1. A fluid analyzer for evaluating a fluid sample containing a reference component and at least one other component, the fluid analyzer comprising: an optical analyzer adapted to receive at least a portion the fluid sample, the optical analyzer configured to determine an optical property of the fluid sample and to provide an optical analyzer output signal related to the determined optical property; a composition analyzer also adapted to receive at least a portion of the fluid sample, the composition analyzer configured to determine an elemental composition of the fluid sample and to provide a composition analyzer output signal indicative of the determined elemental composition; and a data processor in communication with each of the optical analyzer and the composition analyzer, the data processor configured to determine a quantity of a target component of the at least one other components in response to receiving the optical analyzer output signal and the computational analyzer output signal.