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The aim of this study was to determine the potential of sulfate reducing bacteria (SRB) as reducing agents for decrease Fe and Mn in acid soils of coal mines using five isolates of isolated SRB from post-coal mining sediments in Samarinda. The SRB potential test in reducing Fe and Mn was carried out by growing SRB on liquid Postgate media with varying pH of 3, 4 and 5 with the addition of mine acid soil to each treatment. Each of the pure SRB isolates (1 ml) was inoculated into liquid Postgatedoi:10.1088/1742-6596/1277/1/012009 fatcat:4dom6rv52zc5tmkk4jgnqsqnvy