CV (%) at MRL/RC (3 replicates) and r2 of the linearity plot evaluated in the experiment with formic acid.

Supplementary Table 1: CV (%) at MRL/RC (3 replicates) and r2 of the linearity plot evaluated in the experiment with formic acid.

Compound	CV (%) at MRL/RC (n = 3)	Linearity r²
4MAA	63	0.6
TLF	46	0.4
DCL	51	0.5
CPF	45	0.7
PBZ	68	0.5
FLU-OH	47	0.6
MLX	47	0.7
IBU	49	0.5

Supplementary Table 1 demonstrates coefficients of variation (CV, %) at the (maximum residue limit) MRL/RC (3 replicates), and r² of the linearity plot (three levels (0.5, 1, 2 MRL/RC) and blank, 3 replicates for each point) of the studied NSAIDs, evaluated in the experiment with formic acid.

Non-steroidal anti-inflammatory drugs (NSAIDs): Carprofen (CPF), Tolfenamic acid (TLF), 5-hydroxy flunixin (FLU-OH), Diclofenac (DCL), 4-methylaminoantipyrin (4MAA), Meloxicam (MLX), Ibuprofen (IBU), Phenylbutazone (PBZ).