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.
炭纤维表面润湿性与某些酸性官能团的适量增加，有益于载体表面微生物的固着。
An increase in the number of some acid functional groups and surface wetting quality was helpful to microorganism fixing.
针对东烧以利用自产浮选精矿为主，进行生产酸性小球团热烧结矿的改造，进行了小球团烧结工艺的制粒研究。
Point at the Dong Anshan sinter plant will modifying sintering production to acid MPS hot sinter with self- mined flotation concentrates, the granulating research of MPS process was conducted.
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