Abstract: The present invention provides a method of detecting trace anions in solutions at a parts per billion (ppb) concentration level or less using existing anion detection technology, by employing a novel sample preparation method conducted prior to injection into a detection unit. The method includes the steps of: adding a precipitant to at least a portion of the solution; evaporating the solution, whereby a trace anion-rich solution is formed; and detecting the level of the trace anions in the trace anion-rich solution to at least a ppb concentration level. As such, any existing detection unit designed for measuring anions, known to those skilled in the art, can be used without modification. This results in a cost and time effective method of detecting trace anions in solution at a ppb concentration level. The invention also provides a system for effectuating the novel method of the present invention.