Arsenic toxicity, bioaccumulation and risk assessment: A case study in Tolimique Dam, Aguascalientes, Mexico

Figures & data

Table 1. Comparison of sensitivity to arsenic in rotifers and oligochaetes

Scientific name	Toxicological endpoint	Adverse effects	Time
Lecane cornuta	LC50 = 1.05 mg L^−1	Mortality	24 h
Brachionus rubens	LC50 = 0.607 mg L^−1	Mortality	24 h
B. calyciflorus	Range = 0.75–2.0 mg L^−1	Endocrine disruption	4 d
B. calyciflorus	Range = 0.025–2.0 mg L^−1	Male induction	4 d
Aeolosoma hemprichi	LC100 = 8.0 mg L^−1	Necrosis	30 min

Table 2. Risk assessment of arsenic in two rotifer species¹

	Risk Quotient (RQ)^3
MEC^2	Brachionus rubens (PNEC^4 = 1.05/1000)	Lecane cornuta (PNEC = 0.607/1000)
0.00196	1.87	3.23
0.00173	1.65	2.85
0.0012	1.14	1.98
0.00185	1.76	3.05
0.00301	2.87	4.96
0.00196	1.87	3.23

¹The risk factor of 1000 we used was according to Cruzeiro et al. (2017). ²Measured environmental concentration. ³RQ = MEC/PNEC. ⁴Predicted no-effect concentration.

Figure 1. Cellular necrosis in the oligoqueto Aelosoma hemprichi caused by acute arsenic exposure within 30 min.

Figure 2. Intrinsic growth rate (r) of females of the Rotifer Brachionus calyciflorus exposed to arsenic for 4 days. N = 6.

Cruzeiro, C., Amaral, S., Rocha, E., & Rocha, M. J. (2017). Determination of 54 pesticides in water of the Iberian Douro River estuary and risk assessment of environmentally relevant mixtures using theoretical approaches and Artemina salina and Daphnia magna bioassays. Ecotoxicology and Environmental Safety, 145, 126–134. doi:10.1016/j.ecoenv.2017.07.010

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