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1 Scope and ApphcatlOn 1 1 The Platmum-Cobalt method IS useful for measunng color of water denved from naturally occurnng matenals, 1 e , vegetable resIdues such as leaves, barks, roots, humus and peat matenals The method IS not apphcable to color measurement on waters contammg hIghly colored mdustnal wastes See ADMI color method m thIS manual NOTE 1. The Spectrophotometnc and Tnstlmulus methods are useful for detectmg specIfic color problems The use of these methods, however, IS labonous and unless determmatlOn ofthe hue, punty, and lummance IS desIred, they are ofhmlted value COLOR Method 110.2 (Colorimetric-Platinum-Cobalt) 2 Summary of Method 2 1 Color IS measured by vIsual companson of the sample wIth platmum-cobalt standards One umt of color IS that produced by 1 mg/1 platmum m the form of the chloroplatmate lOn 3 Interferences 3 I Smce very shght amounts of turbIdIty mterfere wIth the determmatlOn, samples showmg vIsible turbidity should be clarIfied by centnfugatlOn 3 2 Method IS pH dependent 4 Sample Handhng and PreservatIon 4 I Representative samples shall be taken m scrupulously clean glassware 4 2 Smce blOlogICal actIVity may change the color charactenstlcs of a sample, the determmatlOn should be made as soon as possIble RefngeratlOn at 4°C IS recommended 5 Apparatus 5 I Nessler tubes Matched, tall form, 50 ml capacIty 6 Reagents 6 1 Standard chloroplatmate solutlOn DIssolve I 246 g potaSSIUm chloroplatmate, K2PtCI6, (eqUIvalent to 0 500 g metalhc Pt) and 1 g crystalhne cobaltous chlonde, CoCI2-H20, m dIstilled water contammg 100 ml of conc HCI Dilute to 1000 ml With dIstilled water This standard solutlOn IS eqUIvalent to 500 color umts 7 Preparation ofStandards 7 1 Prepare standards m mcrements from 5 to 70 umts The followmg sene,s IS suggested Approved for NPDES Issued 1971 1102-1 STORET NOS. TRUE COLOR 00080 APP ARENT COLOR 00081PDF Image | Methods for Chemical Analysis of Water and Wastes
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