The linear response range, limits of detection and quantification,precision, accuracy, analytical frequency, enrichment factor and consumption index were assessed as validation parameters, as presented in Tables 2 and 3. The calibration standards were performed by matrix matching, employing a pool of 15 human serum samples spiked with Pb2þ from 7.00 to 260.0 mg L1. The analytical signals are shown in Fig. 7. The obtained limit of quantification was lower than the reference value for Pb2þ in serum samples (32.5 mg L1 [24]), being an adequate method for this application. The intra and inter-day precision presented RSD values always lower than 8.1%. The accuracy was checked through the addition of
recovery tests (Table 3), and the recoveries ranged from 89.4% to 107.3%. As it can be found in literature [24–28], only high interferent concentrations can compromise the Pb2þ adsorption on the CNTs. Thus, the low level of concomitant ions found in the human blood serum does not cause any detectable effect in the Pb2þ response.
The linear response range, limits of detection and quantification,precision, accuracy, analytical frequency, enrichment factor and consumption index were assessed as validation parameters, as presented in Tables 2 and 3. The calibration standards were performed by matrix matching, employing a pool of 15 human serum samples spiked with Pb2þ from 7.00 to 260.0 mg L1. The analytical signals are shown in Fig. 7. The obtained limit of quantification was lower than the reference value for Pb2þ in serum samples (32.5 mg L1 [24]), being an adequate method for this application. The intra and inter-day precision presented RSD values always lower than 8.1%. The accuracy was checked through the addition ofrecovery tests (Table 3), and the recoveries ranged from 89.4% to 107.3%. As it can be found in literature [24–28], only high interferent concentrations can compromise the Pb2þ adsorption on the CNTs. Thus, the low level of concomitant ions found in the human blood serum does not cause any detectable effect in the Pb2þ response.
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