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(c) Cadmium is a toxic metal and a major component of lightweight batteries. There has been growing concern regarding the disposal of batteries in landfill sites and the possibility of a major contamination problem as the batteries corrode. The data shown below were obtained by amperometric analysis of samples as part of a monitoring procedure established at a local landfill site. [Cd] / μgLI | 0.0 | 5.0 | 10.0 | 15.0 | 20.0 | 25.0 Current / HA0.00.4130.7931.2001.660 2.080 When these calibration data were plotted using linear regression a correlation coefficient, R2, of 0.9992 and a line of best fit were obtained; y = 0.0831x-0.0146 Use the sample data below to determine the concentration of cadmium (in ugL1) in the original run-off samples, which had been diluted by a factor of 50. (RAM cadmium 112.41) Sample No. Sample 1 Sample 2 Sample 3 Sample 4Sample 5Sample 6 Current / HA 0.570.540.63 0.690.530.62 (4 marks)

Answer 1

Solution:

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