Research Article
Partial Least Squares (PLS) Integrated Fourier Transform Infrared (FTIR) Approach for Prediction of Moisture in Transformer Oil and Lubricating Oil
Table 1
Summary of literature studies of moisture in oil using FTIR.
| | Types of oil (moisture range) | Spectral region used (matrix of moisture) | Reference |
| Motor oil (200–1568 ppm)
Hydraulic oil (200–800 ppm) | 3400 cm−1 (water in oil) | Henning [15] | | Transformer oil (2–43 ppm) | 3616 cm−1 (water in acetonitrile) | Hadjadj et al. [8] | | Edible oil (0–2000 ppm) | 3629 cm−1 (water in dioxane) | Van de Voort et al. [16] | | Crude Palm oil (0–13%) | 3700 cm−1 (water in oil) | Che Man and Mirghani [17] | | Edible oil (0–1000 ppm) | 1631 cm−1 (water in acetonitrile) | Meng et al. [14] | | Biodiesel (0–10%) | 3750–3700 and 1700–1500 cm−1 (water in oil) | Mirghani et al. [12] | | Turbine oil (30–1460 ppm) | 3410 and 3454 cm−1 (water in oil) | Higgins and Sleenbinder [11] | | Lubricating oil (0.1–3.7%) | 3600–3100 cm−1 (water in oil) | Blanco et al. [18] | | Lubricating oil (100–4000 ppm) | 5400–4900, 3750–3200, 1800–1500 cm−1 (water in DMSO) | Ng and Mintova [4] | | Lubricating oil (0–2100 ppm) | 3676 cm−1 (water in acetonitrile) | Van de Voort et al. [5] |
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