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O que é Dureza geral (GH)?
Também conhecida como dureza permanente, esta é principalmente a medida da concentração global de íons de cálcio (Ca++) e magnésio (Mg++) na água. Outros íons podem contribuir para o GH, mas estes geralmente são bastante insignificantes. Quanto mais dura a água, maior o GH. Muitas vezes é expresso como graus de dureza (dH) ou partes por milhão de carbonato de cálcio (CaCO3). Um dH é o equivalente a aproximadamente 17,9 ppm de CaCO3. A dureza da água geralmente segue estas diretrizes: 0-4o dH (0-70ppm) = muito macio, 4-8o dH (70-140ppm) = macio, 8-12o dH (140-210ppm) = médio, 12-18o dH (210 -320ppm) = bastante duro, e 18-30o dH (320-530ppm) = duro-muito duro.
Sinônimos
Dureza permanente, Dureza
Nome de termo em inglês
General hardness (GH)