*2.6. Linear Range*

Linear regression was performed between 0.0014 to 1.4 mg·L−<sup>1</sup> for SYP-9625. The derived calibration curve formula was y = 241643x + 4475.8 (R<sup>2</sup> = 0.9987). The limit of detection (LOD) of the compounds was calculated on a signal-to-noise (S/N) ratio of 3 concerning the background noise obtained from the blank sample, whereas the limit of quantitation (LOQ) was via an S/N ratio of 10. The LOD of SYP-9625 was 0.010 ug·L−<sup>1</sup> and LOQ was 0.030 ug·L−1.

#### *2.7. Extraction and Recovery of SYP-9625*

Pesticide extraction methods for similar matrices have been reported in the literature, and the methods are briefly described as follows [23]: According to the size of di fferent parts of the clothes, the protective suits were ultrasonically extracted with di fferent volumes of acetone for 20 min at 25 ◦C. The operation was repeated once for better recovery. The volume of the extraction solvent was su fficient to immerse the clothing and was recorded in detail. The extract was then concentrated on a rotary evaporator and dissolved in 2 mL EtOAc(Ethyl acetate). The XAD-2 sample was extracted twice with 5 mL of acetone, then concentrated with a nitrogen evaporator and dissolved in 1 mL of acetonitrile. For 0.01% Aerosol OT, 10 mL of acetonitrile was added to a 10 mL sample and shaken vigorously, then NaCl was added to the mixture, shaken, and centrifuged at 3600 <sup>r</sup>·min−<sup>1</sup> for 5 min to separate the organic solvent from the water. Finally, 1 mL of the resulting supernatant was directly injected into UPLC-MS with an injection volume of 10 uL.
