ÖNORM EN ISO 7027-2: 2019 06 15
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Water quality — Determination of turbidity — Part 2: Semi-quantitative methods for the assessment of transparency of waters (ISO 7027-2:2019)
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06-15-2019
This document specifies the following semi-quantitative methods for the assessment of transparency of waters: a) measurement of visual range using the transparency testing tube (applicable to transparent and slightly cloudy water), b) measurement of visual range in the upper water layers using the transparency testing disc (especially applicable to surface, bathing water, waste water and often used in marine monitoring), c) measurement of visibility by divers in a destined depth.
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