EFFECTS AND RISK ASSESSMENT OF LINEAR ALKYLBENZENE SULFONATES IN AGRICULTURAL SOIL. 2. EFFECTS ON SOIL MICROBIOLOGY AS INFLUENCED BY SEWAGE SLUDGE AND INCUBATION TIME

摘要

The anionic surfactant linear alkylbenzene sulfonate(LAS)may inhibit soil microorganisms and may occur in agricultural soil through the application of sewage sludge. For five microbial parameters(microbial biomass C and the potentials of iron reduction, ammonium oxidation, dehydrogenase activity, and arysulfatase activity), we compared the effects of aqueous LAS and LAS-spiked sewage sludge added to existing levels of 0, 3, 8, 22, 62, 174 and 488 mg/kg soil(dry wt)in a Danish sandy agricultural Soil that was incubated for 5 d to eight weeks.