Thermal Infrared Enthalpimetry Method for the Determination of Hypochlorite in Bleaching Solutions

AUTOR(ES)

Nora, Flavia M. Dalla; Oliveira, Alessandra S.; Duarte, Fabio A.; Cichoski, Alexandre J.; Barin, Juliano S.

FONTE

Journal of the Brazilian Chemical Society

DATA DE PUBLICAÇÃO

2022

RESUMO

Thermal infrared enthalpimetry (TIE) was used for hypochlorite determination in commercial hypochlorite-based bleaching solutions. Experimental parameters were evaluated for the reaction with a hydrogen peroxide solution. The most relevant conditions were 5% H2O2 (m/m) solution, stirring speed of 250 rpm, dispensing rate of 0.57 mL s-1, and 10 s after reaction for the simultaneous temperature readings of four replicates. Agreement to reference method NBR 9425 ranging from 98.2 to 103.2% was achieved, with a low variation among measurements (relative standard deviation < 3.5%). The number of analytical operations was reduced, and only H2O2 solution was required as a greener reagent. A low amount of residues was generated (2.4 and 152.8 mL for each replicate in TIE and official method, respectively), and the application of the green analytical procedure index (GAPI) showed the greenness of the proposed method.

Documentos Relacionados

• Thermal Infrared Enthalpimetry in Paper Microzone Plates for Green and High Throughput Determination of Wine Acidities
• A Novel Thermal Infrared Enthalpimetric Method for Fast, High-Throughput Determination of the Content Uniformity of Captopril Tablets
• A facile spectrophotometric method for the determination of hypochlorite using rhodamine B
• A METHOD FOR THE DETERMINATION OF THE THERMAL RESISTANCE OF BACTERIAL SPORES
• Infrared dichroism of the DNA-caffeine complex. A new method for determination of the ligand orientation.