8. 1 g of a children's toy was poured with 25 ml of an acid solution. We took 1 ml of the prepared extract from a children's toy and added the background solution to 10 ml. The wave height during polarography was 12 mm. Then 0.1 ml of a standard solution of cadmium with a concentration of 10-3 g/l was added to the solution. The wave height became 25 mm. Calculate the concentration of cadmium in a child's toy.

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