سال انتشار: ۱۳۸۷

محل انتشار: همایش بین المللی ژئولیت ایران

تعداد صفحات: ۶

نویسنده(ها):

چکیده:

The utility of carbon paste electrode modified with SMZ (Na-Y zeolite modified with HDTMA
surfactant) for the potentiometric determination of phosphate in aqueous solution is demonstrated. The
electrode exhibits linear response to phosphate over a wide concentration range (1.58 × ۱۰-۵ – ۱٫۰۰ × ۱۰-۲ M)
with Nernstian slope of 30 ± ۲ mV per decade in temperature range 25 to 50 oC . It has a response time of
about 15 s and can be used for a period of two months with good reproducibility and repeatability. The
detection limit of this electrode was 1.5 × ۱۰-۵ M. The electrode response for phosphate determination in pH
range 6-12, was constant and independent from pH. This chemically modified carbon paste electrode was
successfully used for the determination of phosphate in ammonium phosphate chemically fertilizer sample.