Impact of Bacillus species on Fe reduction of kaolin in …
composition of the kaolin sample is shown in Table 1. The pH of the kaolin was 4.0–5.5, with a brightness of 76–80% and average particles size of 2.5–3.5 µM. The kaolin cake was rolled into ne powder and mixed until homogenized. The kaolin powder was kept and stored in dry place. Preparation of bacterial culture
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