An apparatus for chemical treatments has an enclosed vessel provided with lines for conveying samples and selectively openable valves in communication with sources of gases at atmospheric, increased, and reduced pressures. A plurality of such vessels may be combined, instead, in which case the pressure of the atmosphere in each vessel is made higher than that in the following vessel, so that the sample can be transferred to the following vessels. The vessel or vessels may be equipped with means for agitation, fixed-quantity sampling, liquid level detection, washing, filtration, extraction, thermostatic control, aeration, thermal concentration and distillation. An additional vessel equipped with pH-adjusting means and capable of maintaining an atmospheric pressure inside may be installed.
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