By J. R. Erichsen Jones
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Extra info for Fish and River Pollution
M. the volumes used are 4, 7, 10 and 20 1. Alternatively, the fish can be placed in a container through which passes a running supply of solution. This does not necessitate the making u p of very large quantities of solution in the usual way as it is an easy matter to arrange apparatus for making up a test solution automatically. A simple arrangement is shown in Figure 17. T h e vessel A with input and overflow supplies water at a constant rate into the funnel B of a mixing vessel. Into the funnel concentrated solution drips from the aspirator bottle C through a delivery tube drawn out into a fine nozzle.
C) Figure 20. Hypothetical survival curves conforming to the equation of Wuhrmann1 and Burdick10. The equation to curve A is ( C - 0 - l ) 2 ( r - 43) = 10 and that to curve B is ( C - l ) ( r - 5 ) = 10 One cannot assume with safety that the survival time will continue to lengthen with dilution, let alone how fast it will do so. The writer has shown that over the concentration range 0-4-0-0015 N the toxicity of copper nitrate to toad tadpoles increases with dilution. At lower concentrations the survival time lengthens again so that at about 0-0003 N it returns to the value it has at 0-4 N 15.
Even when the results available do give a straight-line graph it may not be safe to assume that the relationship holds at untried dilutions, and estimates of toxicity based on extrapolation may be unreliable. (c) Figure 20. Hypothetical survival curves conforming to the equation of Wuhrmann1 and Burdick10. The equation to curve A is ( C - 0 - l ) 2 ( r - 43) = 10 and that to curve B is ( C - l ) ( r - 5 ) = 10 One cannot assume with safety that the survival time will continue to lengthen with dilution, let alone how fast it will do so.