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Technical Questions Forum

Whether you need detailed assistance or quick troubleshooting, Inorganic Ventures, the standardology experts, is here to help. We're eager to assist chemists with hundreds of topics ranging from problem elements to calculations. The links below showcase real-world technical problems along with solutions provided by our in-house experts.

 
Forum Total Topics Total Posts Latest Reply
130 134
Sample Recovery- Open-cup evaporation
Sample Preparation
Posted: 08/19/19 11:23:50
145 147
Low selenium recoveries for SW-846 6010C
Posted: 08/19/19 14:07:48
80 83
143 148
Stability of diluted standards
In our preparation for ICP-MS analysis of USP <232> elements, we perform an intermediate dilution of a 14 element blend. This is a 1:20 dilution to give concentrations (ug/mL, ppm) as follows: Cu = 65, Ni = 30, Mo = 9, V = 6, Cd = 0.25, Hg = 0.75, Pb = 0.25, As = 0.75, Ir = 5, Pd = 5, Pt = 5, Rh = 5, Ru = 5, Co = 2.5. I have viewed information at http://inorganicventures.com/stability-elements-ppb-concentration-levels, which has pointed me in the right direction and is the kind of information I’m looking for, except that our intermediate is at much greater concentrations. I am wondering if you can provide any information regarding the stability of this solution in a 5% nitric acid (HNO3), 1% hydrochloric acid (HCl) solution? If possible, I'm also interested in stability information for a 10 ug/L (ppb) mixture of In, Bi, 6-Li, Y, Sc, and Tb in 3% HNO3.
Posted: 09/03/18 22:45:15
4 5
Stabilizing Si with HF and acid digestions
I recently ordered a 1000 ppm standard of SiO2 for testing on my MP-AES. The label on the standard says there is trace amounts of hydrofluoric acid; does this help the Si stay in solution? If so, are you aware of how accurate an acid digestion for Si would be without the use of HF?
Posted: 09/06/18 22:19:12