1. Theory. Reminders

1.1 Interaction between a light beam and a particle

Measuring turbidity in a liquid is based on the principle of interaction between an incident light wave and a suspended particle, which mainly involves scattering, reflection, absorption, refraction, etc., as illustrated in figure 1 .

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Theory. Reminders

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page Turbidity measurement

Measuring principle

Bibliography

References

(1) - Guide de choix des turbidimètres en continu - EXERA S 3796 X 03.
(2) - Recueil international des méthodes d'analyse - OIV-MA-F-SA2-08 – Turbid (Organisation internationale de la vigne et du vin).

Glossary

Turbidity: the reduction in transparency of a liquid due to the presence of undissolved matter (NF EN ISO 7027 standard).

The definitions below are taken from FD ISO GUIDE 30.

Reference material (RM): material or substance for which one or more property values are sufficiently homogeneous and well defined to enable it to...

Regulations

Ministerial Order of February 2, 1998, published in the Journal Officiel of March 3, 1998

* Section III – Surface water pollution

Article 31

For receiving waters to which the provisions of Decree no. 91-1283 of December 19, 1991 apply, the effects of discharge must comply with the following provisions: no increase of more than 30% in suspended solids.

...

Standardization

Water quality – Turbidity determination. - NF EN ISO 7027 - (mars 2000)
Qualité de l'eau. Échantillonnage. Partie 1 : lignes directrices pour la conception des programmes et des techniques d'échantillonnage. - NF EN ISO 5667-1 - 2007
Qualité de l'eau. Échantillonnage. Partie 3 : lignes directrices pour la conservation et la manipulation des échantillons d'eau. - NF EN ISO 5667-3 - 2004
Qualité de l'eau....