Octadecyltrimethylammonium odtma bromide

All chemicals were of analytical grade. The clay used was Wyoming Na-montmorillonite SWY-2 clay obtained from the Source Clays Registry (Clay Mineral Society, Colombia, MO, USA). Quartz sand (grain size 0.8-1.2 mm) was obtained from Negev Industrial Minerals (Israel). Octadecyltrimethylammonium (ODTMA) bromide was obtained from Sigma Aldrich. Pure SP was obtained from Birzeit Pharmaceutical Company (Palestine) with 99% purity, and used as received. Fine powder activated charcoal (FAC) with particle size 60 mm, and granular activated charcoal (GAC) with particle size 700 mm were obtained from Sigma (Sigma Chemical Company, St. Louis, MO, USA). The powder was used for batch adsorption experiments while the granules were used in column experiments. Magnesium sulfate anhydrous, potassium dihydrogen phosphate as well as methanol and water for analysis (HPLC grade) were purchased from Sigma Aldrich (Munich, Germany). High purity diethyl ether (> 99%) was purchased from Biolab (Israel). For sample enrichment and purification solid phase extraction (SPE) 1 g C-18 6-mL disposable cartridges (Waters, Milford, MA, USA) were used.

All chemicals were of analytical grade. The clay used was Wyoming Na-montmorillonite SWY-2 obtained from the Source Clays Registry (Clay Mineral Society, Colombia, MO). Quartz sand (grain size 0.8-1.2 mm) was obtained from Negev industrial minerals (Israel). Octadecyltrimethylammonium (ODTMA) bromide was obtained from Sigma Aldrich. Paracetamol was obtained from Birzeit pharmaceutical company (Ramallah-Palestine). Activated Charcoal (12-20 mesh) was obtained from Sigma (Sigma Chemical Company, USA). De-ionized water was used to prepare all solutions. Methanol, acetonitrile, tetrahydrofuran, and water were both HPLC grade and purchased from Sigma Aldrich. Magnesium sulfate, hydrogen peroxide, and p-aminophenol were purchased from Sigma Aldrich. High purity diethyl ether (>99%) was purchased from Biolab (Israel); orthophosphoric acid was obtained from Riedel-De Haën (Germany). Microbiological growth media (MacConkey agar, Blood Agar, Eosin Methylene Blue (EMB) Agar, and Mannitol Salt Agar (MSA)) were obtained from Sigma-Aldrich company; API-20E test Kit was obtained from Biomerieux.