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The stability of sodium 3(2H-benzotriazol-2-yl)-5-sec-butyl-4-hydroxybenzenesulfonate in water was investigated according to OECD guideline 111. The hydrolysis of the test item was investigated at 50 °C and pH 4, 7 and 9 in the preliminary test. At 50°C the hydrolysis of test item was less than 10 % at pH 4, 7 and 9. The test item is thus considered stable at pH 4, 7 and 9 and 50°C with a half-life period of more than one year at 25 °C and pH 4, 7 and 9.

Furthermore, sodium 3(2H-benzotriazol-2-yl)-5-sec-butyl-4-hydroxybenzenesulfonate was tested in a biodegradation test according to OECD giudeline 301A (modified Afnor-Test) using a concentration of nominally 40 mg/L DOC. The test was left running for 28 days.

Glucose was chosen as positive control. Biodegradation of the positve control corrected by the blank control and mesured as DOC (mg/L) was 87.5 % (28th day). The biodegradation of the test item corrected by blank control and measured as DOC (mg/L) is 0 % (28th day). No inhibiton on the activity of the bacteria was found. The test item is therefore evaluated as not ready biodegradable and not bacteric toxic at the test concentration of 40 mg/L.