Electroanalysis at Salt - Cotton - Electrode Interfaces: Preconcentration Effects Lead to Nano-Molar Hg(2+) Sensitivity

Cotton is employed as a sample absorbent which is analysed sandwiched between a glassy carbon electrode and ammonium nitrate salt in a humidified argon atmosphere (ca. 80 % relative humidity). Exploratory experiments show that well-defined voltammetric responses for the Fe(CN)(6)(3 -/4- )redox system pre-absorbed into cotton are observed. Experiments with gold plating solution absorbed into cotton reveal the microscopic regions (cotton - glassy carbon contact points) of electrochemical activity where gold microparticles are plated onto the cotton surface. Stripping voltammetry experiments for trace metals such as Hg(2+) pre-absorbed into cotton show a surprisingly high sensitivity with nanomolar detection readily achieved.