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RESIDUE, FILTERABLE Method 160.1 (Gravimetric, Dried at 180°C) STORET NO. 70300 1 Scope and Apphcation 11 ThIS method IS applIcable to drInkIng, surface, and salIne waters, domestIc and IndustrIal wastes 12 ThepractIcalrangeofthedetermInatIOnIS10mg/lto20,000mg/l 2 Summary of Method 21 A well-mIxed sample IS filtered through a standard glass fiber filter The filtrate IS evaporated and drIed to constant weIght at 180°C 22 If ResIdue, Non-FIlterable IS beIng determIned, the filtrate from that method may be used for ResIdue, FIlterable 3 DefimtIOns 3 1 FIlterable resIdue IS defined as those solIds capable of paSSIng through a glass fiber filter and drIed to constant weIght at 180°C 4 Sample HandlIng and PreservatIOn 4 1 PreservatIOn of the sample IS not practIcal, analysIs should begIn as soon as pOSSIble RefrIgeratIon or ICIng to 4°C, to mInImIZe mICrobIOlogIcal decomposItion of solIds, IS recommended 5 Interferences 51 HIghly mIneralIzed waters contaInIng sIgmficant concentratIOns o f calCIUm, magneSIUm, chlOrIde and/or sulfate may be hygroscopIC and WIll requIre prolonged dryIng, desIccation and rapId weIghIng 52 Samples contaInIng hIgh concentratIOns ofbICarbonate wIll reqUIre careful and pOSSIbly prolonged dryIng at 180°C to Insure that all the bIcarbonate IS converted to carbonate 53 Too much reSIdue In the evaporatIng dIsh wIll crust over and entrap water that wIll not be dnven offdunng dryIng Total reSIdue should be hmited to about 200 mg 6 Apparatus 61 62 63 64 6 5 66 67 68 Glass fiber filter dISCS, 4 7 cm or 2 1 cm, wIthout orgamc bInder, Reeve Angel type 934- AH, Gelman type AlE, or eqUIvalent FIlter holder, membrane filter funnel or Gooch cruCIble adapter SuctIon flask, 500 ml Gooch cruCIbles, 25 ml (If 2 1 cm filter IS used) EvaporatIng dIshes, porcelaIn, 100 ml volume (Vycor or platInum dIshes may be SubstItuted) Steam bath DryIng oven, 180°C ±2°C DesIccator Approved for NPDES Issued 1971 160 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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