Chemical Stability and Compatibility

I am a researcher looking to make a custom standard. I am looking for an appropriate internal standard for quantifying chlorate samples. I currently have access to a chlorate standard (ICCLO31, 1000 ppm) and a perchlorate standard (ICCLO41, 1000 ppm). Both solutions are made in water. Can I mix these two ions into one standard solution for a calibration curve?

Which bottles do you recommend if we are planning on storing on standards that are prepared in 2% HNO3?

Is it possible to prepare a mixture of these elements (Ni, As, Pb, Hg, Co, Cd) in one solution using 2% HNO3? Would there be any problems using ICP-MS with the same matrix?

My question is in regard to the Interactive Periodic Table stability information. Mostly months are used to describe stability with a few cases of 2 months, 5 months, etc.; would it be accurate to infer that months may mean 6 months?

We purchase customized standard solutions from your company for our ICP-OES. Among one of those solutions, we order 10,000ug/mL Yttrium in 2% (v/v) HNO3 (catalog # CGY10) that we use as our internal standard. A couple of weeks ago, we started getting 170-200 percent recoveries for Yttrium, although everything was prepared the same. We have not had any issues in the past regarding this and I am curious to know the reason why our internal standard recovery were so high. Do you have any knowledge of the reactivity of Yttrium over time? Have you had any other customers that experienced something similar? We use Yttrium because it is inert and classified as a rare earth elements therefore we would not expect to find it among our materials. Any information you can provide is greatly appreciated.

Could there be differences in ICP-MS response depending on the starting material of Hg, for example Hg metal and HgO, both at 1000 ppm in solution? In a separate matter, we use one method that says for Sb analysis HCl should be added for complexing. What about complexing Sb with HF or tartaric acid?

I will be making a 25 and 50 ppb standards in 2% HNO3 from the two multi-element standards that I ordered. Do you have any information on how long these standards should be stable? Ball park answer is fine, like 1 week, 1 month or several months?

I just had a question regarding mercury stability in plastic containers. I've read your paper on mercury chemical stability and had a question regarding the use of "over time". Would this mention of time be within the day of preparation? I will likely do some studies of my own, but wanted to get your take on how volatile mercury is over time. Are we talking about within the hour or would the use of "over time" be over a period of a few days? Generally speaking, we do analyze preparations on the ICP-MS on the same day of preparation, but in some cases we may need to analyze them the next day. I use approximately 1 ppm of Au as a stabilizer in a 2% - 5% HNO3 matrix. But, I do have a sample of sodium chloride where I was hoping to just solubilize the NaCl in 2% HNO3 and run it without worrying about use of a stabilizer. Do you think that is plausible, or would your experience with mercury instability still warrant using Gold to stabilize the mercury in solution?

I added the following single element standards (1000 ppm Er, I, In, Nb, Nd, Pd, Rb, Ru, S, Sb, Sc, Zr) to a solution containing HNO3 / HCl, which I then diluted to a concentration of 1% HNO3 / 0.5% HCl. Standards were at a final concentration of 10 ppm each. Overnight a precipitate formed in the flask. Could you tell me which element or elements it is that may be falling out?

Your iodine solutions come in 1% TEA - if we are diluting the solution we get from you (from 1 ug/mL down to 10ng/mL), should we use a 1% TEA solution? Will that help stabilize those lower concentrations or is it only needed for higher (1000ug/mL) concentrations?