Mashhadizadeh Mohammad Hossein, Shoaei Iran Sheikh, Monadi Niaz
Chemistry Department, Shahid Bahonar University of Kerman, 22-Bahman, Kerman 76169133, Iran.
Talanta. 2004 Nov 15;64(4):1048-52. doi: 10.1016/j.talanta.2004.05.005.
A new PVC membrane potentiometric sensor that is highly selective to Fe(III) ions was prepared by using 2-[(2-hydroxy-1-propenyl-buta-1,3-dienylimino)-methyl]-4-p-tolylazo-phenol [HPDTP] as a suitable carrier. The electrode exhibits a linear response for iron(III) ions over a wide concentration range (3.5 x 10(-6) to 4.0 x 10(-2)) with a super Nernstian slope of 28.5 (+/-0.5) per decade. The electrode can be used in the pH range from 4.5 to 6.5. The proposed sensor shows fairly a good discriminating ability towards Fe(3+) ion in comparison to some hard and soft metals such as Fe(2+), Cd(2+), Cu(2+), Al(3+) and Ca(2+). It has a response time of <15s and can be used for at least 2 months without any measurable divergence in response characteristics. The electrode was used in the direct determination of Fe(3+) in aqueous samples and as an indicator electrode in potentiometric titration of Fe(III) ions.
以2-[(2-羟基-1-丙烯基-丁-1,3-二烯基亚氨基)-甲基]-4-对甲苯基偶氮苯酚[HPDTP]为合适载体，制备了一种对Fe(III)离子具有高选择性的新型聚氯乙烯膜电位传感器。该电极在宽浓度范围(3.5×10(-6)至4.0×10(-2))内对铁(III)离子呈现线性响应，每十年超能斯特斜率为28.5(±0.5)。该电极可在pH值为4.5至6.5的范围内使用。与一些软硬金属如Fe(2+)、Cd(2+)、Cu(2+)、Al(3+)和Ca(2+)相比，所提出的传感器对Fe(3+)离子具有相当好的鉴别能力。其响应时间<15秒，可使用至少2个月而响应特性无任何可测量的差异。该电极用于直接测定水样中的Fe(3+)，并用作Fe(III)离子电位滴定的指示电极。
