Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10529535 | Analytica Chimica Acta | 2005 | 7 Pages |
Abstract
Attempts have been made to develop a poly(vinyl chloride) (PVC) based sensor for CrO42â ions using positively charged diaza crown ethers (12-crown-4 and 18-crown-6) with dibutylphthalate (DBP), dioctylphthalate (DOP) and chloro naphthalene (CN) and dioctylsebacate (DOS) as plasticizing solvent mediators. These sensors work well over a wide concentration range 5.0 Ã 10â6 to 1.0 Ã 10â1 M (detection limit up to 0.3 ppm) with Nernstian slope (29.6 mV/decade) between pH 6.5 to 10.0 with a fast response time of <10 s. The selectivity coefficient values as determined by Match Potential Method (MPM) indicate excellent selectivity for Cr(VI) ions over a large number of ions. Interference caused by common anions, viz. Clâ and SO42â has been investigated in simulated mixtures containing high concentration level of interfering ions and the sensor was found to be tolerant against these anions. These sensors exhibit adequate shelf-life (>3 months) with good reproducibility (S.D. ±0.2 mV). Quantification of Cr(VI) in electroplating waste was successfully achieved using the proposed sensor.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
L.P. Singh, J.M. Bhatnagar, S. Tanaka, H. Tsue, M. Mori,