Composition, w/w%

PVC

DTPCX

TpClPB

DOS

NPOE

% ionophore

Slope, mV/decade

I-membrane

60

1

1.2

0

120

1.206

48

II-membrane

60

1.4

1.6

121

0

1.630

32

III-membrane

61.2

2.7

0

0

121.8

1.475

22