Dichloromethane

Sudan I, Sudan II, Sudan III, Sudan IV, Sudan red 7B, Sudan red G, Sudan red B, and Para red were obtained from Dr. Ehrenstorfer GmbH (Augsburg, Germany). Water was prepared by a Milli-Q ultrapure water system (Millipore, Bedford, MA.). HPLC-grade acetonitrile, methanol, dichloromethane, and isopropanol were purchased from Dikma (Lake Forest, CA). Formic acid was obtained from Acros Organics (Morris Plains, NJ).

Reverse osmosis concentrate was taken from a municipal wastewater treatment plant in which biologically treated secondary effluent was subjected to MBR+RO system to remove organics and salts for water reclamation. The characteristics of the ROC are shown in Table 4.
Activated carbon was purchased from SIGMA-ALDRICH Company with a particle size of 20–40 meshes. Tert-Butanol (TBA), p-CBA, tetracycline, metoprolol, atrazine, methanol, dichloromethane, hexane and ammonium acetate were purchased from DIKMA (Beijing, China) with the grade of chromatographic pure. The other reagents used in experimental are analytical pure. Ultrapure water was produced by Thermo SMART 2 PURE ultrapure water meter (μ = 18.2 MΩ × cm, Waltham, MA, USA).