An analytical system for solutions containing soluble solids or high concentrations of dissolved solids. The system includes a container having upper and lower portions; a lead an/or a tubing line extending into the upper portion of the container, for withdrawing a portion of a gas in the upper portion of the container; and a sampling probe extending into the lower portion of the container, for withdrawing a portion of a sample of a liquid or of a mixture of a liquid and a solid. The sampling probe is a probe support shaft which may be provided with a filter for separating liquid and solid phases from one another if the sample is a liquid-solid mixture. Gas in the headspace above the liquid or the liquid-solid mixture can be withdrawn through the lead and/or the tubing line.