overnight margin是什么意思

用法例句

The paper introduces how to examine aniois content in the boiled water standed for night by ion chromatography with chemical suppression.

介绍了用抑制型离子色谱法测定隔夜沸水中F-,Cl-,NO2-,H2PO4-,NO3-的含量的方法:流动相为4mmol/L Na2CO3与3mmol/L NaHCO3的混合溶液,流动相流速为1。