Abstract
If least squares analytical curves for Inductively Coupled Argon Plasma-Atomic Emission Spectrometry (ICAP-AES) that cover the entire linear working range are plotted under the assumption of equal weights for all of the calibration standards, severe errors can occur. A systematic study of the relationship between concentration and the standard deviation of the resulting net line intensity revealed that the concentration range that can be calibrated by one and the same analytical curve is limited under three orders of magnitude. From the results of analytical curves based on large numbers of measurements, it appeared that a linear scale is required for the lower concentration range, and a logarithmic scale for the upper range. The analytical implications of these transformations of scale are discussed on the basis of the width of confidence intervals along the analytical curves.
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