Daily QC Check for standard solution.

Im preparing 50 ppm standard solution, to do daily cross check for my calibration curves

Using purity of 99% standard analyte
i prepare 5mg/ 0.01L = 50 ppm

However, when i inject, i got only 37 ppm from GC analysis.
is that means my calibration curves s not okay? or might be the sample preparation error?

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