Systems, methods, and sampling probes for chemically testing a liquid sample are provided. In accordance with one embodiment of the present disclosure, a system generally includes a sample container for containing a liquid, wherein the liquid includes a chemical compound of interest and a reducing agent, and a non-corrosive sampling probe comprising a first channel for delivering a flow of gas to the liquid sample, and a second channel for purging sample fluid from the sample container, wherein at least a portion of the sampling probe is in contact with the liquid.