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Estou sempre a ler sobre a condutância da água. O que é?

Através da condutância é possível a avaliação da quantidade de iões dissolvidos presentes na água. Estes iões conseguem conduzir electricidade, daí a expressão condutância. Em água doce é indicada em µS/cm. Quanto mais iões dissolvidos estiverem na água, tanto maior é a condutância. Águas mais duras têm uma condutância mais elevada que água macia. 30 µS/cm correspondem aproximadamente a 1º de dureza carbonata, isto é, sendo a dureza carbonata de 10, a condutância sobe acima de 300 µS/cm. Na água do aquário o valor deve situar-se entre 250 e 900 µS/cm.

Tanto um valor inferior como superior criam geralmente problemas para os peixes e para as plantas aquáticas. Se adicionar à água do aquário sal ou medicamentos, a condutância aumenta. A condutância só pode ser medida com um aparelho específico, bastante caro. Institutos técnicos ou boas lojas da especialidade possuem tais aparelhos. Peça-lhes a determinação da condutância se pretende criar espécies sensíveis, para as quais é necessário que os valores da água sejam exactamente os necessários.

Se gostou de O que é a condutância da água? partilhe no Facebook e Twitter!


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