Resumo

RAMIREZ-GONZALEZ, Surey et al. Quantification of nitrate contents in waters and wastewater with the use of selective electrodes. Rev Cub Quim [online]. 2018, vol.30, n.1, pp. 131-142. ISSN 2224-5421.

The partial validation of the potentiometric method was conducted by means of selective electrodes for the nitrate contents quantification in samples of groundwater and wastewaters. First, the performance parameters were evaluated: linearity, sensitivity, limit of detection (LD), limit of quantification (LC), precision and matrix effect. A linear range was obtained from 0,5 to 100 mg/L of nitrate, detection limit of 0,367 mg/L and the quantification of 1,224 mg/L. The coefficient of variation is below two, which is considerably lower at nitrate concentrations above 30 mg/L. A comparison was also made between the established calibration curve and the standard addition method, displaying the matrix effect. The determination of nitrate was performed in samples of drinking water and wastewater, and did not comply with Cuban water and wastewater standards.

Palavras-chave : nitrate; water supply; wastewaters; selective electrode; validation.

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