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• Lead from painted wood and arsenic from pres- <br />sure treated lumber scrap were assumed to be im- <br />mobile. However, recent research indicates new <br />relevant mechanism for their mobilization <br />— Newman DK, Kennedy EK, Coates JD, Ah- <br />mann D, Ellis DJ, Lovley DR, Morel FMM, <br />Dissimilatory arsenate and sulfate reduction in <br />Desulfotomaculum auripigmentum sp. nov., <br />ARCHIVES OF MICROBIOLOGY, 168(5), <br />380 -3881 1997. <br />— Newman DK, Ahmann D, Morel FMM, A brief <br />review of microbial arsenate respiration, GE- <br />OMICROBIOLOGY JOURNAL, 15(4), 255- <br />268, 1998. <br />— Ahmann D, Krumholz LR, Hemond HF, Lov- <br />ley DR, Morel FMM, Microbial mobilization of <br />arsenic from sediments of the Aberjona Water- <br />shed, ENVIRONMENTAL SCIENCE & TECH- <br />NOLOGY, 31(10), 2923 -29307 1997. ABSTRACT: <br />Arsenic mobilization from aquatic <br />sediments is an issue of concern, as <br />water -borne arsenic can migrate into <br />pristine areas, endangering aquatic <br />organisms and people. Such mobilization <br />in the Aberjona Watershed has distribute( <br />nearly 20 t of arsenic throughout river, <br />10 <br />