Square wave anodic stripping voltammetric method for thallium in coal ash using a gold electrode modified with a titanium(IV)-oxo-carboxylate cluster-chitosan composite – ScienceDirect.com October 26, 2025 Power (Coal Ash) Square wave anodic stripping voltammetric method for thallium in coal ash using a gold electrode modified with a titanium(IV)-oxo-carboxylate cluster-chitosan composite ScienceDirect.com