Parameters including linearity, LOD, accuracy and precision of the proposed method were validated according to the procedures described above. The standard curve showed good linearity with correlation coefficients of higher than 0.998. The method LODs obtained in the first way were 0.10 and 0.4 mg L1 for water and milk samples, respectively. The corresponding method LOD in the second way was 0.005 mg L1 due to the 20 times concentration.
Recoveries were carried out by spiking blank samples with 10, 50 and 100 mg L1 of melamine in the first way, 0.5, 2.5 and 5.0 mg L1 of standard solution in the second way. As shown in Table 1, good accuracy was obtained with recoveries of higher than 90%. The precision of the proposed method was validated by the relative standard deviations (RSDs) obtained in the intraday and interday analysis of samples spiked at the same levels of melamine as those
in recovery analysis. The intraday precision of the tested samples was in the range of 3.2e4.9%, whereas the interday precision was between 5.0 and 7.2%.
Parameters including linearity, LOD, accuracy and precision of the proposed method were validated according to the procedures described above. The standard curve showed good linearity with correlation coefficients of higher than 0.998. The method LODs obtained in the first way were 0.10 and 0.4 mg L1 for water and milk samples, respectively. The corresponding method LOD in the second way was 0.005 mg L1 due to the 20 times concentration.
Recoveries were carried out by spiking blank samples with 10, 50 and 100 mg L1 of melamine in the first way, 0.5, 2.5 and 5.0 mg L1 of standard solution in the second way. As shown in Table 1, good accuracy was obtained with recoveries of higher than 90%. The precision of the proposed method was validated by the relative standard deviations (RSDs) obtained in the intraday and interday analysis of samples spiked at the same levels of melamine as those
in recovery analysis. The intraday precision of the tested samples was in the range of 3.2e4.9%, whereas the interday precision was between 5.0 and 7.2%.
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