No substances data is available for years 1977 1979.
If relevant substance data are lacking, the gaps in the data must be eliminated – if necessary, via suitable laboratory tests or model calculations.
Hence, if the single substance data are of sufficient quality for the respective single substance risk assessment, no special consideration is needed for a mixture toxicity assessment using CA. CA links the toxicity of individual substance to their joint action.
A high number of substances and corresponding substance data were imported into the system by using the provided standard MS-Excel interface of KnowSEC.
However, for current substances, little data are published about intoxications and their plasma concentrations.
The concept implicitly assumes that all single substance toxicity data are recorded for the same species, in the same bioassay and using the same endpoint.
For unprioritized phase-in substances, no further data are required, and in particular no toxicity testing is required.
For eleven of these substances, sufficient data were available to characterise their risk, these were: oxytetracycline, chlortetracycline, tetracycline, sulphadiazine, amoxicillin, diazinon, tylosin, dihydrostreptomycin, apramycin, cypermethrin and sarafloxicin.
Now four WHO researchers have estimated the global burden of certain toxic substances for which adequate data are available.
Food web models have not been evaluated for reliability for all chemical classes (i.e., ionizing substances) because field bioaccumulation data are generally not available.
