海水化学需氧量的快速测定王金丽孙永利尚巍穆莹周蕾高晨晨

30007420000mg/L3．5gAgNO3/gCl－2mL0．2gHACHCOD15min。、0．5hCOD15～150mg/L。CODX834C1000－4602201402－0095－03ＲapidDeterminationofChemicalOxygenDemandinSeawaterWANGJin-liSUNYong-liSHANGWeiMUYingZHOULeiGAOChen-chenNorthChinaMunicipalEngineeringDesignandＲesearchInstituteTianjin300074ChinaAbstractAmethodforrapiddeterminationofchemicaloxygendemandinseawaterwasestab-lished．Topartlyremove20000mg/Lchlorideioninseawaterbyprecipitationmethodusingsilverni-tratetheoptimaldosageofsilvernitratewas3．5gAgNO3/gCl－．Aftercentrifugation0．2gmercurysulfatewasaddedinto2mLsupernatanttomasktheinterferenceofresidualchlorideion．Thesamplewasdigestedfor15minbyHACHdigestionreagentforCODandthechemicaloxygendemandinseawaterwasdeterminedbyspectrophotometry．Thewholeprocesswaseasyandfastwhichcouldbefinishedwithinhalfanhourwithgoodaccuracyandreproducibility．ThemethodwasapplicabletodeterminethechemicaloxygendemandinseawaterwiththeCODconcentrationrangefrom15mg/Lto150mg/L．KeywordschemicaloxygendemandinseawatersilvernitratechlorideionfastdigestionofCOD2012ZX07308－001123。《》GB11914—891000mg/L4。＜150mg/L20000mg/L1000mg/L。HJT70—2001、。、、。·59·30220141CHINAWATEＲ＆WASTEWATEＲVol．30No．2Jan．201411.1HACHDＲ6000HACHDＲB200AnkeTDL－80－2CTE124S。1.2HACHCOD。1.3。1.4①。②COD15、30、60、90、150mg/L。③COD30mg/L10mL0．5、0．7、0．9g4000r/min3min2mL0．2g3minHACH15min。10mLCOD。DＲ6000CODCOD3。。④③4COD3。⑤33。22.1TDS30g/L。3、2．5km、10km19．2～19．9g/L20g/L20g/LCOD。2.2AgNO3。。。。0．2g。10mL20000mg/L5．6mmolAgNO32．9、4．1、5．3mmol。1。1AgNO3CODTab．1DeterminationresultsofCODunderdifferentdosageofAgNO3/gCOD/mg·L－1COD/mg·L－1/%/%/%0．5303516．7116．734．314．3114．335．418118．01．60．73028．8－496．028．5－595．029．2－2．797．31．20．93020．9－30．369．721．4－28．771．321．9－2773．02．30．5g0．2gCOD14．3%～18%114．3%～118%。0．7g0．9gCOD0．2g0．9g0．7g－30．3%～－27%－5%～－2．7%95%70%0．9g0．2g。0．7g95%～97．3%90%～110%·69·302．watergasheat．com。1．6%、1．2%2．3%5%0．7g。、0．7g3．5gAgNO3/gCl－。2.320000mg/LCOD15、60、90、150mg/L4、、、3．5gAgNO3/gCl－。2－7．3%～－2．1%92．7%～97．9%0．6%～1．2%20000mg/L、COD15～150mg/L。2CODTab．2DeterminationresultsofCODinknownconcentrationsolutionCOD/mg·L－1COD/mg·L－1/%/%/%1513．9－7．392．714．2－5．394．714．0－6．793．31．16056．8－5．394．757．4－4．395．758．2－3．097．01．29087．6－2．797．385．9－4．695．486．5－3．996．11．0150145．4－3．196．9146．8－2．197．9145．2－3．296．80．62.4－－－33。3Tab．3DeterminationresultsofCODinseawaterCOD/mg·L－1COD/mg·L－1/%26．528．028．827．84．22．5km22．220．721．521．53．510km14．913．614．014．24．7320～30mg/L15mg/L。5%、COD。320000mg/L3．5gAgNO3/gCl－2mL0．2gHACHCOD15minCOD。0．5hCOD、、COD15～150mg/L。1．CODJ．200322356－58．2．CODJ．200820589－90．3．D．2005．4．4M．2002．1983－。[e-mail]2013－09－22·79·．watergasheat．com302