A new chemically modified carbon paste electrode for cesium(I) ion determination based on potassium zinc hexacyanoferrate (PZHCF) as an ionophore was prepared. The electrode exhibits a Nernstian response for Cs(I) ions over a wide concentration range from 1 × 10 -6 to 1 × 10 -1 mol·L -1 with a slope of 58 ± 0.5 mV·decade -1. It has a response time of about 35 s and can be used for a period of 3 months with good reproducibility. Detection limit obtained in the optimal conditions was 3 × 10 -7 mol·L -1. The potentiometric response is independent of the pH of the solution in the pH range 4.0 -8.0. The electrode possesses the advantages of low resistance, fast response over a variety of other cations. The proposed electrode is applied as a sensor for the determination of Cs(I) ion concentration in different samples solutions. The results showed a good correlation with the data obtained by atomic absorption spectrometric method.
The release of metals from many industrial processes into aquatic ecosystems is currently a major environmental threat, especially in developing and emerging countries. Most traditional treatment approaches are not efficient in terms of removal yield and cost. Plants have the ability to stabilize metals in a fast and cost-efficient way. In this context, aquatic plants are successfully applied for remediation of hazardous elements from industrial wastewater. This study demonstrates the capability of the wetland macrophyte, Ludwigia stolonifera, in uptake and accumulation of three metal species (Cu, Fe and Mn) dissolved in artificial industrial wastewater. Four days treatment of artificial wastewater containing 100 ppm of Cu, Fe and Mn remove about 86%, 74%, 93%, respectively, of the individual metals. L. stolonifera displayed a considerable metal recovery potential after exposure to different environmental conditions regarding acidity, illumination and metal concentration. The data obtained in this study underline the high capability of L. stolonifera for phyto-mediated purification of wastewater contaminated by metals, which is widely independent from the cultivation conditions.
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