Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (01): 1-10.doi: 10.3866/PKU.WHXB201210081

• REVIEW • Previous Articles     Next Articles

Ion Selective Electrodes Based on Sensing Membrane without or with Reduced Amounts of Plasticizer

HUANG Mei-Rong, DING Yong-Bo, LI Xin-Gui   

  1. Institute of Materials Chemistry, Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education, College of Materials Science and Engineering, Tongji University, Shanghai 200092, P. R. China
  • Received:2012-07-20 Revised:2012-10-08 Published:2012-12-14
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20974080).

Abstract:

New membrane matrices used in ion selective electrodes, such as polyacrylate, vinyl resin, silicone rubber, polyurethane, and conducting polymer without or with a reduced amount of plasticizer, are systematically summarized based on the latest literature. Physical and chemical properties of these membrane martrices, as well as their resultant potentiometric sensor performance, are reviewed thoroughly. It is pointed out that these new sensing membrane matrices not only avoid plasticizer leakage that would contaminate biological samples, but also reduce the diffusion coefficients of these sensing membranes by about 3 orders of magnitude, which is very helpful to suppress the ion flux. The lower diffusion coefficient results in falling of a lower detection limit by 5 orders of magnitude compared to the traditional plasticized PVC sensing membrane. At the same time, the selectivity coefficients have also been improved. In addition, these new materials have excellent adhesion properties with solid support materials, which ensure long lifetimes of the ion selective electrodes, especially in solid state electrodes. Unique new potentiometric sensors based on these new sensing membrane materials without or with reduced amounts of plasticizer could play an important role in many areas such as environmental monitoring and food safety, and would be especially useful in medical diagnosis and detection of biomaterials.

Key words: Ion selective electrode, Sensing membrane, Plasticizer-free membrane, Polyacrylate, Vinyl resin, Silicone rubber, Polyurethane

MSC2000: 

  • O646.2