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absorbing absorption band absorption cells acid amount analytical applications Beer's law Brode buffer solutions calculated cent characteristics Chem chemical chlorophyll color standards color-forming reagents colored system colorimetric comparator components concentration conforming to Beer's containing depth designed desired constituent determined diagram didymium dilution dominant wavelength effect error example extinction coefficient filter photometers given wavelength glass graph illuminant indicator intensity interfering ion iron known laboratory light source liquid Lovibond manganese match materials measurement mittancy molecular extinction coefficient monochromatic monochromator Nessler tubes noted obtained operation optical density Optical Soc permanganate photocell photoelectric instruments plotting possible potassium potassium dichromate potassium permanganate prism purity quantitative radiant energy range reaction readings reliable sample scale selected sensitivity shows slit solvent spectral band width spectral transmittance curves spectrophotometer stimulimeter Table thickness Tintometer tion trans transmittance or reflectance trichromatic tristimulus ultraviolet unknown solution visual instruments Zscheile