A continuous electrochemical concentrator suitable for use in an analytical system comprising: (a) a water generator compartment having an outlet, (b) an anode compartment disposed adjacent one side of said generator compartment and configured to contain a first portion of analyte anion- and cation-containing water sample, (c) a cation exchange barrier directly adjacent said anode compartment and separating said generator compartment from said anode compartment, said cation exchange barrier being capable of passing cations but not anions and of blocking bulk liquid flow, (d) a first electrode in electrical communication with said anode compartment, (e) a cathode compartment disposed adjacent one side of said generator compartment and configured to contain a second portion of analyte anion- and cation-containing water sample, (f) an anion exchange barrier directly adjacent said cathode compartment and separating said generator compartment from said cathode compartment, said anion exchange barrier being capable of passing anions but not cations and of blocking bulk liquid flow, (g) a second electrode in electrical communication with said cathode compartment, and (h) a detector in fluid communication with said water generator compartment outlet in the absence of a sample injector for the supply of sample, other than sample supplied from said water generator compartment outlet, disposed between said generator compartment outlet and said detector, characterized in that said generator compartment is configured to electrochemically generate a water product sample including analyte cations and anions passed through said cation and anion exchange barriers (18, 20) and said detector is configured to detect said analyte anions and cations in said water product sample. (a) a water generator compartment having an outlet, (b) an anode compartment disposed adjacent one side of said generator compartment and configured to contain a first portion of analyte anion- and cation-containing water sample, (c) a cation exchange barrier directly adjacent said anode compartment and separating said generator compartment from said anode compartment, said cation exchange barrier being capable of passing cations but not anions and of blocking bulk liquid flow, (d) a first electrode in electrical communication with said anode compartment, (e) a cathode compartment disposed adjacent one side of said generator compartment and configured to contain a second portion of analyte anion- and cation-containing water sample, (f) an anion exchange barrier directly adjacent said cathode compartment and separating said generator compartment from said cathode compartment, said anion exchange barrier being capable of passing anions but not cations and of blocking bulk liquid flow, (g) a second electrode in electrical communication with said cathode compartment, and (h) a detector in fluid communication with said water generator compartment outlet in the absence of a sample injector for the supply of sample, other than sample supplied from said water generator compartment outlet, disposed between said generator compartment outlet and said detector, characterized in that said generator compartment is configured to electrochemically generate a water product sample including analyte cations and anions passed through said cation and anion exchange barriers (18, 20) and said detector is configured to detect said analyte anions and cations in said water product sample.