【判断题】
色谱分析中,通常当a大于1.2时,即可在填充柱上获得满意的分离。
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原油经加热脱水后,需放置不少于48小时才能测定凝点。
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原油凝点高于40℃时,预热温度可高于预计凝点10℃的条件下预热。
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测定原油凝点时,浴温要控制在低于预计凝点10℃的条件下进行。
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当金属插入其盐溶液时,金属表面和溶液界间形成了扩散双电层,所以产生了电位差,这个电位差叫做电极电位。
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被分离组分与固定相分子的性质越相似,它们之间的作用力越小,其保留值也越小。
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色谱柱的分离效果用a表示,a越大则在色谱图上两个峰的距离越远,表明这两个组分越易分离。
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碳原子数相同时,正构烷烃的粘温性能比芳烃、环烷烃等烃都好,但正构烷烃不是润滑油的理想组分。
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柱效率用理论塔板数n或理论塔板高度H表示,柱效越高,即n越大,H越小。
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氢火焰离子化检验器的响应温度、载气和流速无关,这就是它有可能成为定量分析中最好的检测器的原因。
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马达法和研究法辛烷值在测定条件上的区别在于混合气温度和发动机转速不同。
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在色谱分析中,当纯载气进入检测时,记录笔所画出的线,称为基线。
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在色谱分析中,从进样开始到空气峰出现的时间叫保留时间。
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测定液化石油气的铜片腐蚀时,必须先以蒸馏水将试验筒的内壁润湿。
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分光光度法是建立在物质吸收光量多少,可以反映物质含量大小上的。
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在液化石油气中有时要加入具有臭味的硫醇、硫醚等含硫化合物,是为了确保液化石油气的使用安全性。
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is viewed as Romantic poetry’s “Declaration of Independence.”
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