Registration Dossier
Registration Dossier
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EC number: 242-768-1 | CAS number: 19035-79-1
Endpoint summary
Administrative data
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Additional information
A study was conducted to determine the rate of hydrolysis of potassium hexadecyl hydrogen phosphate at different environmentally relevant pH-values by quantifying the test item concentration after different incubation periods and at different temperatures according to OECD TG 111 and Regulation (EC) No 440/2008 method C.7. In a preliminary test the test item was dissolved in aqueous solutions buffered at pH 4, 7 and 9 and incubated at 50 °C ± 4.5 °C for a maximum of 5 days.
No significant reduction of the test item concentration was observed in the samples incubated at pH 7 and 9 after 5 days of incubation (mean recovery > 90 % of the applied concentration).
In the incubated samples at pH 4 a significant reduction of the test item concentration was observed after 5 days of incubation in phosphate and citric acid buffer, respectively (mean recovery 63 – 75 % of the applied concentration).
A main test was performed with a commercially available citric acid buffer solution at pH 4. The test item was dissolved and incubated at 18 °C ± 1.3 °C, 50 °C ± 0.6 °C and 60 °C ± 1.8 °C in the dark. Two test item concentrations (approx. 3 mg/L and 30 mg/L) were used. The concentration of the test item was determined after different incubation times. A LC-MS/MS method was used for quantification of the test item. In course of the test and also in course of sample storage the test item precipitated by the formation of white solid components. In order to execute the test at a pH between 4 to 7, test solutions were prepared with a concentration of approx. 3 mg/L and 30 mg/L. As buffer systems citric acid and acetate solutions were used, both at pH-values of 5 and 6. The solutions were stored at 20 °C ± 1.3 °C in the dark over a period of 13 days. In each case a precipitate was observed. With regard to the observations it was not feasible to investigate the hydrolytic properties of potassium hexadecyl hydrogen phosphate at a pH range of 4-6. Neither degradation rate nor corresponding half life values were calculated as the test item was found to be stable at pH 7 and 9. At pH values of 4, 5 and 6 the test item (partly) precipitated in course of incubation, thus, hydrolysis endpoints could not be determined.
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