The Tame-Water laboratory offers a service for the analysis of metals in water, sludge and sediments using specific bacterial probes. With Biometox, the Tame-Water laboratory is able to semi-quantify the concentration of 4 metals:
Benefits of Biometox Solution
Using an approach combining a battery of bioprobes with differential sensitivities and neural network processing, the levels of five metals (copper, lead, zinc, arsenic and mercury) are semi-quantified simultaneously according to concentration ranges.
Focus on the actual bioavailability of metals
Tame-Water's bioassays focus on the bioavailable forms of metals and their potential interaction(s) in solution.
For metals, it is difficult to correlate concentration thresholds with significant thresholds of potential impacts for several reasons:
- Metallic elements exist naturally in the environment, so it is essential to distinguish between naturally occurring and man-made contributions;
- Living organisms need specific metals and some are even adapted to live in particularly rich environments;
- metals are present in water as free ions, but they can be transformed with organic and inorganic elements;
- only certain forms of the metal can be assimilated and have an effect on organisms: these are the bioavailable forms.
All of these particularities mean that the analysis of metals by Tame-Water and the assessment of the risks associated with their presence is a complementary approach to that carried out by conventional physico-chemical analyses in the regulatory framework. Tame-Water is thus able to assess the actual toxicity caused by metals.
Calculation of the Metox index
To complete these innovative biological approaches, Tame-Water measures the Metox index according to the TEF Metox 1975 JO 92 method. This index, defined by the Water Agencies, makes it possible to establish a toxicity threshold linked to the presence of metals in a given aquatic environment.
It is calculated by adding the quantities of each particular toxic metal affected by a multiplier coefficient reflecting the toxicity of the metal.
The Tame-Water laboratory teams rely on their recognized expertise in bioassays to analyse metals and their actual toxicity.
With biometox analysis, Tame-water focuses mainly on bioavailable forms, which are the only forms of the metal that can be assimilated and induce an effect on organisms.