Development of Cellulosic Paper-Based Test Strips for Mercury(II)‎ Determination in Aqueous Solution

Abstract EN

Titration method (dropping-on method) was introduced as an efficient approach for determining the mercury ion (Hg2+) concentration in aqueous solution by using fabricated cellulosic paper-based test strips.

In this study, dithizone used as a recognition reagent was physically loaded on cellulosic paper-based test strips for Hg2+ selective recognition.

The sensing mechanism was established on the spectral absorption rate of the coordination compound that was formed by dithizone and Hg2+ under strong acidic conditions.

The calibration curve was obtained by the absorbency of Hg2+-dithizone complexes from different Hg2+ concentration solutions, and the correlation coefficient (R2) reached 0.9971.

The detection range of the test trip for Hg2+ was obtained at 0.1 μg/mL to 30 μg/mL.

Moreover, these superior cellulosic paper-based test strips have a rapid color-forming time (1.5 min) and low volume demand (3.7 μL samples at 0.0127 g/L dithizone recognition concentration).

This portable paper-based test strip can give potential applications for field screening or on-site semiquantitative analysis.