Recovery rate and precision of the determination method of 6 polyether antibiotic residues in milk and milk powder

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9 Method recovery and precision

Using the standard addition method, four concentration levels of polyether standard solutions were added to the blank sample, and each addition level was tested 5 times in parallel.
The determination results are shown in Table 20-7
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Table 20-7 The recovery rate and precision experiment results of six polyether substances in milk and milk powder (n=5)

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10 Repeatability and reproducibility

Under repeatability test conditions, the absolute difference between the two independent test results obtained does not exceed the repeatability limit (r).
If the difference exceeds the repeatability limit (r), the test results should be discarded and the two individual tests should be completed again.
Determination
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Table 20-8 The concentration of six polyether antibiotics and the reproducibility limit and reproducibility limit equation

Related links: Linear range and lower limit of determination of 6 polyether antibiotic residues in milk and milk powder