A method for the quantitation of the naphthenic acid content of molecular weight less than 600 Daltons in a hydrocarbon composition, in which naphthenic acids are separated from the hydrocarbon composition and applied to a macroreticular ion-exchange resin. In other aspects, the present invention is directed a pharmaceutical composition comprising such adjuvant and a pharmaceutically active ingredient; as well as to a method of making the compositions. The test container is incubated to allow bacterial growth and metabolism. The calliper comprising a fluid connection connected to or connectable to a source of hydraulic fluid for leading hydraulic fluid into the void of the cylinder bore below the piston head, so as to move the piston. The control circuit determines that the qualified filter element is installed in the filter housing based on a change in the electrical current in the plurality of wires.