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RESIDUE, VOLA TILE Method 160.4 (Gravimetric, Ignition at 550°C) STORET NO. Total 00505 Non-Filterable 00535 Filterable 00520 1 Scope and ApplicatIon 1 1 ThIS method determmes the weIght ofsolid matenal combustIble at 550°C 1 2 The test IS useful m obtammg a rough approxlffiatlOn of the amount of orgalllc matter present m the solid fractlOn of sewage, actIvated sludge, mdustnal wastes, or bottom sedIments 2 Summary of Method 2 1 The resIdue obtamed from the determmatlOn of total, filterable or non-filterable resIdue IS19l1ltedat550°Cmamufflefurnace ThelossofweIghton19l1ltlOnISreportedasmg!1 volatl1e resIdue 3 Comments 31 The test IS subject to many errors due to loss of water of crystallizatlOn, loss of vo1atl1e orgalllc matter prIor to combustlOn, mcomp1ete oXldatlOn of certam complex orgalllcs, and decomposltlon of mmera1 salts dunng combustlOn 32 The results should not be conSIdered an accurate measure of orgalllc carbon m the sample, but may be useful m the control ofplant operatlOns 33 The prmclpa1 source of error m the determmatlOn IS fallure to obtam a representatIve sample 4 Sample Handhng and PreservatlOn 4 1 PreservatlOn of the sample IS not practiCal, analysIs should begm as soon as pOSSIble RefngeratlOn or lcmg to 4°C, to mmlmlze miCroblOlogiCal decompostlOn of solids IS recommended 5 PreclSlon and Accuracy 5 I A collaboratIve study mvolvmg three laboratones exammmg four samples by means of ten replicates showed a standard devlatlOn of ±11 mg/l at 170 mg/l volatlle resIdue concentratlOn 6 Reference 6 I The procedure to be used for thIS determmatlOn IS found m Standard Methods for the ExammatlOn of Water and Wastewater, 14th EdltlOn, p 95, Method 208E, (1975) Approved for NPDES Issued 1971 1604-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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