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COLOR Method 110.1 (Colorimetric, ADMI) STORET NOS. 00082 at pH 7.6 00083 at ORIGINAL SAMPLE pH 1 Scope and ApphcatlOn 1 1 ThIs method IS apphcable to colored waters and waste that have color charactenstlcs slgmficantly dIfferent from the yellow plattnum-cobalt standard 1 2 A workmg range of 25 to 250 color umts IS recommended Sample values above 250 umts may be determmed by quantttatlve dtlutton 2 Summary of Method 2 1 2 2 ThIs method IS an extenslOn of the Tnstlmulus Ftlter Method l Tnstlmulus values are converted to an ADMI smgle number color dIfference, of the same magmtude assIgned to platmum-cobalt standards, usmg the Adams NIckerson Color DIfference (DE) l Tnstlmulus values obtamed by Spectrophotometnc Method 204B may be used to calculate ADMI values as outhned m thIs procedure under CalculatIon 9 2 3 Interferences 31 Smce very shght amounts of turbIdIty mterfere wIth the determmatlon, turbId samples must be filtered prlOr to analysIs The optImum filter medIa to remove turbIdIty wIthout removmgcolorhasnotbeenfound MembraneandglassfiberfilterswIthfunctlOnalpore sIzes of approxImately 0 45 u are convement to use Other techmques such as centnfugmg and/or filter aIds may be used 4 Sample Handhng and PreservatIon 4 1 Smce blOlogical 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 CahbratlOn 51 Standard curves must be estabhshed (as outhned In Procedure 8 3) for each photometer used, and are not Interchangeable For color values less than 250, a 5 cm cell path IS recommended Lessthan5cmcellpathsmaybeusedIfcahbratlOnISperformedwIththe shorter cell 6 Apparatus 6 1 Spectrophotometer or filter photometer capable of transmiSSlOn measurements usmg tnstImulus filters hsted below Approved for NPDES Issued 1978 110 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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