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This is an essay in the field of mining engineering. Recently, the application research of surfactants such as frother agents has become significantly important in mineral flotation, because it provides huge information on the characteristics of the gas-liquid interface before the bubble-particle collision or attachment. Moreover, it proposes important theories for the optimization of the flotation process. This article focuses on the potential measurement, tension test, and adsorption characteristics of the gas-liquid interface. The profile analysis tensiometry (PAT) test method for the adsorption characteristics of the gas-liquid interface is also introduced. Meanwhile, the research work on the characteristics of the gas-liquid interface has prospected.