Only the samples with vegetable based baby food matrix were used for the spiked recovery analysis. Known concentrations of the nitrate solutions (5, 10 and 20 lg mL1) were added as an internal standard to the extracted samples.
Only the samples with vegetable based baby food matrixwere used for the spiked recovery analysis. Known concentrationsof the nitrate solutions (5, 10 and 20 lg mL1) were added as aninternal standard to the extracted samples.