The following data are for a series of extemal standards of Cd² buffered to a pH of 3.7. [Cď*], nM Signal intensity 15.4 15.0 30.4 42.7 44.9 58.5 59.0 77.0 72.7 101 86.0 118 unknown 66.3 Plot the calibration curve and calculate the linear least-squares equation for the data. Determine the concentration of Cd²* in the unknown sample.

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Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.