The-COOH contents in HA increases, phenolic-OH group decreases and the chemical acidity of acidic functional groups increases when HA is oxidized by nitric acid.
用硝酸氧化能使ha中羧基含量增加，酚羟基减少，酸性功能团活性提高。
The-COOH contents in HA increases, phenolic-OH group decreases and the chemical acidity of acidic functional groups increases when HA is oxidized by nitric acid.
用硝酸氧化能使ha中羧基含量增加，酚羟基减少，酸性功能团活性提高。
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