A total organic carbon analyzer, comprising: a housing comprising: a reaction chamber including an electrochemical cell and wherein the electrochemical cell comprises a solid free-standing and substrate-less SP3 substituted carbon electrode doped with a conductivity elevating composition; a gas flow control unit for introducing air into the reaction chamber; an electrical generator for applying a positive potential to the solid free-standing and substrate-less SP3 substituted carbon electrode; a reagent introduction mechanism connected to the reaction chamber; and at least one detector; the total organic carbon analyzer being configured to: receive, in the reaction chamber, a fluid sample comprising organic carbon; apply a positive potential to the SP3 substituted carbon electrode, the positive potential being sufficient to oxidize organics in the fluid sample to produce carbonate and partially oxidized organics; introduce via the reagent introduction mechanism, in the reaction chamber prior to or substantially simultaneously during application of the positive potential to the SP3 substituted carbon electrode, at least one acid reagent comprising a metallic catalyst that converts the carbonate and the partially oxidized organics to carbon dioxide; and detect, using the at least one detector, the carbon dioxide produced by the oxidation. a housing comprising: a reaction chamber including an electrochemical cell and wherein the electrochemical cell comprises a solid free-standing and substrate-less SP3 substituted carbon electrode doped with a conductivity elevating composition; a gas flow control unit for introducing air into the reaction chamber; an electrical generator for applying a positive potential to the solid free-standing and substrate-less SP3 substituted carbon electrode; a reagent introduction mechanism connected to the reaction chamber; and at least one detector; a reaction chamber including an electrochemical cell and wherein the electrochemical cell comprises a solid free-standing and substrate-less SP3 substituted carbon electrode doped with a conductivity elevating composition; a gas flow control unit for introducing air into the reaction chamber; an electrical generator for applying a positive potential to the solid free-standing and substrate-less SP3 substituted carbon electrode; a reagent introduction mechanism connected to the reaction chamber; and at least one detector; the total organic carbon analyzer being configured to: receive, in the reaction chamber, a fluid sample comprising organic carbon; apply a positive potential to the SP3 substituted carbon electrode, the positive potential being sufficient to oxidize organics in the fluid sample to produce carbonate and partially oxidized organics; introduce via the reagent introduction mechanism, in the reaction chamber prior to or substantially simultaneously during application of the positive potential to the SP3 substituted carbon electrode, at least one acid reagent comprising a metallic catalyst that converts the carbonate and the partially oxidized organics to carbon dioxide; and detect, using the at least one detector, the carbon dioxide produced by the oxidation. receive, in the reaction chamber, a fluid sample comprising organic carbon; apply a positive potential to the SP3 substituted carbon electrode, the positive potential being sufficient to oxidize organics in the fluid sample to produce carbonate and partially oxidized organics; introduce via the reagent introduction mechanism, in the reaction chamber prior to or substantially simultaneously during application of the positive potential to the SP3 substituted carbon electrode, at least one acid reagent comprising a metallic catalyst that converts the carbonate and the partially oxidized organics to carbon dioxide; and detect, using the at least one detector, the carbon dioxide produced by the oxidation.