Weighing filtration membrane is often used to get the dust concentration of environment.However,this method is discommodious and can not get the instantaneous transformation of dust concentration.

环境粉尘浓的测定一般使滤膜称重方法测得,该方法费时费,能得到瞬时粉尘浓的变化。

The relation ship between the salivary and the blood Diphenylhydantoin (DPH) Levels in the epileptic (EP) patients with oral dosing DPH were studied.

目的研究服英钠（DPH），癫痫（EP）患者唾液与血清中DPH浓关系，探讨测定唾液中DPH浓替代血药浓的可行性。

A method for the determination of trace cations in the tetramethylammonium chloride was developed by ion chromatography(IC) with conductivity detector.

文章采离子色谱法测定高浓四甲基氯化铵中钠、钾和钙金属离子。