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7 Calculate
Make a working curve according to the peak area and concentration of the standard working solution, calculate the residual amount of quinocetone in the sample extract from the working curve according to the peak area of the sample extract, and calculate the residual amount of quinocetone in the sample according to formula (1.
where:
X—the residual amount of quinocetone in the sample, in micrograms per kilogram (μg/kg);
QuinocetoneC—the residual amount of quinocetone in the sample extract, in micrograms per milliliter (μg/mL);
V—final constant volume, in milliliters (mL);
m—sample mass, in grams (g.
The result retains 3 significant digit.
8 Method Sensitivity, Accuracy, Precision
1 Sensitivity
The detection limit of this method is 20 (μg/kg, and the limit of quantification is 50 μg/k.
2 Accuracy
When the standard addition concentration is 50 μg/kg～200 μg/kg, the recovery rate of quinocetone is 70%～120.
3 Precision
The relative standard deviation within the batch of this method is less than or equal to 10%, and the relative standard deviation between batches is less than or equal to 15.
