Question

2) At a pH of 3.7, the following data were recorded for a series of Cd2+ standards: Cd2+1 (nM) 15.4 30.4 44.9 59.0 72.7 86.0 Signal (nA) 15.0 42.7 58.5 77.0 101 118 A single sample buffered to a pH of 3.7 yields a signal of 66.3. Determine the cadmium concentration in the sample.

Answer 1

The data table to blot coneentration vs signal, [Cd2+16M) Signal (na) 15.4 15.6 30.4 42,7 44,9 5815 7710 59,0 72,7 Signed for unknown samble = 663 101 86,0 118 The calibration curve is shron below,

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The corresponding concentration of the signal at 66, 3n A is, 500M. (The coresponding line are shown as dottedline on calibration curve, .: The [code] in the sample = 50nm,