Measurement and Results - Using IC compound standards for ICP
Is it possible to use salt CRMs, like phosphate and nitrite for ICP applications, or are the for ion chromatography (IC) uses only? In other words, can they all be used with ICP or only the CRMs certified for single atoms such as those denoted “as N” or “as P”?
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If the ICP is capable of measuring emission wavelengths for elements present in an IC standard (e.g., Cl, P, Br, etc.), then the IC standards we provide could be used in ICP applications. The key point is that the plasma destroys the compound (molecule), and the user needs to be aware of what the certified value in the standard represents. For example, a 1000 ppm IC phosphate (PO4) standard is equivalent to 326 ppm P (phosphorus), and converting these concentrations from compound to element is occasionally overlooked. It is also worth noting that the salts of some compounds, such as the KCl often used for chloride (Cl) IC standards, may introduce unwanted interferences in ICP applications, and that it is possible to purchase these standards specifically designed for ICP applications. In this example (KCl), we would recommend a chloride standard manufactured using ammonium chloride (NH4Cl), as it eliminates any issues arising from running high K concentrations through the ICP. |