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Electroanalysis at Salt – Cotton – Electrode Interfaces: Preconcentration Effects Lead to Nano‐Molar Hg 2+ Sensitivity
Author(s) -
Shariki Sara,
Dale Sara E. C.,
Marken Frank
Publication year - 2011
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201100292
Subject(s) - glassy carbon , cyclic voltammetry , electrode , ammonium nitrate , redox , materials science , electrochemistry , salt (chemistry) , analytical chemistry (journal) , inorganic chemistry , chemistry , environmental chemistry , organic chemistry
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.