TY - JOUR

T1 - A new pH sensor with a PVC membrane

T2 - Analytical evaluation and mechanistic aspects

AU - Lutov, V. M.

AU - Mikhelson, K. N.

PY - 1994/4

Y1 - 1994/4

N2 - PVC membranes bases on a new hydrogen-selective neutral carrier hexabutyl-tri-amidophosphate (HBTAP) are presented. These membranes also inlcude tetrakis(p-chlorophenyl)borate(TCPB) as the cation-exchanger, dioc-tylphthalate as plasticizer, and PVC. The electrodes provide a pH response in the working pH range 0-6. They can be used in HF solutions up to 0.1 mol/l. The selectivity coefficients of the electrodes, log KHM for ion M are: Li+, -5.3; Na+, -5.3;K+, -6.2;NH4+, -4.7;Cu2+, -5.0. The hydrogen ions in the membrane form the complexes H(HBTAP)2+. The polarization phenomena at the membrane/solution interface were of the diffusional type. The diffusion coefficients of the H(HBTAP)2+ complexes in the membrane ar estimated as D{all equal to}3×10-7 cm2 s-1 and the dissociation degree of the salt H(HBTAP)2TCIPB as 0.1-0.5%.

AB - PVC membranes bases on a new hydrogen-selective neutral carrier hexabutyl-tri-amidophosphate (HBTAP) are presented. These membranes also inlcude tetrakis(p-chlorophenyl)borate(TCPB) as the cation-exchanger, dioc-tylphthalate as plasticizer, and PVC. The electrodes provide a pH response in the working pH range 0-6. They can be used in HF solutions up to 0.1 mol/l. The selectivity coefficients of the electrodes, log KHM for ion M are: Li+, -5.3; Na+, -5.3;K+, -6.2;NH4+, -4.7;Cu2+, -5.0. The hydrogen ions in the membrane form the complexes H(HBTAP)2+. The polarization phenomena at the membrane/solution interface were of the diffusional type. The diffusion coefficients of the H(HBTAP)2+ complexes in the membrane ar estimated as D{all equal to}3×10-7 cm2 s-1 and the dissociation degree of the salt H(HBTAP)2TCIPB as 0.1-0.5%.

UR - http://www.scopus.com/inward/record.url?scp=0028410297&partnerID=8YFLogxK

U2 - 10.1016/0925-4005(93)01010-2

DO - 10.1016/0925-4005(93)01010-2

M3 - Article

AN - SCOPUS:0028410297

VL - 19

SP - 400

EP - 403

JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

SN - 0925-4005

IS - 1-3

ER -