Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:10:p2
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 10 (pt 2/4)
Character Range: 1746692–1750312

simply total Cr.

Extensive searches of the available scientific literature were conducted on ISI web of knowledge, the US EPA ECOTOX database (http://cfpub.epa.gov/ecotox), the Dutch RIVM e-toxbase database (http://www.e-toxbase.com – this is not publicly available), the database of the French National Institute of Industrial Environment and Risk (INERIS, www.ineris.fr), and the Australasian Ecotoxicology Database (Warne et al. 1998; Warne & Westbury 1999; Markich et al. 2002; Langdon et al. 2009). There were a number of publications (Bonet et al. 1991; Scoccianti et al. 2006) which presented toxicity data for Cr (III) that were not included in the derivation of SQGs in this guideline. This was because these were based on exposing plants solely via aqueous media (that is, hydroponics) or the growth medium was agar and this is vastly different from exposure via soil.

The raw toxicity data for Cr (III) is presented in Appendix I. The toxicity data (geometric means for each species) used to calculate the SQGs is presented in Table 83. There was toxicity data for a total of 21 species or soil microbial processes. There was data for 2 soil invertebrate species, 12 species of plants and 7 soil microbial processes. This data meets the minimum data requirements recommended in Schedule B5b to use the BurrliOZ SSD method (Campbell et al. 2000). The toxicity data for nitrogenase was not used as it was all 'less than' values and the lowest concentration tested (that is, 50 mg/kg) caused an effect considerably larger than 50%. It should be noted that the toxicity data for the enzyme catalase was markedly lower (that is, more than one order of magnitude) than all the other toxicity data. Given this and the fact that the toxicity data was quantified using nominal (not measured) concentrations, there is uncertainty in the reliability of this data. Therefore the catalase toxicity data was not used to derive the SQGs.
Table 83. The lowest geometric mean values of normalised (invertebrate) and non-normalised (all other species and microbial processes) trivalent chromium (Cr (III)) toxicity data, expressed in terms of added Cr (III) for soil invertebrate species, plant species, and soil microbial processes.
Test species                 Geometric mean (mg/kg)
Common name                  Scientific name         EC10 or NOEC  EC30 or LOEC  EC50
Arylsulfatase                                        121           181           321
Barley                       H. vulgare              200           300           600
Beans                                                200           500           600
Bent grass                   Agrostis tenius         3333          5000          10000
Bush bean                    Phaseolus vulgaris      41            70.7          141
Catalase                                             0.19          0.88          2.32
Corn                         Z. mays                 294           611           1233
Earthworm                    Eisenia fetida          467           700           1400
Earthworm                    E. Andrei               25.4          79.5          159
Glutamic acid decomposition                          55            400           800
Grass                                                200           500           600
Indian mustard               Brassica juncea         500           750           1100
Lettuce                      L. sativa               500           387           775
Nitrogenase                                          <<50          <<50          <<50
Nitrogen mineralisation                              172