Biotesting of Decabromodiphenyl Oxide Using a Multicomponent Test System

The results of biotesting of decabromodiphenyl oxide using a multicomponent test system are presented. It has been demonstrated that its aqueous solutions exhibit a reverse dose-dependent effect in stimulating the growth of colonies of the green algae Chlorella vulgaris and show no signs of toxic effects on Daphnia magna. During the thermal decomposition of decabromodiphenyl oxide at a temperature of 400°C, a mixture of products is formed, one of which is bromine. The decomposition product is released into the air and possesses toxic properties, as evidenced by stimulation of the growth of colonies of the green algae Chlorella vulgaris, as well as the death and growth abnormalities of Planorbis mollusk embryos. Therefore, water samples containing decabromodiphenyl oxide can be assessed for toxicity by biotesting methods, using cultures of green algae Chlorella vulgaris and 24-hour-old Planorbis embryos as test subjects. It is noteworthy that, in the context of the prevailing perception of the safety of decabromodiphenyl oxide, based on its poor water solubility and low toxicity to biological organisms, there arises a need to study embryotoxic effects of the thermal decomposition products on both animals and humans.