Toxicity in semiarid sediments influenced by tailings of an abandoned gold mine.

Toxicity in semiarid sediments influenced by tailings of an abandoned gold mine.

Environmental monitoring and assessment (2014-12-20)

A S Sobrino-Figueroa, O F Becerra-Rueda, V R Magallanes-Ordóñez, A Sánchez-González, A J Marmolejo-Rodríguez

ABSTRACT

The mining district of El Triunfo (ET-MD) has an estimated 800,000 t of mine wastes scattered in the environment, contaminating the sediment with potentially toxic elements such as As, Cd, Pb, and Zn. In order to estimate the toxicity of the sediment to the adjacent biota, the aims of our study are to calculate the mortality and inhibition through bioassays, using sediment, and test organisms such as Daphnia magna and Selenastrum capricornutum (Pseudokirchneriella subcapitata), respectively. The D. magna mortality was 31 ± 12% and the S. capricornutum growth inhibition was 53 ± 24%. The contamination of the sediment determines the high mortality of D. magna and the high inhibition of S. capricornutum in the system, indicating risk for the biota in the contaminated system.

MATERIALS

Product Number

Brand

Product Description

326542

Sigma-Aldrich

Gold, beads, 1-6 mm, 99.999% trace metals basis

326585

Sigma-Aldrich

Gold, powder, <10 μm, ≥99.9% trace metals basis

349305

Sigma-Aldrich

Gold, wire, diam. 1.0 mm, 99.997% trace metals basis

326526

Sigma-Aldrich

Gold, wire, diam. 0.127 mm, 99.99% trace metals basis

326534

Sigma-Aldrich

Gold, wire, diam. 0.25 mm, ≥99.9% trace metals basis

349240

Sigma-Aldrich

Gold, foil, thickness 0.25 mm, ≥99.9% trace metals basis

349275

Sigma-Aldrich

Gold, foil, thickness 0.05 mm, 99.99% trace metals basis

373168

Sigma-Aldrich

Gold, evaporation slug, diam. × L 0.6 cm × 0.6 cm, 99.99% trace metals basis

310980

Sigma-Aldrich

Gold, wire, diam. 0.5 mm, 99.99% trace metals basis

349283

Sigma-Aldrich

Gold, wire, diam. 0.1 mm, 99.99% trace metals basis

265772

Sigma-Aldrich

Gold, powder, <45 μm, 99.99% trace metals basis

265829

Sigma-Aldrich

Gold, foil, thickness 0.5 mm, 99.99% trace metals basis

265837

Sigma-Aldrich

Gold, rod, diam. 3.0 mm, 99.99% trace metals basis

GF04839767

Gold, tube, 100mm, outside diameter 1.60mm, inside diameter 0.6mm, wall thickness 0.5mm, as drawn, 99.95%

GF73794741

Gold, tube, 200mm, outside diameter 2.0mm, inside diameter 1.8mm, wall thickness 0.1mm, as drawn, 99.95%

GF98812097

Gold, rod, 6mm, diameter 6.0mm, as drawn, 99.95%

GF03557336

Gold, rod, 10mm, diameter 6.0mm, as drawn, 99.95%

GF05586969

Gold, tube, 100mm, outside diameter 3.0mm, inside diameter 2.8mm, wall thickness 0.10mm, as drawn, 99.95%

GF26034320

Gold, tube, 100mm, outside diameter 10.0mm, inside diameter 9.7mm, wall thickness 0.15mm, as drawn, 99.95%

GF37996789

Gold, tube, 200mm, outside diameter 2.0mm, inside diameter 1.7mm, wall thickness 0.15mm, as drawn, 99.95%

GF50454132

Gold, insulated wire, 2m, conductor diameter 0.125mm, insulation thickness 0.014mm, polyester insulation, 99.99%

GF75346678

Gold, insulated wire, 0.5m, conductor diameter 0.075mm, insulation thickness 0.012mm, PTFE (polytetrafluoroethylene) insulation, 99.99%

GF33293729

Gold, insulated wire, 0.1m, conductor diameter 0.125mm, insulation thickness 0.016mm, PTFE (polytetrafluoroethylene) insulation, 99.99%

GF38598980

Gold, microfoil, disks, 10mm, thinness 0.5μm, specific density 966μg/cm², permanent mylar 3.5μm support, 99.99+%

GF88214542

Gold, insulated wire, 1m, conductor diameter 0.05mm, insulation thickness 0.007mm, polyimide insulation, 99.99%

GF45838985

Gold, insulated wire, 0.5m, conductor diameter 0.125mm, insulation thickness 0.016mm, PTFE (polytetrafluoroethylene) insulation, 99.99%

GF92307922

Gold, insulated wire, 5m, conductor diameter 0.05mm, insulation thickness 0.007mm, polyester insulation, 99.99%

GF04885937

Gold, tube, 100mm, outside diameter 1.0mm, inside diameter 0.5mm, wall thickness 0.25mm, as drawn, 99.95%

GF18334436

Gold, insulated wire, 1m, conductor diameter 0.075mm, insulation thickness 0.012mm, PTFE (polytetrafluoroethylene) insulation, 99.99%

GF06182940

Gold, tube, 50mm, outside diameter 1.0mm, inside diameter 0.5mm, wall thickness 0.25mm, as drawn, 99.95%