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Dechlorination by Silver Lake microorganisms. The initialdechlorination rate of Aroclor 1242 by SL microorganismswas similar to that by the HR microorganisms (Table 2), butlittle dechlorination occurred after the first 4 weeks (Fig. 6).Therefore, dechlorination was less extensive than with HRmicroorganisms, as only 46% of the meta plus para chlorineswere removed even after 16 weeks.In dechlorinating Aroclor 1242, the SL microorganismsleft several congeners besides the congeners substituted atonly ortho positions, which were characteristic of dechlorination by the HR microorganisms. The most prominent ofthese were 2-4-CB/2,3-CB (peak 6), 2,4-2-CB (peak 10), and2,4-4-CB/2,4,6-2-CB (peak 18) (Fig. 7). At the 8-week timepoint there was also a substantial amount of 2,4-2,4-CB
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