Assertion: hydrogen sulfide's concentration | /r/AtLocation | system effluents
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text: In fact, the percentage complexed with iron is likely to be much more than 85% since relatively high concentrations of total extractable iron were reported in system effluents, i.e., from about 200 to 1700 µg/L, depending on whether or not wastewater had been treated with ferric chloride (MEQ 2001a,b).