Registration Dossier
Registration Dossier
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EC number: 236-921-1 | CAS number: 13548-38-4
Endpoint summary
Administrative data
Description of key information
Additional information
The concept of biodegradation is not applicable to inorganic substances such as chromium trinitrate. Thus, testing for biodegradation in water, sediment and soil is waived.
In a study conducted in 1968 about 200 November-harvested oysters were placed in each of eight 120-liter tanks making use of a flow-through sewer water system. During the acclimatisation and experimental periods the sea water was maintained at a flow rate of 2.5 l/min and a 20± 1 degree C temperature with salinity variable but usually 31 ± 2 ppt. The test animals were subjected to continuous levels of the test substance at 0.05 ppm and 0.1 ppm. Each week the test animals were removed for analysis.
The test result indicated the metal in the tissues of the test animals ranged from less than 0.21 ppm to 6.28 ppm at 0.05 ppm concentration group and ranged from less than 0.21 ppm to 11.49 ppm at 0.1 ppm concentration group.
The BCF for the test substance was not specified in this study. However, it was indicated to be 116 as reported in the AMBIENT WATER QUALITY CRITERIA FOR CHROMIUM published by U.S. ENVIRONMENTAL PROTECTION AGENCY.
Accumulation and elimination of chromium of the earthworm Eisenia andrei was determined in an artificial soil, exposed to chromium trintrate. Five concentration groups of 10, 32, 100, 320 and 1000 mg/kg dw soil and control group were administrated to the test earth worms. Chromium was significantly accumulated and earthworm reproduction significantly reduced at soil concentrations of 100 mg/kg and higher. Chromium was completely eliminated and reproduction no longer affected at the end of a 3-week recovery period. BCF values for the accumulation of chromium in the worms were 0.031-0.047 at the three lowest and 0.016-0.019 at the two highest dose levels. Control soil contained 6.3 mg Cr/kg dry weight; the BCF value for worms kept in this soil therefore is 0.048.
In summary it can be stated that chromium (III) does not significantly bioaccumulate in American oysters and does not bioaccumulate in earthworms.
Chromium trinitrate is expected to have a low potential for adsorption, as it is an inorganic salt, fully dissociated in aqueous media and thus having virtually no potential for adsorption to soil or sediment. Thus, this endpoint is waived. For the purpose of risk assessment a value of 1 is used.
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