| http://www.w3.org/ns/prov#value | - rculation of the liquid in a closed loop. [0025] According to another aspect of the present invention there is a method for optically analyzing the concentrations of one or more elements in a liquid, by laser-induced plasma spectroscopic analysis, comprising the steps of emitting and focusing laser pulses on a surface of the liquid to generate a plasma that emits optical radiation that contains el
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