Fig. 4. Biotic mineralization of aqueous TNT (0.22 mM) with two different biomasses, 467 mg waste-activated sludge (WAS) L^-1 (•) and 333 mg 2,4-dinitrophenol (DNP) L^-1 (). Error bars on symbols indicate standard error of means (n = 3, P 0.05); where absent, bars fall within symbols.