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

Table 4

Conditioning time for the SMZ-PVC membrane electrode based on 4% SMZ (−log 𝐶 = 5–2; 𝑛=5) at 25°C.

𝑡 (h)	Slope (mV·decade^‒1)	𝑟^2
2	29.4 ± 1.5	0.9927 ± 0.0069
4	20.6 ± 1.2	0.9682 ± 0.0258
7	45.4 ± 0.74	0.9790 ± 0.0022
10	21.3 ± 1.0	0.9841 ± 0.0071
12	16.7 ± 1.4	0.9746 ± 0.0135
16	22.3 ± 0.84	0.9768 ± 0.0110
24	32.1 ± 2.2	0.9530 ± 0.0110
48	14.4 ± 0.63	0.9748 ± 0.0160