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I am having problems with linearity at a concentration level of 50ppm for some cations. Do you have any suggestions?

April 26, 2017cations concentration level linearity problems suggestions

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I am having problems with linearity at a concentration level of 50ppm for some cations. Do you have any suggestions?

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[top] Because the method used by CElixir-plus utilizes indirect detection, the dynamic range is shorter than it would be with direct detection. I suggest that you look at different concentrations such as between 25ppm and 50ppm to find the higher standard to fit into a straight line of 0, 5, 25ppm (30, 35 40ppm for example). If 50ppm is mandatory then dilute standard and the sample alike 1/2 to fit in the linearity (same dilution of standard and sample to avoid a dilution calculation).