Measurement and Results - Ca and Mg impurities in LACB1
I've been using your AA standards for quite a while now, and have been very pleased with them. I'm interested in your Lanthanum releasing agent, but the COA doesn't tell me how much Ca or Mg is in it. I'm guessing you don't test it for it? Is this supposed to be the same solution using in SM 3111 B-2011 Section 3 Paragraph f (Page 318 of 22nd Edition of SM)? Thank you.
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admin
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The LACB1 product (10,000 ug/mL La in 3% HCl) uses the same lanthanum starting material as our 10,000 ug/mL ICP La standard (CGLA10). We provide trace metal impurity data for the CGLA10 product, and recent lots of that product have approximately 0.13 ug/mL Ca and 0.02 ug/mL Mg present as trace metal impurities. Those values should be representative of the Ca and Mg impurity levels in recent lots of LACB1. As for the Standard Methods application you reference, the LACB1 product would be suitable, though its concentration (10,000 ug/mL La) is less than the 50,000 ug/mL La preparation described in SM, and to follow the SM procedure exactly you would correspondingly need to increase the relative proportion of LACB1 to the sample amount. |