Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:5
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 5
Character Range: 1722265–1723370

5                                    10                                      20  30   40   60
Areas of ecological significance     1                                       6   9    10   15   20
Residential urban/public open space  10                                      50  80   110  130  170
Commercial/industrial                20                                      95  150  200  240  310

a = all CEC measurements were made using the silver thiourea method (Chhabra et al. 1975).

9.6.1.2         Calculation of ambient background concentration values
For sites with no history of Ni contamination, the method of Hamon et al. (2004) is recommended in Schedule B5b to estimate the ABC. The equation to predict the ABC for Ni is

log Ni conc (mg/kg) = 0.702 log Fe content (%) + 0.834              (equation 10)

Examples of the ABC values predicted by this equation are presented in Table 76.

Table 76. ABCs for nickel (Ni) predicted using the equation from method of Hamon et al. (2004) (equation 10 above).
Fe content (%)  Predicted ABC
                (mg/kg)
0.1             1
0.5             4