Methods for Chemical Analysis of Water and Wastes

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Methods for Chemical Analysis of Water and Wastes ( methods-chemical-analysis-water-and-wastes )

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RESIDUE, NON-FILTERABLE Method 160.2 (Gravimetric, Dried at 103-105°C) STORET NO. 00530 1 Scope and ApphcatIOn 1 1 ThIS method IS apphcable to dnnkmg, surface, and sahne waters, domestic and mdustnal wastes 12 ThepracticalrangeofthedetermmationIS4mg/lto20,000mg/l 2 Summary ofMethod 2 1 A well-mIxed sample IS filtered through a glass fiber filter, and the reSIdue retamed on the filter IS dned to constant weIght at 103-105°C 2 2 The filtrate from thIS method may be used for ResIdue, FIlterable 3 DefimtIOns 3 1 ResIdue, non-filterable, IS defined as those sohds WhICh are retamed by a glass fiber filter and dned to constant weIght at 103-105°C 4 Sample Handhng and PreservatIon 41 Non-representatIve partIculates such as leaves, stIcks, fish, and lumps of fecal matter should be excluded from the sample If It IS determmed that theIr mclusIOn 11> not desIred m the final result 42 Preservation of the sample IS not practIcal, analysIs should begm as soon as pOSSIble Refngeration or Icmg to 4°C, to mimmize mIcrobIOlogIcal decomposItIOn of sohds, IS recommended 5 Interferences 5 1 52 Ftltratlon apparatus, filter matenal, pre-washmg, post-washmg, and drymg temperature are speCIfied because these varIables have been shown to affect the results Samples htgh m Ftlterable ReSIdue (dIssolved sohds), such as sahne waters, brmes and somewastes,maybesubjecttoaposItIvemterference Caremustbetakenmselectmgthe filtenng apparatus so that washmg of the filter and any dIssolved sohds m the filter (7 5) mmimizes thts potential mterference 6 Apparatus 61 Glass fiber filter dISCS, wtthout orgamc bmder, such as MIlhpore AP-40, Reeves Angel 934-AH, Gelman type A/E, or eqUivalent NOTE: Because of the physIcal nature of glass fiber filters, the absolute pore SIze cannot becontrolledormeasured Termssuchas"poresIze",collectIOnefficIenCIesandeffectIve retentIonareusedtodefinethISpropertymglassfiberfilters Valuesfortheseparameters vary for the filters hsted above 62 Ftlter support filtenng apparatus wIth reserVOIr and a coarse (40-60 mIcrons) fntted dISC as a filter support Approved for NPDES Issued 1971 1602-1

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