Abstract: A heat exchanger has a first inlet in fluid communication with a tank that contains a first chemical solution of a known concentration, and a second inlet in fluid communication with a conduit. The conduit is in fluid communication with a process tool and conveys a second chemical solution from the process tool to the second inlet. The heat exchanger receives a quantity of the first chemical solution via the first inlet and a quantity of the second chemical solution via the second inlet, and adjusts a temperature of the received quantity of the first chemical solution to bring the temperature of the received quantity of the first chemical solution toward a temperature of the received quantity of the second chemical solution. The temperature-adjusted first chemical solution can be selectively provided to an analytic flow cell for verification and/or calibration of the flow cell.