System and method to measure dissolved gases in liquid

A method for continuously measuring a concentration of at least one pre-selected dissolved analyte in a first sample water obtained from a quantity of water during a selected time period, comprising:

• selecting a first processing cell having at least a first conduit defining a first passage with at least one selectively-permeable wall configured to pass at least the at least one pre-selected dissolved analyte through the at least one selectively-permeable wall into a processing liquid, the at least one selectively-permeable wall resisting flow of a portion of the first sample water therethrough, the at least one selectively-permeable wall extending along a second conduit defining a second passage through which the first sample water is conducted, and the at least one selectively-permeable wall being in contact with the first sample water in the second conduit;
• continuously directing processing liquid through the first conduit while continuously moving the first sample water and the processing liquid relative to each other in one of a concurrent and a countercurrent flow relationship while being separated from one another via the at least one selectively permeable wall to generate a first at least partially equilibrated processing liquid and a processed sample;
• and
• measuring, utilizing at least one detector, the concentration of the at least one pre-selected dissolved analyte in a homogenous portion of one of either the first at least partially equilibrated processing liquid obtained from the first conduit and the processed sample obtained from the second conduit, wherein at least one guide is (i) operatively connected to the at least one detector and the first processing cell and (ii) configured to transmit electromagnetic energy to the at least one detector from the first processing cell, wherein the at least one detector utilizes the transmitted electromagnetic energy to measure the concentration of the at least one pre-selected dissolved analyte, and wherein the processing liquid and the first sample water are moved continuously through the first processing cell during measurement.