More free sulfhydryls and higher sample concentration mean that one should consider using higher concentrations of reducing agent.

自由巯基数目越多，样品浓度越高，还原剂的用量就越大。

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The sample concentration and the ratio of elution solution which influence the separation effect of PC and PE were further researched.

考察了进样浓度和洗脱液配比对分离效果的影响。

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These pumps are widely used for applications including filtration, sample concentration, solid phase extraction. They are the important basic instruments in the lab.

无油真空泵广泛应用于过滤、样品浓缩、固相萃取等装置中，是实验室重要的基础设备。

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Tests are then done to determine the pH and concentration of the sample to ensure the suitability and integrity of the samples for analysis.

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