Sources: For dry oxygen, the source of oxidant may be compressed oxygen tanks, which do not have any water contamination. For wet oxidation, the water may be supplied by one of the several methods. An inert gas (called carrier gas) may be bubbled through de ionized water maintained near the boiling point. The saturated water vapor will be heated further to obtain steam. The main drawback of this method is that it is difficult to precisely control the quantity of water varpor entering the system.  Another method involves supplying hydrogen and oxygen gases and producing the water in situ. Sufficient care must be taken to ensure that explosion does not occur. Excess oxygen may be added to ensure that the explosion potential of the system is maintained at a low level.