Antes mesmo de saber o número da Portaria e país de origem (BR, PT, ???), a Ms. Curiosidade-Comparativa acabou chegando no link abaixo.
Of course nao tenho certeza se o "meu" texto em português é exatamente o "seu" -- estarei eu direcionada à fonte certa, ou Saara à vista?!...

bom trabalho,
beatriz.

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http://standards.nsf.org/apps/group_public/search_view.php?d...

"This document is part of the NSF International standard development process. This document is subject to change and may be a draft and/or non-final version. Committee members may reproduce, quote from, and/or circulate this document to persons or entities outside of their organization after first providing NSF International with written notice of to whom and for what purpose this document is to be shared. FOR INFORMATIONAL PURPOSES ONLY."
"NSF/ANSI Standard for Drinking Water Treatment Units"

(...)

água de desafio - Água preparada a partir da água de exposição, contendo os indicadores para cada um dos ensaios a serem realizados.

"3.192.1 challenge water= The water used to test the performance of a component, system, or process. The mixture of water and contaminants presented to the system for purposes of used to testing the a system for contaminant reduction claims made under this Standard."


água de exposição - Água de accordo com Portaria No. xxx do Ministério da Saúde.
"3.192.5 exposure water= Water having definitive characteristics prior to contact with a system or component(s) in extraction procedures."

água de ensaio microbiológico - Água potável, sem xxx ou yyy, doravante denominada água de ensaio.
"3.192.8 microbiologically safe water = Drinking water deemed acceptable for human consumption by an appropriate a health or regulatory agency having jurisdiction."

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