AOAC SPIFAN Nutrients ERP Reviewer Forms (December 7, 2022)

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or about 100 mL of sample solutions. The density of the 1 M sodium citrate (according to some vendor’s specs) is about 1.1-1.2 g/mL. So, difference (or bias) between the volume-based concentration and the mass-based concentration, if no correction is made, could be as high as 10%. This can introduce a systematic error of up to 10% in the final results. This error would not affect the analytical performance evaluation in the linearity, repeatability/precision, recovery (from spiking), robustness, etc., but could affect the accuracy (compared to a true value). Final Recommendation: After the issue regarding the calculation formula is correctly addressed, it can be recommended to be the First Action method.

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