Mean concentration of Cd in mg Cd per gram wet weight?

Question

Mussels were collected from near a copper processing plant and analysed to determine levels of Cd.

5 mussels were individually homogenised. Portions were weighed, digested, cooled and diluted to 50mL. AAS was used to determine the Cd concentration of each. From the data obtained (tabulated below) calculate the mean concentration of Cd in mg Cd per gram wet weight in the mussels.

Sample no. Wet Weight (g) Final vol. (mL) [Cd] digest (mg/L)

blank digest - 50.0 0.3

1 17.50 50.0 1.76

2 14.58 50.0 1.90

3 15.36 50.0 1.87

4 17.56 50.0 1.71

5 18.96 50.0 1.89

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Answer 1

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