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Chemical Stability and Compatibility - Matrix and dilution for Cd, Te in dilute sulfuric acid (H2SO4)

 
I have a solution with the following formulation. 500 ml H2O 90 gm CdSO4 0.35 ml HCl 2.5 ml H2SO4 0.23 ml Triton X-102 0.5 gm TeO2 What type of sample matrix would be best to dilute and run in an ICP-MS? And possible dilution factor? Would 1.5% HCl / 0.5% HNO3 be ok?
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The appropriate matrix and dilution factor(s) will depend upon the analytes of interest, their required detection limits, and the matrix of your calibration standards. If Cd and Te are the only elements to be measured, and the concentrated solution you describe is stable, then diluting in 1.5% HCl and 0.5% HNO3 should be suitable. As for the dilution factors, a general rule of thumb for ICP-MS solutions is that total dissolved solids (TDS) should be ~0.2% or less. The solution you describe contains almost 20% TDS, so a minimum dilution factor would be ~100x. You also want to ensure that your samples and calibration standards are matrix-matched as closely as possible, and as you are using a very sensitive method (ICP-MS), significantly higher dilution factors are probably more appropriate.

Posted: 09/02/18 22:29:32

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