Dear Sir. Concerning your issue about the detection and quantification of lithium from the aqueous solution of its chlorides following some electroanalytical method. A highly sensitive and reliable electrochemical method is proposed for the determination of the lithium ion concentration in an aqueous medium by measuring the electromotive force between the medium and a powdery non-selective electrode, which is a non-stoichiometric composite oxide of lithium and manganese of the formula Lix Mn2 O4, x being a positive number smaller than 1, prepared by partially leaching lithium ions out of a spinel-type lithium manganate LiMn2 O4 with an acid, dipped in the medium. The ion-selective electrode can be in the form of a thin film or coating layer on an electrode element. This film or layer can be formed of a polymeric resin as a binder for the powdery composite oxide. I think the following below links and the attached file may help you in your analysis:
https://www.google.ch/patents/US4956062
http://www.sciencedirect.com/science/article/pii/S0021967315009279
Thanks
A flame photometer should do the job for Li, Na, K. The optical filter for Li must be present in the instrument.
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