Modification of Nanoclinoptilolite Zeolite with Hexadecyltrimethylammonium Surfactant as an Active Ingredient of Chromate-Selective Membrane Electrode

Table 1

Potentiometric response of the SMZ-PVC electrode toward different anions (𝑛=5) with each electrode conditioned in a 0.01 M solution of the corresponding anion for 2 h at 25 (membrane includes 4% SMZ).

Anion	Slope (mV·decade^−1)	𝑟^2	Linear range (−log 𝐶)
Benzoate	−35.0 ± 1.1	0.9705 ± 0.0137	2–4
ClO3^−	−36.3 ± 1.3	0.9975 ± 0.0018	1–4
CN^−	−46.4 ± 1.4	0.9936 ± 0.0113	3–5
I^−	−40.0 ± 0.9	0.9980 ± 0.0005	1–5
NO3^−	−19.9 ± 0.5	0.9896 ± 0.0136	1–4
C2O4^2−	−43.5 ± 0.6	0.9811 ± 0.0072	2–4
ClO4^−	−41.8 ± 1.7	0.9910 ± 0.0053	1–4
CrO4^2−	−29.0 ± 0.6	0.9965 ± 0.0061	2–5