Novel ZrO2+ Ion-selective Electrode Based on a Hexa Cosine Compound in PVC Matrix
Subject Areas : نانومواد و پلیمرهای هوشمند
مسعود گیاهی
1
(گروه شیمی، واحد تهران جنوب، دانشگاه آزاد اسلامی، تهران، ایران)
خورشید مهدی زاده
2
(گروه مهندسی پلیمر، واحد تهران جنوب، دانشگاه آزاد اسلامی، تهران، ایران)
نیلوفر رفیع زاده زعیم
3
(دانشگاه آزاد اسلامی واحد تهران جنوب، دانشکده فنی و مهندسی،گروه مهندسی پلیمر)
Keywords: Potentiometry, PVC membrane, Metal ions, Selectivity, ZrO2+ sensor,
Abstract :
A novel PVC membrane electrode that is highly selective to ZrO2+ ions was prepared using 4,7,13,16,21,24-hexa oxa-1,10- diazabicyclo [8,8,8]- hexa cosine (HODBHC) as a suitable neutral carrier. The sensor exhibited a linear dynamic range between 1.0×10-1 and 1.0×10-6 M, with a near-Nernstian slope of 29.9 ± 0.4 mV per decade at 25 °C, and was found to be very selective, precise, and applicable within the pH range of 5.0–8.0. The sensors showed a response time of <15s and can be used for at least 3 months without any measurable divergence in potential. The limit of detection was 8.0× 10-7 M. The electrodes possess the advantages of low resistance, very fast response time, and a relatively long lifetime. The proposed sensors showed a fairly good discriminating ability towards ZrO2+ ion in comparison with some hard and soft metal ions. It was used as the indicator electrode in the potentiometric determination of ZrO2+ ions by the standard addition method in two samples.
