Produção De Material De Referência Certificado De Óxido De Hólmio(iii) Em Ampolas

Abstract

PRODUCTION OF CERTIFIED REFERENCE MATERIAL OF HOLMIUM(III) OXIDE IN AMPOULES. This work reports the development of a certified reference material (CRM) of holmium(III) oxide Ho 2 O 3 in acidic solution for the wavelength scale calibration of UV-Vis spectrophotometers. A 4.0% Ho 2 O 3 solution was gravimetrically prepared in 10% perchloric acid and bottled in 5.0 mL glass ampoules. Homogeneity, stability and characterization were assessed according to ISO 17034 and ISO Guide 35. The material certification was undertaken by two laboratories by using UV-Vis spectrophotometry for characterization of the 14 peaks of minimum transmittance of Ho 2 O 3 , using a spectral bandwidth of 1.00 nm and a scanning speed of 30.0 nm min-1. The material property values in wavelength (nm) were obtained for these 14 peaks, together with the expanded uncertainty (U) of 0.12 nm, for a coverage factor (k = 2.00) corresponding to a probability of approximately 95%, which took into account the standard uncertainties obtained in each study performed for the certification of the produced reference material.

Isolation and characterization of reference standard candidates for cocaine and benzoylecgonine obtained from illicit substances seized

“…For a batch to be considered homogeneous, the critical F value should be greater than the calculated F value, and the p ‐value should be greater than 0.05 (95% probability) [30]. The calculated F value was 0.1820, and the p ‐value was 0.9959, indicating a high similarity.…”