You take the y component, take the derivative with respect to x, take the x component, differentiate with respect to y, you should get the same answer. And that is important to know.
对y分量，关于x求导，对x分量，关于y求导，应该得到相同结果，这个知识点很重要。
A new method for determining directly trace component in interfering base by absorbance subtraction -second derivative spectrophotometry is proposed.
对利用差谱—二阶导数分光光度法直接测定强干扰基体中微量组分的原理和实验方法进行了探讨。
The derivative ratio spectra is found by derivation of the ratio of the spectra of compounds in a mixture to the spectra of the interfering component against the wavelength.
利用混合物的波谱除以干扰组分的波谱得比值波谱，对波长求导得比值导数波谱，由此可消除干扰组分的吸光度叠加效应。
The derivative ratio spectra is found by derivation of the ratio of the spectra of compounds in a mixture to the spectra of the interfering component against the wavelength.
利用混合物的波谱除以干扰组分的波谱得比值波谱，对波长求导得比值导数波谱，由此可消除干扰组分的吸光度叠加效应。
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