BULK OPTODES BASED ON NEUTRAL DITHIOCARBAMATE IONOPHORES WITH HIGH SELECTIVITY AND SENSITIVITY FOR SILVER AND MERCURY CATIONS

Authors
LERCHI M REITTER E SIMON W PRETSCH E CHOWDHURY DA KAMATA S
Citation
M. Lerchi et al., BULK OPTODES BASED ON NEUTRAL DITHIOCARBAMATE IONOPHORES WITH HIGH SELECTIVITY AND SENSITIVITY FOR SILVER AND MERCURY CATIONS, Analytical chemistry, 66(10), 1994, pp. 1713-1717
Citations number
10
Categorie Soggetti
Chemistry Analytical
Journal title
Analytical chemistry → ACNP
ISSN journal
00032700
Volume
66
Issue
10
Year of publication
1994
Pages
1713 - 1717
Database
ISI
SICI code
0003-2700(1994)66:10<1713:BOBOND>2.0.ZU;2-J
Abstract
Membranes for optically sensing Ag+ and Hg2+ based on plasticized poly (vinyl chloride) (PVC) containing a metal ion-selective ionophore, a h ydrogen ion-selective chromoionophore, and lipophilic anionic sites ar e presented. Different dithiocarbamate ionophores have been used to de velop novel optical sensors for environmental analysis. Optode membran es based on the ionophore methylene bis(diisobutyldithiocarbamate) (MB DiBDTC) reversibly respond to Ag+ and Hg2+ and show extremely high sel ectivities over Li+, Na+, K+, Mg2+, Cu2+, Cd2+, and Pb2+. The detectio n limit for Ag+ is 2.5 x 10(-9) M at pH 4.7. The dynamic range, respon se behavior, reversibility, and selectivity of the optode membranes ar e discussed.