Registration Dossier
Registration Dossier
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EC number: 939-692-2 | CAS number: 1474044-73-9
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
Degradation observed at pH 7: 57 % recovery after 11 days at 30 °C and 50 °C, Kobs = 0.270 and 0.219/days, respectively (OECD 111, read-across from supporting substance '1,3,4-Thiadiazolidine-2,5-dithione, reaction products with hydrogen peroxide and tert-nonanethiol')
Key value for chemical safety assessment
Additional information
The hydrolysis reactions of the test material ‘1,3,4-Thiadiazolidine-2,5-dithione, reaction products with hydrogen peroxide and tert-nonanethiol’ with CAS No. 91648-65-6 (that should be also applicable for the structurally similar long-chain homologue ‘1,3,4-Thiadiazolidine-2,5-dithione, reaction products with hydrogen peroxide and tert-dodecanethiol') were determined in accordance with the OECD Guideline 111.
A stock solution of test material (63.4 mg/L) was prepared in 2 mL of methanol and then diluted to 1 L with distilled water (< 1 % co-solvent). Aliquots of the stock solution were adjusted to varying pH levels 4.0, 7.0, 9.0 (actual: 4.03, 6.94 and 8.90) using an appropriate 0.05 M buffer, filter-sterilised and incubated at the designated test temperatures (6 °C, 30 °C and 50 °C). The concentration of test material was then determined analytically on days 0, 1, 3, 5, 6, 7, and 11 of the study using high pressure liquid chromatography (HPLC). Significant hydrolysis was only observed for the pH 7 treatment. The reaction rate constant (Kobs) was calculated for the 30 °C and 50 °C test temperatures, Kobs = 0.270 and 0.219/days, respectively.
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