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CHEMICAL OXYGEN DEMAND Method 410.4 (Colorimetric, Automated; Manual) STORET NO. 00340 1 Scope and ApphcatIOn 1 1 ThIS method covers the determmatIOn of COD m surface waters, domestic and mdustnal wastes 1 2 The apphcable range of the automated method IS 3-900 mg/1 and the range of the manual method IS 20 to 900 mg/l 2 Summary of Method 2 1 Sample, blanks and standards m sealed tubes are heated m an oven or block dlgestor m the presence of dIchromate at 150°C Aftel two hours, the tubes are removed from the oven or dlgestor, cooled and measured spectrophotometncally at 600 nm 3 Sample Handhng and PreservatIOn 3 1 Collect the samples m glass bottles If possIble Use of plastIc contamers IS permIssIble If It IS known that no orgamc contammants are present m the contamers 3 2 Samples should be preserved With sulfunc aCId to a pH < 2 and mamtamed at 4°C untl1 analysIs 4 Interferences 4 1 Chlondes are quantitatively oXIdized by dIchromate and repres~nt a posItive mterference MercuncsulfateISaddedtothedIgestIOntubestocomplexthechlondes 5 Apparatus 51 Drymg oven or block dlgestor, 150°C 52 Cormng culture tubes, 16 x 100 mm or 25 x 150 mm wIth Teflon hned screw cap 53 Spectrophotometer or Techmcon AutoAnalyzer 54 Muffle furnace, 500°C 6 Reagents 61 DIgestIOn solutIOn Add 10 2 g K2Cr207, 167 ml conc H2S04 and 33 3 g HgS04 to 500 ml ofdlstl1led water, cool and dIlute to 1hter 62 Catalyst solutIOn Add 22 g Ag2S04 to a 409kg bottle of conc H2S04 Stir unttl d1ssolved 63 Sampler wash solutIOn Add 500 ml ofconc H2S04 to 500 ml ofdlstl1led water 64 Stock potassiUm aCId phthalate Dissolve 0 850 g m 800 ml of dlsttlled water and dtlute to 1hter 1ml = 1mg COD 6 4 1 Prepare a senes of standard solutIOns that cover the expected sample concentratIOns by dllutmg appropnate volumes of the stock standard 7 Procedure 7 1 Wash all cultuie tubes and screw caps wIth 20% H2S04 before their first use to prevent contammatIOn Trace contammatIOn may be removed from the tubes by igmtmg them m amuffleovenat500°Cfor 1hour Pendmg approval for Section 304(h), CWA Issued 1978 4104-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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