Hydroxylamine hydrochloride

4-Cyanobenzaldehyde, benzil, 4-bromobenzoic acid, bis(pinacolato)diboron, 1,1′-carbonyldiimidazole (CDI), [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II)dichloride (PdCl₂ (dppf)), H₂O₂, potassium super-oxide (KO₂), t-butyl hydroperoxide (TBHP), m-chloroperoxybenzoic acid (mCPBA), hypochlorous acid (HOCl), HEPES buffer solution, Whatman papers, Dulbecco's phosphate-buffered saline (DBS), Roswell Park Memorial Institute (RPMI) medium, fetal bovine serum (FBS), penicillin, streptomycin, and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) were purchased from Sigma-Aldrich (St. Louis, MO, USA). Ammonium acetate, acetic acid, ethanol, hydroxylamine hydrochloride, sodium hydroxide, ethyl acetate, hexane, sodium bicarbonate, dimethylformamide (DMF), dimethyl sulfoxide (DMSO), 1,4-dioxane, and potassium acetate were purchased from Daejung Chemicals (Siheungsi, Kyunggido, Republic of Korea). Sodium nitrate (NaNO₃⁻), potassium perchlorate (KClO₄⁻), sodium sulfate (Na₂SO₄), sodium nitrite (NaNO₂), and benzoyl peroxide (BPO) were obtained from AccuStandard (New Haven, CT, USA). The MCF-7 cells were purchased from the Korean Cell Line Bank (Seoul, Republic of Korea). All reagents were used as received without further purification.

The WFD samples used in this study were obtained from a foundry in Incheon, South Korea. CR (C₃₂H₂₂N₆Na₂O₆S₂) was purchased from Samchun Chemicals. Hydrogen peroxide (H₂O₂, 30%), hydrochloric acid (35%), sodium hydroxide (98%), sodium chloride (NaCl), sodium carbonate (Na₂CO₃), sodium sulfate (Na₂SO₄), and sodium acetate were purchased from Duksan Pure Chemicals. 1,10-Phenantroline and hydroxylamine hydrochloride were obtained from Daejung Chemicals. Disodium telephthalate (TA, > 99%) was purchased from Alfa Aesar (USA). 2-Hydroxyterephthalate (TPOH 97%) was purchased from Sigma–Aldrich. The deionized water used in this experiment was purified using an EXL5 system (Vivagen Co. Ltd., Korea).