This table provides a comprehensive comparison between the current method of detection, which uses a biosensor, and the previously employed methods for various metals. The key differences between the methods are highlighted, and references for each method are provided for further reading. The metals discussed in the table include Chromic chloride (CrCl₃), Copper (II) sulfate (CuSO₄), Mercuric chloride (HgCl₂), Cadmium carbonate (CdCO₃), and Arsenic chloride (AsCl₃). o AAS (Water and therapeutic mud o GF-AAS (Chinese tea) o GF-AAS (French wine and grapes o XRFS (Soil) o XRFS (Fish tissues) o Amperometric method (Glucose oxidase-functionalized cobalt oxidemodified glassy carbon electrode) The current method uses a biosensor that detects changes in temperature, unlike the previous methods which used various spectroscopy techniques and amperometric methods.