Environmental Sciences Europe

Table 1 Example with toxicity and exposure values for hypothetical substances and scenarios based on worst-case RQ_mix

From: An efficient and pragmatic approach for regulatory aquatic mixture risk assessment of pesticides

	Substance A		Substance B		Mixture risk^a
EC50 [mg a.s./L]	1.1		82
RAC [mg a.s./L]	0.011		0.82
Scenario	PEC [mg a.s./L]	RQ	PEC [mg a.s./L]	RQ	RQ_mix	AF*ETR_mix,CA
1	0.001	0.091	0.317	0.387	0.477	0.477
2	0.002	0.182	0.291	0.355	0.537	0.537
3	0.007	0.636	0.211	0.257	0.894	0.894
4	0.006	0.545	0.256	0.312	0.858	0.858
5^b	0.008	0.727	0.195	0.238	0.965	0.965

^a The calculated RQ_mix is identical to the CA-based ETR_mix,CA multiplied by the assessment factor (AF = 100)
^b Selected worst-case scenario

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