A problem related to nitrification is a drop in ph for the system due to the formation of nitric acid . 和硝化作用有关的一个问题就是由于生成硝酸而使系统内的PH值降低。
Another proteolytic enzyme, trypsin, is quite inactive at that ph but functions effectively at a ph of 8 . 另一种蛋白质水解酶--胰蛋白酶在此PH时活性甚低而在PH8时效率最高。
at ph values above 12, ferric hydroxide will resolubilize due to the formation of the fe鳎anion. 当pH值高于12时，由于形成Fe阴离子，氢氧化铁会再次溶解。
Burial diagenesis causes a progressive transformation of smectites, the end-products being dependent on ph and pore water chemistry . 埋藏成岩作用可使蒙脱石进一步转化，最终产物决定于PH值及孔隙水的化学性质。
The initial ph of solutions of poorly ionized acids depends largely upon the degree of ionization and the titration curves very markedly . 其电离酸溶液开始的pH值在很大程度上取决于电离度，其滴定曲线也非常清晰。
Aqueous machining fluids . determination of the ph value 含水机加液. ph值的测定
A section of a longer ms or ph . d proposal 较长的硕士或博士论文提案的部分内容。
The inflection point at this ph is barely detectable 在此ph值下，拐点不易发现。
Reference material - ph standard solution - oxalate 参考物质. ph标准溶液.草酸盐
