Table 3: System precision data of standard solution (c=50 μg/mL).

Standards Repeatability Intermediate precision
mean area RSD% mean area RSD%
3,4-DHBA 3199.87 2.638 3297.87 4.921
2,5-DHBA 1438.88 2.196 1476.25 4.176
2,3-DHBA 1431.08 4.782 1468.65 5.322
2,4-DHBA 2664.00 1.289 2696.24 4.448
SA 1194.34 3.095 1242.43 6.277

RSD%: relative standard deviation (%)
DHBA: dihydroxybenzoic acid; SA: salicylic acid

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