A novel optical sensor has been developed to measure selenium ions. The sensor membrane was created by mixing xylenol orange (XO) and sodium tetraphenylborate (NaTPB) with a plasticized poly(vinyl chloride) membrane that contained -nitrophenyl octyl ether (-NPOE) as a plasticizer. XO was previously established for use in a colorimeter to measure selenium in water and other media. At pH 6.6, the color of the detecting membrane changed from orange to pink when in contact with Se ions. Various variables affecting the uptake efficiency were evaluated and optimized. Under optimum conditions (, 30% PVC, 60% -NPOE, and 5.0% of both XO and NaTPB for 5.0 min as the response time), the proposed sensor displayed a linear range 10-175 ng mL with the detection and quantification limits of 3.0 and 10 ng mL, respectively. Also, the precision (RSD%) was better than 2.2% for six replicate determinations of 100 ng mL Se in various membranes. For the detection of Se, the selectivity of the sensor membrane was investigated for a number of possible interfering inorganic cations, but no appreciable interference was found. With the use of a 0.3 M HCl solution, the sensor was successfully restored, and the response that may have been reversible and reproducible exhibited an RSD% of less than 2.0%. The sensor has been successfully used to analyze Se ions in environmental and biological materials.
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| http://dx.doi.org/10.1039/d3ra05308c | DOI Listing |
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