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. <EOS>