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Chemical Stability and Compatibility - Metal stability in trace acid

 
We will be preparing a 10L solution of various metals to test filtration efficiency. The metals to be included are Al, Sb, As, Ba, Be, Cd, Ca, Cr, Cu, Pb, Mg, Hg, K, Se, Ag, Tl, Zn. Chlorine and Fluoride will also be added. Concentrations will be anywhere from 0.02mg/L to 90mg/L depending on the metal. Due to the nature of the system being tested, the solution must be made with water. Acid can be added prior to analysis, but not during the preparation of the 10L solution. There will, however, be trace levels of acid because we are using individual standards purchased through Inorganic Ventures. Do you have any advice on which order to add the metals?
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admin Total posts: 529

We’re assuming that all of the metal standards purchased are in HNO3, and the good news is that nitrates of these metals are all soluble in water, though Sb typically requires some fluoride as a complexing ligand. If the solution is prepared and used immediately, then order of addition should not matter too much at these concentrations levels, though our greatest concerns regarding instability would concern: 1) Ag in the presence of chlorine, 2) Hg in the presence of plastics at low (<10 ppm) concentrations, and 3) at circum-neutral pH values many cationic metals can form insoluble compounds with As and Se.

Posted: 09/02/18 21:24:34

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