Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:7:p2
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 7 (pt 2/2)
Character Range: 1526191–1527922

reference soil were then used to calculate ACL(NOEC & EC10) values for a range of soils (that is, soil-specific ACL(NOEC & EC10)) for each group of organisms using the same normalisation relationships as before but in the reverse manner. The following explains how the soil-specific ACL(NOEC & EC10) values for soils with an urban residential /public open space land use were calculated as an example of how this was done for each of the land uses.

Soil-specific ACL(NOEC & EC10) values for soil processes varied with soil pH and ranged from 20 to 330 mg/kg added Zn for soils with pHs between 4 and 7.5 (Table 7). The soil-specific ACL(NOEC & EC10) values for invertebrates (Table 8) varied with cation exchange capacity (CEC), with values ranging from 60 to 420 mg/kg for soils with CEC values ranging from 5 to 60 cmolc/kg. Soil-specific ACL(NOEC & EC10) values for plants (Table 9) were pH- and CEC- specific and ranged from 20 to 910 mg/kg for soils with pHs between 4 and 7.5 and CEC values between 5 and 60 cmolc/kg.

Table 7. Soil-specific ACL values for zinc (Zn) based on no observed effect concentration and 10% effect concentration toxicity data that should theoretically protect 80% of soil processes in soils with pH values ranging from 4.0 to 7.5.
Soil pH  Zn ACL (mg/kg)
         for soil processes
4.0      20
4.5      30
5.0      45
5.5      70
6.0      100
6.5      150
7.0      220
7.5      330

Table 8. Soil-specific ACL values for zinc (Zn) based on no observed effect concentration and 10% effect concentration toxicity data that should theoretically protect 80% of invertebrate species in soils with CEC ranging from 5 to 60 cmolc/kg.
Cation exchange capacity (cmolc/kg)  Zn ACL (mg/kg) for invertebrates