Answer Posted / gangadhar

Method-l:
RF of impurity=peak area of impurity/Conc.of impurity.
RF of analyte=peak area of analyte/Conc.of analyte.
RRF of impurity=RF of impurity/RF of analyte.

Method-ll:By linearity method.
RRF of impurity: slope of impurity/slope of analyte.
RRF correction:%impurity/RRF.

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