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Air Quality Criteria for Lead Volume II of II - (NEPIS)(EPA) - US ...

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Table AX7-1.3.6. Invertebrate Toxicity Data Not Used to Develop the Eco-SSL<br />

Invertebrate Species Soil pH<br />

% Organic<br />

Matter<br />

AX7-84<br />

Toxicity<br />

Parameter<br />

Pb in Soil<br />

(mg/kg dw)<br />

Nematode 4 1.14 LC50 285<br />

Nematode 4 1.14 LC50 297<br />

Nematode 4 4.2 LC50 847<br />

Nematode 4 4.2 LC50 1341<br />

Nematode 6.2 1.7 LC50 1554<br />

Nematode 5.1 3.0 LC50 891<br />

Earthworm 6.3 10.0 EC50 1940<br />

Earthworm 6.1 10.0 EC50 1629<br />

Earthworm 6.0 10.0 LC50 3716<br />

Earthworm 6.5 10.0 ILL 1.16<br />

Nematode 4 10 LC50 1434<br />

Nematode 4 10 NOAEC 2235<br />

Nematode 6.1 3.4 LC50 13.9<br />

Nematode 6.2 2.2 LC50 11.6<br />

*NOAEC (no-observed-adverse-effect concentration); LC50 (concentration lethal to 50% <strong>of</strong> test population);<br />

EC50 (effect concentration <strong>for</strong> 50% <strong>of</strong> test population); ILL (incipient lethal level).<br />

Source: U.S. Environmental Protection Agency (2005b).<br />

non-percolated or percolated soil, respectively). However, percolation did have a significant<br />

effect on Pb-nitrate toxicity (LC50 = 980 mg/kg or 2200 mg/kg <strong>for</strong> non-percolated or percolated<br />

soil, respectively; EC50 <strong>for</strong> reproduction = 580 mg/kg or 1700 mg/kg <strong>for</strong> non-percolated or<br />

percolated soil, respectively). <strong>Lead</strong> nitrate was more toxic than Pb-chloride <strong>for</strong> survival and<br />

reproduction. However, the toxicity <strong>of</strong> Pb, from chloride or nitrate, was not significantly<br />

different after the counterion was percolated out <strong>of</strong> the test soil. It is noted that the soil was left<br />

<strong>for</strong> 3 weeks to equilibrate be<strong>for</strong>e testing. Lock and Janssen (2002) also found that Pb-nitrate was<br />

more toxic than Pb-chloride, and they used Pb-nitrate in their experiments because 1000 mg/kg<br />

Pb-chloride did not produce any mortality in their range-finding tests. This difference in

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