تم تصنيع الكترود جديد بغشاء PVC منتقي لأيون اللانثانيوم الثلاثي يعتمد على معقد بارالدهيد فنيل هيدرازون مع اللانثانيوم كمادة فعالة الكتروكيميائيا. أبدى الالكترود الغشائي المحضر انتقائية جيدة تجاه ايون La+3 بوجود العديد من الايونات المعدنية الأخرى , كما درس تأثير العديد من البارمترات على أداء هذا الالكترود , مثل: تركيب و طبيعة المادة الملدنة , و كمية الاضافة المستخدمة ضمن الغشاء , فكانت استجابة الالكترود نيرنستية أو بقرب النيرنستية تبعا لطبيعة الملدن المستخدم عند ثبات النسب الأخرى من مكونات الغشاء , بمجال خطي واسع يتراوح بين ( M 1×10-7 M - 1×10-1) بميل 20±1 mv/decade و حد كشف بحدود M 7×10-8 , كما انه يعمل ضمن مجال pH واسع يتراوح بين 3,8-8 و زمن استجابة أقل من 30 ثانية , و استخدم الالكترود المقترح بنجاح لتحديد ايون اللانثانيوم الثلاثي في عينات مائية قياسية , كما يمكن استخدامه بصفة الكترود كاشف في المعايرة الكمونية باستخدام EDTA .
In this study, a new poly(vinyl chloride) (PVC) membrane electrode for La3+ ion based on paraldyhed phenyl hedrazon as an electroactive material was prepared.This electrode revealed good selectivity for La3+ over a wide variety of other metal ions. Effects of experimental parameters such as membrane composition, nature and the amount of plasticizer, the amount of additive on the potential response of La3+ electrode were investigated. The electrode exhibited a Nernstian slope of 20.0±1.0mV per decade of La3+ over a concentration range of 1×10-7 to 1×10-1M of La3+ in the pH range 3.8–8.0. The response time was about 30 s and the detection limit was 7×10-8 M. The electrode couldbe used for at least one month without a considerable divergence in potential. The proposed electrode was used for the determination of lanthanum in a standard solations andwas successfully applied as an indicator electrode for potentiometric titration of La3+ with EDTA.
References used
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YUAN,X.; CHAI ,Y.;YUAN, R.; ZHAO, Q. Improved potentiometric response of solid-contact lanthanum (III) selective electrode .Analytica Chimica Acta ,779 ,2013, 35– 40
AKHOND ,M.; NAJAFI, M, B.; TASHKHOURIAN, J. Lanthanum-selective membrane electrode based on 2,2_-dithiodipyridine. Analytica Chimica Acta ,531, 2005, 179–184
A new polyvinylchloride membrane sensitive to Cd+2 ions basede on 1,3-diphenyl-5-P-nitrophenylformazan as ionophore has been prepared. This electrode shows a Nernestian response for cadmuim ions over a wide range ( 1.0 ×10-6 to 1.
This paper outline a new, simple, selective and sensitive spectrophotometric
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