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EC number: 214-183-1 | CAS number: 1111-67-7
In an initial test after 24 h exposure, 100% mortalities were observed in a suspension prepared at a nominal concentration of 100ppm Cuprous Thiocyanate. No mortalities were observed at 0 (Control) ppm.
In a further test after 24 h exposure, 30% mortalities were observed in a suspension prepared at a nominal concentration of 10 ppm Cuprous Thiocyanate. No mortalities were observed in tanks prepared by filtering a suspension prepared at a nominal concentration of 10 ppm Cuprous Thiocyanate. 10 % mortalities were observed at 0 (Control) ppm.
The numbers of dead Daphnia recorded during the study are detailed in Table 3. The LC50 values at 24 and 48 h, with 95% confidence intervals, were calculated by probit analysis:
The 48 h LC50 value was also calculated graphically as 0.02 ppm (see figure 1 in section "Illustrations (graph/picture)".
These values are based on the mean measured concentrations of Cuprous Thiocyanate in the highest tested concentration and calculated concentrations in the remaining test solutions.
Table 3: Determination of Acute Toxicity (LC50) to Daphnia (48h. Static) - Cumulative Number of Mortalities Recorded
* = Concentrations were calculated from that measured in the highest tested concentration and the dilution factors used to prepare the remaining test solutions.
The acute toxicity (EC50) of Cuprous Thiocyanate to Daphnia (Daphnia magna) over a 48 h period, under static conditions, was determined. Test solutions were prepared after removing undissolved Cuprous Thiocyanate, by filtration of a suspension prepared at a nominal concentration of 100 ppm. The intercept and dose response curve and hence EC50 (with 95% confidence limits) were estimated by applying the standard technique of maximum likelihood estimation to the probit model.
Results are as follows:
These values are based on the mean measured concentration of Cuprous Thiocyanate in the highest tested concentration and calculated concentrations in the remaining test solutions.
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