Holmium oxide can be used for this process in UV-Vis spectroscopy apparatuses. If a spectrometer appears to give poor results in this process, one can conduct a matrix spike experiment to “recover” the results. An example of this process involves adding aliquots of a known (15[1])concentration to a sample, (15[1])then extrapolating (15[1])to find the negative (15[1])x-intercept; that process is the method of (*) standard addition. This type of sensitivity divided by the standard deviation of a signal gives analytical sensitivity. In a Beer’s Law experiment, this process involves generating an absorbance-concentration curve for known standards, (10[1]-5[1])which can then (-5[2])be used to interpolate an unknown concentration based on its signal. For 10 points, name this process of quantifying the relationship between analytical variables and (-5[1])validating the accuracy (10[2])of an instrument. (10[2])■END■ (10[4])