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EC number: 215-269-1 | CAS number: 1317-38-0
Validity criteria were considered to have been met (Temperature between 20 & 25°C; dissolved oxygen concentration above 70% of its saturation in air; pH around 0.2 units difference from the desired pH).
The temperature of the test media varied between 20 and 24 °C. The O2 concentrations of the test media varied between 6.76 and 8.42 mg O2/L. The pH of the media varied between 5.92 and 6.35 (pH 6 media), 6.88 and 7.25 (pH 7 media), 7.82 and 8.15 (pH 8 media). A small and short term deviation in desired pH was only noted for the pH 6 media after 24 hours stirring: pH of 6.35 instead of 6 +/- 0.2.
A transformation/dissolution test was carried out with copper oxide in accordance with OECD guidelines and standard operating procedures proposed by CANMET and LISEC. For the acute classification, tests were performed in modified OECD 203 media at pH , 6, 7 and 8 over a period of 7 days. The loading rates were 1, 10 and 100 mg/L loading ad the stirring rate was 100 rpm. The long term (chronic) assays were performed at 1 mg/L loading for 28 days, in the same type of media and pHs.
Three vessels were used for each loading rate (total 9 vessels), plus 3 blank vessels per pH. The same orbital shaker was used for all 12 vessels under the same CO2 atmosphere (pH 6.0 and 7.0). A 13th proxy vessel was also added to account for the possibility of metal contamination from the electrodes. At each time interval, 3 replicates were taken from each test vessel and the dissolved copper concentration was measured using ICP-MS. Validity criteria were considered to have been met.
It was found that dissolved copper concentrations increased with time, with the highest dissolved copper concentrations observed at the end of the test periods. The rate and extent of transformation/dissolution of CuO was related to loading rate and inversely related to pH of the test media. The lowest extent of transformation/dissolution was observed for the 1 mg CuO/L loading rate at pH 8. The highest extent of CuO transformation/dissolution was reached at pH 6 and a loading of 100 mg CuO/L.
A tabulated summary of the short term (7 days) and long term (28 days) transformation/dissolution data obtained for CuO at different loadings and pHs are shown in Overall remarks, attachments.
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