A well-used nitrate ISE was being used to test some ground water samples for possible leaching from a hazardous waste site. A percent recovery procedure was performed to decide whether a standard calibration curve could be used for determining the concentration of nitrate in the ground water samples. All standards and samples were treated with \(10 \mathrm{ml}\) TISAB \((1 \mathrm{M} \mathrm{NaCl})\) per \(100 \mathrm{ml}\) of test solution and stirred thoroughly just before measurement. In addition to the ground water sample, a spiked sample and a spiked duplicate sample were used. In each of the spiked samples, \(1.00 \mathrm{ml}\) of a \(1.00 \times 10^{-2} \mathrm{M}\) standard \(\mathrm{NaNO}_{3}\) solution was added to \(100 \mathrm{ml}\) of the sample. The calibration curve was linear and fit the equation:

\[E_{\text {cell }}=0.265-(0.0574) \log \left(a_{\mathrm{NO}_{3}^{-}}ight)\]

The sample, spiked sample, and spiked duplicate sample gave cell potentials of \(0.473_{8}, 0.464_{6}\), and \(0.464_{2}\), respectively. Calculate the percent recovery and the percent discrepancy (between the spiked and spiked duplicate samples).