Sodium chloride (nacl)

A flat-sheet nonwoven-reinforced polysulfone (PSF) support membrane with average molecular weight cut-off (MWCO) of 80 000 g mol⁻¹ was supplied by Hangzhou Water Treatment Technology Development Center (Hangzhou, China). Piperazine (PIP, 99%), n-hexane (≥97%), trimesoyl chloride (TMC), sodium dodecyl sulfate (SDS, analytically pure), triethanolamine (TEOA, 98%), bovine serum albumin (BSA, analytically pure), sodium alginate (SA, analytically pure), humic acid (HA, analytically pure), 1H,1H,2H,2H-perfluorodecyltrichlorosilane (PFTS, 95%) and polyethylene glycol (PEG) with different molecular weights (M_w = 200, 300, 400, 600, 800 and 1000 Da) were purchased from Macklin (Shanghai, China). Alcohol, sodium sulfate (Na₂SO₄), and sodium chloride (NaCl) were purchased from Shanghai Lingfeng Chemical Reagent Co. Ltd, China. All reagents were used as received without further purification. Pure water used throughout in this work was derived from a Milli-Q system (Millipore, US).

All pesticide standards were purchased from Shanghai Anpu Experimental Technology Co. (Shanghai, China). HPLC grade acetonitrile and methanol were obtained by Merck Co. (Darmstadt, Germany). HPLC grade formic acid was purchased from Anaqua Chemicals Supply (Wilmington, NC, USA). Anhydrous magnesium sulfate (MgSO₄) was obtained from RHAWN (Shanghai, China). MWCNT (O.D. 20–30 nm, L. 0.5–2 μm, O.D. 10–20 nm, L. 0.5–2 μm, O.D. 10–20 nm, L. 10–30 μm) and g-MWCNTs (O.D. 10–20 nm, L. 5–30 μm) were obtained by XFNANO (Nanjing, China). g-MWCNTs (O.D. 30–50 nm, L. 10–20 μm), MWCNTs-COOH (O.D. 30–50 nm, L. 10–20 μm), MWCNTs-OH (O.D. 30–50 nm, L. 10–20 μm), MWCNTs-NH₂ (O.D. 8–15 nm, L. −50 μm), and sorbents ZrO₂ were purchased from Aladdin Industrial Corporation (Shanghai, China). PSA and C18 were obtained by Agilent Technologies (Tianjin, China). 2 mL Agela Cleanert MAS-Q purification tubes (PSA, 50 mg; C18, 50 mg; MgSO₄, 150 mg) were purchased from Bonna-Agela Technologies Co. (Tianjin, China). Sodium chloride (NaCl) and AR-acetonitrile were purchased from Shanghai Lingfeng Chemical Reagent Co. (Shanghai, China).
A separate standard solution for each pesticide was prepared in acetonitrile at a concentration of 1000 mg/L. Then, the mixed standard solutions were prepared in methanol. All standard solutions were stored in a refrigerator at 4 °C for use in subsequent experiments.