ISO 7027-2:2019 PDF

Water quality — Determination of turbidity — Part 2: Semi-quantitative methods for the assessment of transparency of waters

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Title (English):

ISO 7027-2:2019

Water quality — Determination of turbidity — Part 2: Semi-quantitative methods for the assessment of transparency of waters

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 12
Publication date:: January 18, 2019
Edition:: ISO IS 7027 edition 1 version 1
ICS:: 13.060.60

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Description (English):

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), see Clause 4; 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), see 5.1; c) measurement of visibility by divers in a destined depth, see 5.2. NOTE The quantitative methods using optical turbidimeters or nephelometers are described in ISO 7027-1.

Technical details

Technical committee: ISO/TC 147/SC 2 - Physical, chemical and biochemical methods
SKU: ISO 7027-2:2019

Abstract

Overview

ISO 7027-2:2019 - "Water quality - Determination of turbidity - Part 2" specifies semi-quantitative methods to assess water transparency (visibility) in laboratory and field settings. It complements ISO 7027-1 (quantitative methods using optical turbidimeters or nephelometers) by describing accessible, indicative techniques used for transparent to slightly cloudy waters and surface monitoring.

Key semi-quantitative methods covered:

Transparency testing tube (laboratory; Clause 4)
Transparency testing disc / Secchi disc (in situ surface and marine monitoring; Clause 5.2)
Diver visibility measurement (visibility at depth; Clause 5.3)

The standard includes apparatus specifications, sampling and handling guidance, test procedures, expression of results and reporting requirements.

Key topics and technical requirements

Apparatus specifications
- Transparency testing tube: colourless glass, 600 mm ± 10 mm length, internal diameter 25 mm ± 1 mm, graduations 10 mm (Clause 4.2.1).
- Print sample and constant light source (low-voltage tungsten lamp ~3 W) for tube method.
- Transparency testing disc: matt white, weighted to sink; recommended diameters - 20 cm for inland waters, 30 cm for marine waters (Clause 5.2.1).
- Measuring tape/rope with cm marks and optional view-scopes or poles for currents.
Sampling and sample handling
- Clean bottles filled bubble-free; if stored, keep at 10 ± 5 °C and measure within 24 hours. Allow samples to return to room temperature before testing (Clause 4.2.2).
Procedures
- Tube: fill tube, lower liquid level until test mark is clearly visible from above; read depth to nearest 10 mm (Clause 4.2.3–4).
- Disc (Secchi): lower disc slowly; record mean of disappearance and reappearance depths; avoid direct sunlight and reflections; best between 10:00–14:00 (Clause 5.2.2).
- Diver visibility: procedure and expression of results detailed for in-water assessments (Clause 5.3).
Influencing factors

Overview

Key semi-quantitative methods covered:

Transparency testing tube (laboratory; Clause 4)
Transparency testing disc / Secchi disc (in situ surface and marine monitoring; Clause 5.2)
Diver visibility measurement (visibility at depth; Clause 5.3)

The standard includes apparatus specifications, sampling and handling guidance, test procedures, expression of results and reporting requirements.

Key topics and technical requirements

Apparatus specifications
- Transparency testing tube: colourless glass, 600 mm ± 10 mm length, internal diameter 25 mm ± 1 mm, graduations 10 mm (Clause 4.2.1).
- Print sample and constant light source (low-voltage tungsten lamp ~3 W) for tube method.
- Transparency testing disc: matt white, weighted to sink; recommended diameters - 20 cm for inland waters, 30 cm for marine waters (Clause 5.2.1).
- Measuring tape/rope with cm marks and optional view-scopes or poles for currents.
Sampling and sample handling
- Clean bottles filled bubble-free; if stored, keep at 10 ± 5 °C and measure within 24 hours. Allow samples to return to room temperature before testing (Clause 4.2.2).
Procedures
- Tube: fill tube, lower liquid level until test mark is clearly visible from above; read depth to nearest 10 mm (Clause 4.2.3–4).
- Disc (Secchi): lower disc slowly; record mean of disappearance and reappearance depths; avoid direct sunlight and reflections; best between 10:00–14:00 (Clause 5.2.2).
- Diver visibility: procedure and expression of results detailed for in-water assessments (Clause 5.3).
Influencing factors

ISO 7027-2:2019 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Abstract

Overview

Key topics and technical requirements

Applications and users

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