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The development of a new electrochemical sensor for determination of trace molybdenum, based on cupferron‐tetraphenylborate ion‐pair drop coated modified screen‐printed carbon electrode (Cup‐SPCE) is described. The printing inks, printing device, substrate and all used materials for making the sensor were prepared as homemade. Under the optimum conditions, the analytical calibration curve was found bimodal with linear concentration ranges from 5 to 200 ng mL−1 and from 200 to 2000 ng mL−1. The detection limit of the method in the concentration of 5–200 ng mL−1 was found to be 2.5 ng mL−1. The method was successfully applied for the determination of Mo(VI) in drinking water samples.

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The solubilities of the drugs benzocaine, metronidazole benzoate, and naproxen in supercritical carbon dioxide were measured at pressures ranging from (122 to 355) bar and temperatures ranging from (308 to 348) K. These drugs have mole fraction solubilies between 1.0 × 10-5 and 1.2 × 10-2, which are high enough to make the supercritical impregnation process a feasible alternative to impregnation employing organic solvents. Crossover pressures of (150, 180, and 150) bar were found for benzocaine, metronidazole benzoate, and naproxen, respectively. The solubility data were correlated with a semiempirical model.

A new homemade disposable screen‐printed carbon electrode consisting of graphite and cellulose acetate printing ink modified with the ionic liquid 1‐octyl‐3‐methylimidazolium hexafluorophosphate ([OMIM][PF6]) and Ag nanoparticles for electrochemical determination of Metronidazole (MTZ) is introduced. The electroanalytical performance of the modified screen‐printed electrode for reduction of MTZ based on differential pulse voltammetry was intensively evaluated. The response of the developed electrode exhibited well bimodal linear behavior in the MTZ concentration range between 3.1–310 µM and 310–1300 µM with a detection limit of 0.4 µM. The developed electrode was applied to the determination of MTZ in pharmaceutical and human urine samples.