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Spectrum offers a variety of standard chemical solutions for the determination of concentrations of other substances. The standard chemical solutions are a precisely known concentration of an element or a substance and are also commonly used to determine the concentration of an analyte. By comparing the absorbance of the sample solution, at a specific wavelength, to a series of standard solutions at differing known concentrations of the analyte species. Any form of spectroscopy can be used in this way so long as the analyte species has substantial absorbance in the spectra. Spectrum offers standard chemical solutions for AA, ICP and other forms of detection.