Chemical Stability and Compatibility - Amount of HF in stock standards
I need to know the exact concentration of HF in the CGHF1, CGNB1, and CGTA1 standards and if I can mix the three solutions.
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admin
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The amount of free HF present in these products is approximately 0.1% (v/v) or lower (the majority of fluoride present exists as fluoride-metal complexes). The ‘exact’ value is not known due to complexation/dissociation reactions that are continuously occurring between fluoride and the metals in solution. These three products can be mixed together at working levels in dilute (1-5%) HNO3, though long term stability of the mixtures will be enhanced by the addition of trace amounts (0.1% v/v) of HF.
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