Mercaptobenzothiazole (MBT) is formulated with various water treatment products to prevent corrosion of copper and copper-containing metals. These tests are particularly well suited to the monitoring of closed loop cooling water systems and utility condensers where high MBT concentrations are usually maintained. 

CHEMetrics employs a titrimetric chemistry in which MBT is titrated with potassium permanganate in an acidic medium. No additional end point indicator is required. A color change from dark pink to colorless signals the end of the titration. Results are expressed as ppm (mg/L) MBT.