Abstract
Clinoptilolite was pretreated by mechanical ball-milling method to obtain nano particles and it was modified by hexadecylpyridynium bromide (HDPBr) surfactant to prepare a surfactant modified zeolite (SMZ) as an effective anion exchanger. The obtained SMZ was used as the active ingredient of a PVC membrane electrode which showed the best Nernstian response toward dichromate in the used conditions. The proposed electrode showed linear response in the concentration range of 1.0×10−5 to 5.0×10−2molL−1 dichromate with a detection limit of 5.0×10−6molL−1 at pH=3–6 and a Nernstian slope of 29.9±0.9mV per decade of dichromate concentration.
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