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  3. 8. the following data are for a series of external

8. The following data are for a series of external standards of Cd2+ buffered to a...

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Basic Math

8. The following data are for a series of external standards ofCd2+ buffered to a pH of 4.6.14

[Cd2+] (nM) 15.4 30.4 44.9 59.0 72.7 86.0

Sspike (nA)    4.8 11.4 18.2   26.6    32.3    37.7

(a) Use a linear regression analysis to determine the equationfor the calibration curve and report confidence intervals for theslope and the y-intercept.

(b) Construct a plot of the residuals and comment on theirsignificance.

At a pH of 3.7 the following data were recorded for the same setof external standards.

[Cd2+] (nM) 15.4 30.4 44.9 59.0 72.7 86.0

Sspike (nA) 15.0    42.7 58.5 77.0 101   118

(c) How much more or less sensitive is this method at the lowerpH?

(d) A single sample is buffered to a pH of 3.7 and analyzed forcadmium, yielding a signal of 66.3 nA. Report the concentration ofCd2+ in the sample and its 95% confidenceinterval.

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