti

 
In our lab we are using your UA-4, UNS-2 solutions for elemental ICP analysis. I have a technical question about the way someone can handle them. I am reading on your web-page that you can dissolve a quantity of 100 mg to 1 0ml of UA-4 (add 0.5 ml of conc. HNO3 and then add -additionally- 50 ml of solution UNS-2). After that you are stating: " adjust the final weight of the solution to 125 to 500 grams". What exactly you mean by that ? Do you mean that someone can continue further a process of dissolving his sample to a total sample volume of 125/500 gr (or approximately 125/500 ml?) ? Should i do that with the use of UNS-2? Or i can use HNO3? The reason i am asking is because, based on my calculations, i would like to adjust mine samples' ppm concentration to a final solvent's solution of 100/200 ml. So, if I dissolve my compound in those 60 ml of (UA-4 / HNO3 / UNS-2) solution, how i can further dilute my sample to a final volume of 200 ml? And a second question. I am intending to try this route of dissolving my compounds because of difficulties I had to dissolve Ti4+ with other routes. My material is not exactly a zeolite but i would like to use your products to see if I can have better results. Do you have anything else to suggest for problems of dissolving Ti4+?My material contains Fe, Bi, Ca, Mg and Ti.
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admin Total posts: 529
The statement "adjust the final weight of the solution to 125 to 500 grams” is intended to indicate an adjustment with deionized water, and we apologize for any confusion. At this point in the digestion process all necessary reagents have been added, and there is no further need to add additional amounts of either the UA-4 or UNS-2 solutions. The idea is that you can simply add as much water at the end of the process as desired to achieve a final concentration of your sample in solution to optimize your analysis. We do not recommend adding additional HNO3 after the UNS-2 solution has been added, as the UNS-2 is intended to neutralize and stabilize the already acidic UA-4 reagent. As Ti is the primary element of interest, the suitability of UA-4 will depend somewhat upon the relative concentrations of the other elements you mention, particularly Ca, Mg, and Fe. If you find that UA-4 is not appropriate, please contact us and we can recommend other UA products (or other digestion techniques) that should prove suitable.
Posted: 09/07/18 02:36:29

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