Looks like it takes into account water quality and hydrographic measurements, DO, pH, various metals, turbidity, and salinity.

Is this the index you're referring to? The paper contains a scale for interpretation, and methods of calculating it.

Wepener, et al. 1992. The development of an aquatic toxicity index as a tool in the operational management of water quality in the Olifants River (Kruger National Park). KOEDOE 35(2).

yes, i am referring of this index. but how these parameters are related so that it is obtained. I go through the Wepener et al. 1992, but is it just valid for kruger national park or can i take it as standard for all water bodies? Is this index will vary for every water body since it depents on water quality parameters.

I would say that any simplified indexes about aquatic toxicity are invalid because of the hyge rsnge of differences between organisms

. Manusadžianas L., Sadauskas K., Vitkus R. 2010. Comparative study of indices used in toxicity evaluation of effluents. – Desalination, 250(1):383–389.

Thanks, It is not downloaded. Would you please attach this to me after downloading.

thanks

Toxicity index values are calculated as the concentration of the compound in

the sample divided by the EC50 or LC50 of an aquatic organism.

Simply put, to calculate the Toxicity index values the concentration of the compound in

the aquatic sample is divided by the EC50 or LC50 of a reference aquatic organism either vertebrate (fish) or invertebrate (plankton)

Thanks to all