Estudo da metodologia de análise de hipoclorito de sódio na indústria de saneantes

Abstract

The objective of this work was to study the sodium hypochlorite raw material with respect to its possible methodologies of analysis, aiming to establish the most viable in terms of reagent costs and time reduction for the industry in which the curricular stage was carried out, tQuímica Brasil. In addition, a study was made of the factors that affect the decomposition of sodium hypochlorite, considering possible measures of improvements that may be adequate to the quality control of the company. The household cleaning industry seeks to offer compliance and safety in the products offered, being controlled by several inspection agencies, such as the National Sanitary Surveillance Agency, which establishes parameters and guidelines for analysis, operating standards, good manufacturing practices, among others. As regards sodium hypochlorite products, the regulations are very specific, indicating maximum and minimum values for the marketing of the products, so the care and guidelines related to this raw material must be established and followed strictly, bringing to the fore the need for specific studies and directed according to the particularities of each industry. The analyzes and follow-up studies were based on oxidation-reduction volumetry, and the data were obtained by titration with sodium thiosulphate. The most suitable methodology for the industry was the 10% dilution of the hypochlorite sample considering the rest time before titration. In the case of the hypochlorite instability follow-up study, it was carried out on consecutive days, and it was possible to obtain data confirming that temperature is a critical factor, advising milder temperatures in hypochlorite storage as well as the decomposition of hypochlorite be more accentuated at higher initial concentrations. In this way, it was possible to establish some measures of reduction and correction of the critical factors in the decomposition of the raw material.