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It seems that the free ash acted as a buffer towards hydrogen ions; as a consequence, the free ash removal led to a lower pH value, which in turn enhanced the formation of weak acids during the LHW pretreatment and further reduced pH value (Villen-Guzman et al. rtp hoki emas hari ini , 2015) Download : Download high-res image (320KB) Download : Download full-size image
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