The researchers used water and an ultrasonic extraction process, followed by gaschromatography-mass spectrometry to quantify the amount of cocaine in more than 230 bills collected in 17 cities.
A solvent flotation-gaschromatography for the determination of sodium stearate in sodium aluminate solution in aluminium hydroxide production by the bayer process was studied.
研究了拜尔法生产氢氧化铝过程中，用溶剂浮选-气相色谱法测定结晶助剂有效成分硬脂酸钠的方法。
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The volatile organic compounds (VOCs) produced in the laser-sculpture process of bicolor board were studied using cold trap condensation-gaschromatography-mass spectrometry.