tailieunhanh - Manual for Soil Analysis-Monitoring and Assessing Soil Bioremediation Phần 5

136 A. Singh et al. Soil Microcosms One of the simplest methods requiring minimal equipment for soil biodegradation studies is with use of a biometer flask (Bellco, Vineland, NJ, USA). The United Sates Environmental Protection Agency (US EPA) and Organization of Economic Cooperation and Development (OCED) have also recommended this method (OECD 1981; McFarland et al. 1991; Skladany and Baker 1994). Biodegradation activity can be evaluated by directly monitoring the loss of the target compounds or indirectly by measuring by-products of biodegradation or electron acceptor consumption. A biometer flask, a 250-mL Erlenmeyer flask with a side arm containing potassium hydroxide to trap. | 136 A. Singh etal. Soil Microcosms One ofthe simplest methods requiringmialmalequipmentforaoil biode-gradalionstudiesis withuse rf aisiome-es desk Beilco Vinslana NJ USA . The Unrtrd tsSrs Eevieonnsbotalkasiectionngoacy ran EOA andOsaani-zation of daonomlc doonerolion endDevalopmeot OCEOf hove ahso reCi ommendadthssmrthod OdCOi 1081 McFarlandetal. 1991 Skladeny anV Baker can beeva-raioO iy kirectCymonitor-ingths iosrrflhe -nrret compnoods or icdlrectiybymeecuaingay-vtebuois of biodnesoCrtion er eivctrrn acceveor ros umvtic d. A biome-eo desk a2nO-mLErlenmekvr flask wíth a ssOe atm ceEtaiE-ing potassidmhydrooide to Skìs- COt evolved dorms biodeesoCrtion is used iabatcv ees i rnT os bs tomomtor VegsaCationof the isost ebosEoodd present ĩnor sided toflae eontamlvaiqdaosi. FosbiodegseCationOeasibii-ities stokies aronny oaVo w v aqueous sofltuspenaionít revomk - da . Flasksaseinoubatna wstk os withoqtO-o2sfreo uir andpoaicdirallyKOH solutinn is witkdsawnant toasted wssk a cSrndesyacid soIuSíoo ioste-termÍEe de amouy of V O2pvc ducrd. Themarsidcanbnavelkzedacthe end osthe tnstrorornenlcoydmorcavlcos mnondds. Thabiome-es dasks can bnmodifieo tomvestivate coocificproblems rslatebto rceclfictnpes of contnmlvantsandcyallenoesiv studyinaa gi-toe flask systnm can dee-ted tc stcEdbiodcgsnCationoSOatd semi-nalaiilecnd volatile comknddds avC toacrsencommescialinoouivtenas weA. An 1 secpiromeies desígned tomeESureinaoxygen uosaka or rate ob sasnirikiocby miecoden in rniiandsiudge hatbren ussm bytCe US EPA for yvalbatlon ef eammescialpni ducrs Can use in .since rs ío m Sound AlvskdCVenosa etal. tE92 .kke renriromeirs aansisns ofatenctor modulecankectvdto as eleotraCrnsr Obygeo dnrietiao ef exygenbosviecedencseaten avaeuum b aorõ i esr tOs nxogeo gonvrotov. The elnrrricity unsd toaanerotetho s geo icpveperrtonai so tke oi c u ef exygeo msaE while theCO2pvoduriol by miecodial nc-iviiy ss trcpnsb in KO solution. The

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