Hexamethyldisilazane Modified Paper as an Ultra-sensitive Platform for Visual Detection of Hg<sup>2+</sup>, Co<sup>2+</sup>, Zn<sup>2+</sup> and the Application to Semi-quantitative Determination of Hg<sup>2+</sup> in Wastewater

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  • Hexamethyldisilazane Modified Paper as an Ultra-sensitive Platform for Visual Detection of Hg²⁺, Co²⁺, Zn²⁺ and the Application to Semi-quantitative Determination of Hg²⁺ in Wastewater

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Abstract

The present article reports the application of hexamethylsilazane (HMDS) modified filter paper for ultrasensitive detection of Hg2+, Co2+ and Zn2+. By chemical vapor deposition of HMDS, a highly hydrophilic filter paper was fabricated to a low wetting (hydrophobic) substrate. The water contact angle (θ) of modified paper was ∼128°, whereas scanning electron and atomic force microscopy confirmed the surface modification. Using chromogenic reagents, a one-step assay for aforementioned ions was demonstrated onto pristine as well as hydrophobic paper. The assay was completed in less than 10 min and the end-result was in form of a color change that could be easily read by the naked eye. The limit of detection on modified paper was 0.5 ppb, which was 5-order of magnitude superior to that observed on pristine paper. The proposed method was successfully applied for semi-quantitative determination of Hg2+ ions in real wastewater samples.

Journal

  • Analytical Sciences

    Analytical Sciences 32 (5), 491-497, 2016

    The Japan Society for Analytical Chemistry

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