Avaliação de filtros domésticos comerciais para purificação de águas e retenção de contaminantes inorgânicos

• Autor(a) principal: Pedro,Nilva Aparecida Ressinetti
• Data de Publicação: 1997
• Outros Autores: Brígido,Berenice Mandel, Badolato,Maria Irene Cibela, Antunes,José Leopoldo Ferreira, Oliveira,Elisabeth de
• Tipo de documento: Relatório
• Idioma: por
• Título da fonte: Química Nova (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421997000200014
• topic: water; domestic filters; activated carbon

Twenty domestic commercial filters, in order to determine the percentual retention of color, turbidity, dry residue, bicarbonates, carbonates, total hardness, nitrogens, iron, chlorides, fluorides, and residual chlorine (parameters of food legislation) and sulphides in thirteen water samples proceeding from springs, wells, rivers, lakes, drinking patterns and standards, before and after purification were evaluated. The results showed that purifiers presented adequate retention for nitrates (74.8 ± 16.2 %) and residual chlorine (74.0 ± 11.2) and medium retention for sulphides (61.7 ± 11.3); while porcelain plus activated carbon filters presented adequate retention for color (90.0 ± 19.7), turbidity (76.4 ± 18.4) and iron (83.5 ± 15.1). Therefore the retention of carbonates, bicarbonates, total hardness, chlorides, dry residue, fluorides, ammonium nitrogens and nitrites was less than 10%, and the values of pH didn't show significant variation, for all the filters studied.