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COLOR Method 110.3 (Spectrophotometric) 1 Scope and ApphcatlOn 1 1 ThIS method IS apphcable to drInkIng, surface, and sahne waters, domestIc and Industnal wastes It must be used for Industnal wastes that cannot be determIned by the PlatInum- Cobalt method 2 Summary ofMethod 21 Color charactenstIcs are measured at pH 7 6 and at the ongmal pH by obtaInIng the VISIble absorptIOn spectrum of the sample on a spectrophotometer The percent transmISSIOn at certam selected wavelengths IS used to calculate the results 22 The results are expressed m terms of dommant wavelength, hue, lumInance, and punty 3 Interferences 3 1 Smce very shght amounts of turbIdIty mterfere wIth the determInatIOn, samples must be filtered before analysIs 4 Sample Handhng and PreservatIon 4 1 Smce bIOlogICal actiVIty may change the color charactenstics of a sample, the determmatlOn should be made as soon as possIble RefngeratIOn at 4°C IS recommended 5 Reference 5 1 The procedure to be used for thIS determmatlOn IS found m Standard Methods for the ExammatlOn ofWater and Wastewater, 14th EdItIOn, p 66, Method 204B (1975) Approved for NPDES Issued 1974 110 3-1 STORET NO. 00080PDF Image | Methods for Chemical Analysis of Water and Wastes
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