Table 2.
Priority pesticides and pesticide transformation products that exceeded exposure activity ratios (EARChem) or toxicity quotient (TQ) thresholds in polar organic chemical integrated samplers (POCIS) samples collected from 15 Great Lakes tributaries, June–July 2016
| Number of sites | |||||
|---|---|---|---|---|---|
| Chemical class | CAS | Chemical name | Detections | EARChem > 10–3 | TQ > 0.1 |
| Herbicide | 51218‐45‐2 | Metolachlor | 15 | 11 | 2 |
| 1912‐24‐9 | Atrazine | 15 | 7 | 4 | |
| 34256‐82‐1 | Acetochlor | 15 | 5 | 1 | |
| 122836‐35‐5 | Sulfentrazone | 15 | 2 | 0 | |
| 94‐75‐7 | 2,4‐D | 14 | 13 | 0 | |
| 330‐54‐1 | Diuron | 13 | 9 | 0 | |
| 122‐34‐9 | Simazine | 13 | 2 | 0 | |
| 139‐40‐2 | Propazine | 13 | 1 | 0 | |
| 25057‐89‐0 | Bentazone | 12 | 1 | 0 | |
| 87674‐68‐8 | Dimethenamid | 12 | 1 | 0 | |
| 55335‐06‐3 | Triclopyr | 10 | 1 | 0 | |
| Herbicide TP | 1007‐28‐9 | Deisopropylatrazine | 13 | 2 | * |
| 171118‐09‐5 | Metolachlor ESA | 13 | 1 | * | |
| 56507‐37‐0 | Diketometribuzin | 3 | 1 | * | |
| Fungicide | 57837‐19‐1 | Metalaxyl | 14 | 1 | 0 |
| Insecticide | 120068‐37‐3 | Fipronil | 15 | 1 | 4 |
| 138261‐41‐3 | Imidacloprid | 13 | 1 | 13 | |
| Insecticide TP | 120068‐36‐2 | Fipronil sulfone | 14 | * | 1 |
2,4‐D = 2,4‐dichlorophenoxyacetic acid; CAS = Chemical Abstracts Service number; ESA = ethane sulfonic acid; TP = transformation product; *no benchmark available.