Corrosion Inhibitor Residuals

Corrosion Inhibitor containing APQ's

Figure 1. Calibration curve of fluorescent imidazoline using a 365 nm excitation.

Quaternary alkyl pyridinium (APQ) salts used in corrosion inhibitors will excite in the UV and emit in the visible range. The LabBox and Open Platform System (OPS) in the fluorescence configuration provide corrosion inhibitor detection with the high accuracy of HPLC testing and better reproducibility than the chloroform extraction method.

For more information refer to:

Corrosion Inhibitor Residual Monitoring Brochure
Corrosion Inhibitor Residual Measurements
Wilson Analytical's CI Determination Procedure
Corrosion Inhibitor Residuals Video Demonstrations

Fluorescence Advantages

  • Accurate & Sensitive

    Identify the presence and concentration of these intrinsically fluorescent corrosion inhibitors with a 1 ppm detection limit.

  • Ease of Sampling

    The only sample preparation necessary is filtration and dilution

  • Precise

    High accuracy of HPLC testing and better reproducibility than the chloroform extraction method.
Method Comparison for Corrosion Inhibitor Residuals Analysis

Corrosion Inhibitors containing Fluorescent Imidazolines

APQ-containing corrosion inhibitors could be quantified using ultraviolet-excitation fluorescence. Engenium Chemicals (Calgary, AB) has recently developed an intrinsically-fluorescent imidazoline corrosion inhibitor, which when formulated into a corrosion inhibitor package provides for fluorescent detection (with UV excitation) with similar detection limits to APQ formulations. Wilson’s instrumentation can thus be used to identify the presence and concentration of these imidazoline-based corrosion inhibitors.