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        ¸½²¿·ÖÉó¸åÒâ¼ûÈçÏ£ºThe authors....however, they do not present sufficient evidence that supports the idea that it is acting as a reducing agent -- was Mn(2+) actually determined by titration or other means to confirm its existence?. If Mn(4+) was indeed reduced to Mn(2+), it must be verified, if not, the lignin may be forming a complex that solublizes MnO2.
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