a distal tip , and associated method of producing , of a biosensor ion sensing transducer for use in detecting an analyte comprising an halogenated organic compound in an environment such as soil or an aqueous environment . features include : a biocomponent comprising at least one enzyme for carrying out a dehalogenation of the compound ; the biocomponent is immobilized to a surface of the tip ; a treatment of the biocomponent for maintaining a period of enzymatic efficacy ; and the biocomponent stabilized by means preferably selected from the group consisting of crosslinking a surface of the immobilized biocomponent , crosslinking a polymer layer to the biocomponent , adding a gel - hardening agent to the biocomponent , adding a stabilizing agent to the biocomponent , and modifying a component of the immobilizing means . immobilization can be carried out by : entrapment within a hydrogel ; entrapment within a polymeric network ; encapsulation ; covalent - bonding ; and adsorption . the dehalogenase of the biocomponent may be selected from the group consisting of hydrolases , subclass ec 3 . 8 , and lyases , subclass ec 4 . 5 as listed in table 2a .