A new beryllium ion-selective membrane electrode based on dibenzo(perhydrotriazino)aza-14-crown-4 ether

作者：Gupta Vinod Kumar^*; Singh Ashok Kumar; Mergu Naveen

来源：Analytica Chimica Acta, 2012, 749: 44-50.

DOI：10.1016/j.aca.2012.08.050

• Beryllium selective electrode
• Dibenzo(perhydrotriazino)aza-14-crown-4 ether
• Poly(vinyl chloride) membrane
• Potentiometry

Beryllium(II) selective electrodes have been fabricated based on poly(vinyl chloride) (PVC) matrix membranes containing newly synthesized neutral carrier dibenzo(perhydrotriazino)aza-14-crown-4 ethers as ionophore. Best performance was exhibited by the membrane having a composition ionophore (Ila):PVC:sodium tetraphenylborate (NaTPB):tributyl phosphate (TBP) in the ratio (w/w; mg) of 5:30:3:65. This membrane worked well over a wide concentration range 7.6 x 10(-6) to 1.0 x 10(-1) M of Be2+ with a Nernstian slope of 30.7 mV per decade of beryllium activity. The response time of the sensor is 15s and the membrane can be used over a period of 4 months with good reproducibility. The proposed electrode works well in a wide pH range 3.0-9.0. It was successfully applied to the determination of beryllium in a mineral sample.

• 出版日期2012-10-24