Chromium - The Risk Assessment Information System
Chromium - The Risk Assessment Information System
Chromium - The Risk Assessment Information System
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Surrogate<br />
Receptor Group<br />
Avian herbivore<br />
(dove)<br />
Avian ground<br />
insectivore<br />
(woodcock)<br />
Avian carnivore<br />
(hawk)<br />
Table 5.2 Calculation of the Avian Eco-SSLs for Trivalent <strong>Chromium</strong><br />
TRV for Trivalent<br />
<strong>Chromium</strong><br />
(mg dw/kg bw/d) 1<br />
Food Ingestion<br />
Rate (FIR) 2<br />
(kg dw/kg<br />
bw/d)<br />
Soil Ingestion<br />
as Proportion<br />
of Diet (P s) 2<br />
2.66 0.190 0.139<br />
2.66 0.214 0.164<br />
2.66 0.0353 0.057<br />
Concentration of<br />
<strong>Chromium</strong> in Biota<br />
Type (i) 2,3<br />
(B i)<br />
(mg/kg dw)<br />
B i = 0.041 * Soil j<br />
where i = plants<br />
B i = 0.306 * Soil j<br />
where i = earthworms<br />
ln(B i) = 0.7338 *<br />
ln(Soil j) - 1.4599<br />
where i = mammals<br />
Eco-SSL<br />
(mg/kg dw) 4<br />
1 <strong>The</strong> process for derivation of wildlife TRVs is described in Attachment 4-5 of U.S. EPA (2003).<br />
2 Parameters (FIR, Ps, Bi values, regressions) are provided in U.S. EPA (2003) Attachment 4-1 (revised February 2005).<br />
3<br />
Bi = Concentration in biota type (i) which represents 100% of the diet for the respective receptor.<br />
4 HQ = FIR * (Soilj * Ps + Bi) / TRV) solved for HQ=1 where Soilj = Eco-SSL (Equation 4-2; U.S. EPA, 2003).<br />
NA = Not Applicable<br />
Eco-SSL for <strong>Chromium</strong> 9<br />
April 2008<br />
78<br />
26<br />
780
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