1、Add 25 ppb Bentonite and allow to hydrate for a minimum of 6 hrs
按每桶鉆井液加25磅的膨潤土，允許水化至少6個小時。

2、DETERMINATION OF ppb LEVEL Ag,Cd,Pb,Au,Bi AND Cu BY FLOTATION-FAAS
浮選-原子吸收法連續(xù)測定ppb級銀、鉛、鎘、金、鉍、銅

3、All drill water to be pretreated with 2 ppb Gluteraldehyde.
所有的鉆井水都要按每桶加兩磅的戊二醛作預處理。

4、Add 25 ppb Bentonite and allow to hydrate for a minimum of 6 hrs.
按每桶鉆井液加25磅的膨潤土，允許水化至少6個小時。

ppb翻譯