当溶液pH值在5左右时，吸附效果最好的翻译：When the solution pH value at the time of around 5, adsorption work best 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

When the solution ph value in the 5 or so, the best adsorption

When the solution pH value at the time of around 5, adsorption work best

When solution pH value when 5, the adsorption effect is best

When solution pH value when he was about 5 at best adsorption

When the solution pH value at the time of around 5, adsorption work best