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RESIDUE, TOTAL Method 160.3 (Gravimetric, Dried at 103-105°C) STORET NO. 00500 1 Scope and ApphcatIOn 1 1 ThIS method IS apphcable to dnnkmg, surface, and salIne waters, domestIc and mdustrIal wastes 12 ThepractIcalrangeofthedetermmationISfrom10mg/1to20,000mg/1 2 Summary of Method 2 1 A well mIxed alIquot of the sample IS quantItatIvely transferred to a pre-weIghed evaporatmg dISh and evaporated to dryness at 103-105°C 3 DefinItIOns 3 1 Total ReSIdue IS defined as the sum of the homogenous suspended and dIssolved materIals m a sample 4 Sample HandlIng and PreservatIOn 4 1 PreservatIon of the sample IS not practIcal, analysIs should begm as soon as possIble RefngeratIon or Icmg to 4°C, to mmimize mICrobIOlogIcal decomposItIon of sohds, IS recommended 5 Interferences 51 Non-representatIve partIculates such as leaves, stIcks, fish and lumps of fecal matter should be excluded from the sample IfIt IS determmed that their mclUSIOn IS not deSired m the final result 52 Floatmg 011 and grease, If present, should be mcluded m the sample and dIspersed by a blender deVice before alIquotmg 6 Apparatus 61 Evaporatmg dishes, porcelam, 90 mm, 100 ml capacity (Vycor or platmum dishes may be substItuted and smaller size dishes may be used IfreqUIred) 7 Procedure 71 Heat the clean evaporatmg dish to 103-105°C for one hour, If Volatlle ReSIdue IS to be measured,heatat550 ±50°Cforonehourmamufflefurnace Cool,deSIccate,weIghand store m desIccator untll ready for use 72 Transfer a measured alIquot ofsample to the pre-weIghed dIsh and evaporate to dryness on a steam bath or m a drymg oven 7 2 1 Choose an alIquot of sample suffiCient to contam a reSIdue of at least 25 mg To obtam a weIghable reSIdue, succeSSIve alIquots ofsample may be added to the same dISh 7 2 2 If evaporation IS performed m a drymg oven, the temperature should be lowered to approxImately 98°C to prevent bollmg and splattermg ofthe sample Approved for NPDES Issued 1971 1603-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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