Research Article
Ion-Selective Electrode for Anionic Surfactants Using Hexadecyl Trimethyl Ammonium Bromide-Sodium Dodecylsulfate as an Active Ionophore
Table 2
The life time study of the anionic surfactant selective electrode.
| | Period | Slope | Linear range | Detection limit | | (weeks) | (mV/decade) | (mol L−1) | (mol L−1) |
| | 1 | −58.0 | 5.0 × 10−6 to 2.5 × 10−3 | 2.9 × 10−6 | | 2 | −58.2 | 4.6 × 10−6 to 2.5 × 10−3 | 2.9 × 10−6 | | 3 | −58.4 | 4.7 × 10−6 to 2.5 × 10−3 | 3.0 × 10−6 | | 4 | −58.1 | 5.2 × 10−6 to 2.5 × 10−3 | 3.0 × 10−6 | | 5 | −58.3 | 5.5 × 10−6 to 2.7 × 10−3 | 3.4 × 10−6 | | 6 | −57.9 | 5.9 × 10−6 to 1.9 × 10−3 | 2.2 × 10−6 | | 7 | −58.4 | 6.4 × 10−6 to 2.2 × 10−3 | 3.9 × 10−6 | | 8 | −58.6 | 5.4 × 10−6 to 1.8 × 10−3 | 2.6 × 10−6 | | 9 | −57.8 | 7.1 × 10−6 to 1.5 × 10−3 | 4.9 × 10−6 | | 10 | −58.0 | 6.7 × 10−6 to 2.8 × 10−3 | 3.5 × 10−6 | | 11 | −57.6 | 8.1 × 10−6 to 2.4 × 10−3 | 4.3 × 10−6 | | 12 | −57.4 | 7.8 × 10−6 to 3.1 × 10−3 | 4.1 × 10−6 | | 13 | −57.2 | 8.2 × 10−6 to 3.4 × 10−3 | 5.0 × 10−6 | | 14 | −54.6 | 9.1 × 10−6 to 3.5 × 10−3 | 6.1 × 10−6 | | 15 | −52.1 | 1.1 × 10−5 to 2.9 × 10−3 | 7.6 × 10−6 | | 16 | −41.6 | 2.4 × 10−5 to 3.1 × 10−3 | 1.6 × 10−5 |
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