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So my samples froze in my car before I could drop them in the mail. Should it be okay or should I open and recollect? Surely they freeze in transit sometimes right?
Thanks! I did end up getting an official response from ati. Per their email the freezing wouldn't have an impact.That is a tricky issue. Freezing will greatly increase the salinity in the unfrozen water and might induce precipitation of calcium carbonate, which will, in turn, take other things out of the water permanently. Other salts will also precipitate, but most of them will redissolve.
Thanks! I did end up getting an official response from ati. Per their email the freezing wouldn't have an impact.
Sounded fishy to me too. I honestly still sent it off, partly out of curiosity.Which doesn't make sense to me. Don't believe it without further justification.
That is a tricky issue. Freezing will greatly increase the salinity in the unfrozen water and might induce precipitation of calcium carbonate, which will, in turn, take other things out of the water permanently. Other salts will also precipitate, but most of them will redissolve.
If your sample freezes, what elements would you pay no attention to?
My primary concern before I found out the form of calcium carbonate that forms is unstable and will redissolve was for elements that get incorporated as impurities in calcium carbonate but that start low to begin with, so a little uptake into crystals might take out a substantial portion of them. I've not really looked to see which are most prone to this issue, but trace metals in general.
So a frozen sample wont effect the major elements, just trace metals, correct? Mine was shipped and it was -40 c back then. So id expect it would freeze.
Will do. But I do have some issues in the tank currently so it's kind of bummer knowing this could mess with the resultsIf you get your test redults back please post them here
Im having an issue with mine that froze and id be curious if yours is strangely off too.
http://lab.atiaquaristik.com/share/540a92b8b0366107af30Will do. But I do have some issues in the tank currently so it's kind of bummer knowing this could mess with the results
IMHO to deliver meaningful analysis data the ICP providers need to acidify the samples prior to measurement. Even if precipitation of CaCO3 would occur in partly frozen water everything should redissolve nicely once acidified.
Best,
Christoph
Could we do this ourselves before sending it off?