Ultrasensitive Sensor for Uranium Monitoring in Water Ecosystems

Abstract

In the present paper, sensor based on the integrated three-electrode screen-printed system with in situ plated lead film working electrode (SPCE/PbF) was fabricated, and its microscopic and electrochemical characteristics were investigated. For the first time, a new supporting electrolyte composition (CH 3 COONH 4 , CH 3 COOH and NH 4 Cl of pH = 5.9 ± 0.1) has been proposed in order to improve electrochemical response of SPCE/PbF toward U(VI) determination. The differential pulse adsorptive stripping voltammetric (DPAdSV) signal of U(VI) increased linearly from 0.1 to 10 nmol L −1 with limit of detection of 0.019 nmol L −1 and sensitivity of 0.97 ± 0.00015 μA/nmol L −1 . The applicability of the SPCE/PbF for trace concentrations of U(VI) in water samples with the use of resin in order minimalize the influence of organic matrix was successfully demonstrated.

Modified Mesoporous Carbon Material (Pb-N-CMK-3) Obtained by a Hard-Templating Route, Dicyandiamide Impregnation and Electrochemical Lead Particles Deposition as an Electrode Material for the U(VI) Ultratrace Determination

“…To establish the optimal conditions for voltametric determination of U(VI) at the Pb-N-CMK-3/GCE, thoroughgoing studies were carried out. Firstly, in order to improve the electrochemical response of the Pb-N-CMK-3/GCE towards U(VI) determination, the supporting electrolyte composition (CH 3 COONH 4 , CH 3 COOH and NH 4 Cl) was proposed [ 13 ]. Then, the effect of pH buffer over the range from 3.5 to 6.0 was investigated.…”

“…Till now, a number of SV procedures and/or electrode materials for U(VI) determination have been developed [ 10 , 11 , 12 , 13 , 14 ]. One of the most popular sensors involved for U(VI) determination is the hanging mercury drop electrode (HMDE), which has many advantages, but it is rarely applied because of the volatility and toxicity of mercury [ 10 ].…”

“…In 2007, the lead film electrode was proposed for the first time as an alternative to mercury electrodes for U(VI) quantification because of its more environmentally friendly character, possibility of SV measurements in the deoxygenated solutions and wide potential window [ 11 ]. Thus far, several SV procedures with lead-film-based electrodes have been proposed for U(VI) determination [ 12 , 13 , 14 ]. Among them, the lowest detection of 0.011 nM (for an accumulation time of 480 s for the big electrode and 240 s for the small electrode) was obtained using a double accumulation step on two lead film working electrodes [ 14 ].…”

Supporting Electrolyte Manipulation for Simple Improvement of the Sensitivity of Trace Vanadium(V) Determination at a Lead-Coated Glassy Carbon Electrode

“…In our earlier works, we showed a simple way to amplify the analytical signal of U(VI) and Mo(VI) using lead film modified screen-printed carbon electrodes and a new supporting electrolyte composition (CH 3 COONH 4 , CH 3 COOH, and NH 4 Cl) [ 22 , 23 ]. The lead-coated electrode exhibited interesting characteristics, such as a wide potential window and the ability to operate in a wide range of pH media, lower toxicity and volatility compared with the mercury electrodes, good reproducibility, simple preparation, and a simple way of electrochemical surface renewal [ 24 ].…”

Cloud point extraction associated with differential pulse voltammetry: preconcentration and determination of trace uranyl in natural water

“…Electrochemical techniques are attractive for the detection of trace metal ions due to their high sensitivity, low cost, rapid analysis process and suitability for on-site analysis. [28][29][30][31][32] However, some methods of electrochemical analysis for uranium still suffer from interference from co-existing ions, [33][34][35] such as Cu(II), Pb(II), V(IV), etc. A pretreatment method is also necessary for the preconcentration and purification of uranium before detection.…”