The external standard method was adopted for the assay of 5 - HMF.

以外标法测定5-HMF的含量.

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Triethyl orthoacetate in reaction and determined by gas chromatography with external standard method.

应用气相色谱法测定制备原乙酸三乙酯反应产物中产品质量.

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The extracted solution was analyzed by using GC - FPD and quantified by external standard method.

以GC-FPD 测定,外标法定量,必要时结果用不同极性的毛细管柱验证分析结果.

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Analytes in eluant were determined using GC equipped with FPD and external standard method.

以GC-FPD测定,外标法定量,测定结果用不同极性的毛细管柱验证.

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