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Zinc - The Risk Assessment Information System

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3.0 ECO-SSL FOR TERRESTRIAL PLANTS<br />

Of the papers identified from the literature search process, 680 papers were selected for<br />

acquisition for further review. Of those papers acquired, 78 met all 11 Study Acceptance Criteria<br />

(U.S. EPA, 2003; Attachment 3-1). Each of these papers were reviewed and the studies were<br />

scored according to the Eco-SSL guidance (U.S. EPA, 2003; Attachment 3-2). Thirty-nine study<br />

results received an Evaluation Score greater than ten (U.S. EPA, 2003; Attachment 3-1). <strong>The</strong>se<br />

studies are listed in Table 3.1.<br />

<strong>The</strong> studies in Table 3.1 are sorted by bioavailability score. <strong>The</strong>re are five studies with a<br />

bioavailability score of 2 that are eligible for Eco-SSL derivation. <strong>The</strong>se results were used to<br />

derive the plant Eco-SSL for zinc (U.S. EPA, 2003; Attachment 3-2). <strong>The</strong> Eco-SSL is the<br />

geometric mean of the maximum acceptable toxicant concentration (MATC) values for three<br />

species under different test conditions (pH and % organic matter (OM)) and is equal to 160 mg/kg<br />

dw.<br />

4.0 ECO-SSL FOR SOIL INVERTEBRATES<br />

Of the papers identified from the literature search process, 162 papers were selected for<br />

acquisition for further review. Of those papers acquired, 26 met all 11 Study Acceptance Criteria<br />

(U.S. EPA 2003; Attachment 3-1). Each of these papers were reviewed and the studies were<br />

scored according to the Eco-SSL guidance (U.S. EPA, 2003; Attachment 3-2). Forty studies<br />

received an Evaluation Score greater than ten. <strong>The</strong>se studies are listed in Table 4.1.<br />

<strong>The</strong> studies in Table 4.1 are sorted by bioavailability score. <strong>The</strong>re are six studies with a<br />

bioavailability score of 2 that are eligible for Eco-SSL derivation. <strong>The</strong>se results were used to<br />

derive the soil invertebrate Eco-SSL for zinc (U.S. EPA, 2003; Attachment 3-2). <strong>The</strong> Eco-SSL is<br />

the geometric mean of the EC 10 and MATC values for at least three test species under different<br />

test conditions (pH and OM%) and is equal to 120 mg/kg dw.<br />

Eco-SSL for <strong>Zinc</strong> 4<br />

June 2007

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