Usually, synthetic camphor contains more than 95% of camphor as determined by internal standard method.
内标法分析表明，樟脑的含量通常在95%以上。
A method for analysis n-alkanes, steranes and terpanes in oil by internal standard method was established.
采用内标法建立了原油中正构烷烃、生物标志物(甾、萜烷类)的分析方法。
Conclusion: The internal standard method is accurate and reproducible, and suitable for quality control of radix astragali.
结论：建立的内标法准确度高，重复性好，是控制黄芪药材质量的较理想方法。
The internal standard method using a deuterium-labelled analogue as an internal standard makes measurements closer to the true value.
用以氘标记的类似物为内标的内标法可以使测定值更接近真实值。
Besides, quantitation analysis of involatile compositions in beer could be done by internal standard method or by external standard method.
还可用内标法和外标法对啤酒中的不挥发组分进行定量检测分析。
A formula is deduced to calculate the contents (absolute or relative) of some elements in a sample by internal standard method with the aid of relative sensitivity factors.
具体给出了用相对灵敏度因子的内标法确定样品中各元素(绝对或相对)含量的计算公式。
The optimal experimental conditions were obtained by matrix element match, background coefficient and element interference coefficient correction as well as element internal standard method.
本体系采用基体匹配、背景系数和元素干扰系数校正及元素内标法确定了最佳综合实验测试条件。
The optimal experimental conditions were obtained by matrix element match, background coefficient and element interference coefficient correction as well as element internal standard method.
本体系采用基体匹配、背景系数和元素干扰系数校正及元素内标法确定了最佳综合实验测试条件。
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