Concentration added (mcg/ml) Calculated concentration (mcg/ml) Standard deviation %  Coefficient of variation Relative error %
Intra-day Inter-day Intra-day Inter-day Intra-day Inter-day Intra-day Inter-day
0.1 0.096 0.104 0.013 0.015 13.541 14.42 -4.000 4
0.5 0.531 0.522 0.011 0.024 2.071 4.597 6.2 4.4
1 1.015 1.015 0.062 0.044 6.104 4.334 1.5 1.5
2.5 2.499 2.536 0.014 0.116 0.56 4.574 -0.04 1.4
5 4.994 5.165 0.302 0.259 6.047 5.014 -0.12 3.3

Table 1: Intra-day and inter-day accuracy and precision data.

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