Sodium dihydrogen phosphate monohydrate (≥99%), dimethyl sulfoxide (DMSO, ≥99.9%), hydrochloric acid (1 N Titrisol TM ), and sodium hydroxide (0.5 N Titrisol TM )
were from Merck (Darmstadt, Germany). Methanol (HPLC grade) was obtained from Thermo Fisher Scientific (Waltham, MA, USA). Sodium dodecyl sulfate (SDS, ≥99%), 1-butanol (≥99.7%), heptane (99%), sodium phosphate dodecahydrate (>98%), and dodecanophenone (98%) were from Sigma-Aldrich (St. Louis, MO, USA). Disodium hydrogen phosphate (99.5%) and sodium acetate anhydrous (99.6%) were from Baker (Center Valley, PA, USA). Water was purified using a Milli-Q plus system from Millipore (Bedford, MA, USA), with a resistivity of 18.2 MΩ cm.
The test compounds were ibuprofen (≥98%), 2,4,6-trichlorophenol (98%), ketoprofen (≥98%), and naproxen (≥98%) from Sigma-Aldrich; benzoic acid (99.99%) from Baker; and 3-bromobenzoic acid (98%) from Merck.
were from Merck (Darmstadt, Germany). Methanol (HPLC grade) was obtained from Thermo Fisher Scientific (Waltham, MA, USA). Sodium dodecyl sulfate (SDS, ≥99%), 1-butanol (≥99.7%), heptane (99%), sodium phosphate dodecahydrate (>98%), and dodecanophenone (98%) were from Sigma-Aldrich (St. Louis, MO, USA). Disodium hydrogen phosphate (99.5%) and sodium acetate anhydrous (99.6%) were from Baker (Center Valley, PA, USA). Water was purified using a Milli-Q plus system from Millipore (Bedford, MA, USA), with a resistivity of 18.2 MΩ cm.
The test compounds were ibuprofen (≥98%), 2,4,6-trichlorophenol (98%), ketoprofen (≥98%), and naproxen (≥98%) from Sigma-Aldrich; benzoic acid (99.99%) from Baker; and 3-bromobenzoic acid (98%) from Merck.