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EC number: 926-126-4 | CAS number: -
- The linearity of the detector response with respect to concentration was assessed over the nominal concentration range of 120 to 1.20 x 10E03 mg/L.
- The results were satisfactory with a correlation coefficient (r) of 0.999 being obtained.
Assessment of hydrolytic stability was carried out using Method C.7 Abiotic Degradation, Hydrolysis as a Function of pH of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 111 of the OECD Guidelines for Testing of Chemicals, 13 April 2004.
The test system consisted of buffer solutions at pH 4, 7 and 9. The buffer solutions were passed through a 0.2 μm membrane filter to sterilise and subjected to ultrasonication and degassing with nitrogen to minimise dissolved oxygen. Duplicate sample solutions were taken initially and from the water bath at various time points. The pH of each solution recorded. The concentration of test item in the sample solutions was determined by high performance liquid chromatography (HPLC).
Stock solutions of test item were prepared at a nominal concentration of 1.0 x10E03 mg/L in the three buffer solutions. At this concentration the pH 4 stock precipitated. It was therefore passed through a filter paper and the filtrate diluted by a factor of 2 with the pH 4 buffer solution. This produced a stock solution than was half saturation as required by the test guidelines.
The stock solutions were split into individual glass vessels, sealed with minimal headspace, for each data point. These sample solutions were shielded from light whilst maintained at the test temperature.Sample solutions at pH 4, 7 and 9 were maintained at 50.0 ± 0.5 °C for a period of 120 hours.
The estimated half-life at 25 °C of the test item was shown to be greater than 1 year at pH 4, 7 and 9.
The estimated half-life at 25 °C of the research material was shown to be greater than 1 year at pH 4, 7 and 9 (OECD 111 and EU Method C.7).
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