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Detection of heavy metal ions by ISFETs in a flow injection analysis cell

✍ Scribed by P.L.H.M. Cobben; R.J.M. Egberink; J. Bomer; J.R. Haak; P. Bergveld; D.N. Reinhoudt

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 489 KB
Volume: 6
Category: Article
ISSN: 0925-4005
DOI: 10.1016/0925-4005(92)80075-9

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✦ Synopsis

An ion-selective field-effect transistor (ISFET) is chemically modified with a photopolymerizable and cyanopropyl modified polysiloxane containing N,N,N',N'-tetrabutyl-3,6-dioxaoctane-dithioamide as Cd'+ ionophore. This CHEMFET has a Nernstian response (30 mV/decade) to a change of cadmium activity in aqueous solutions. Selectivity coefficients of the CHEMFET towards potassium, calcium, copper, and lead are given. Preliminary results of the CHEMFET in a flow injection analysis cell without wire bonding and polymeric encapsulation are presented.

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