Electroanalysis at salt - cotton - electrode interfaces: preconcentration effects lead to nano-molar Hg(2+) sensitivity

Reference:

Shariki, S., Dale, S. E. C. and Marken, F., 2011. Electroanalysis at salt - cotton - electrode interfaces: preconcentration effects lead to nano-molar Hg(2+) sensitivity. Electroanalysis, 23 (9), pp. 2149-2155.

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Official URL:

http://dx.doi.org/10.1002/elan.201100292

Abstract

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.

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