Ecotoxicity screening of novel phosphorus adsorbents used for lake restoration

I. Álvarez-Manzaneda, Anders Baun, L. Cruz-Pizarro, I. de Vicente*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Short-term standardized laboratory tests were carried out for evaluating acute and chronic toxicological effects of novel phosphorus (P) adsorbents on Raphidocelis subcapitata (algal growth rate inhibition) and on Daphnia magna (immobilization, with direct and indirect exposure to adsorbents, and uptake-depuration tests). Four P adsorbents were tested: two magnetic (HQ and Fe3O4) and two non magnetic (CFH-12® and Phoslock®). For the case of the algal growth inhibition test, the EC50 was 1.5 and 0.42 g L−1 for HQ and CFH-12®, respectively, and no inhibition patterns were observed neither for Fe3O4 nor for Phoslock®. When organisms were exposed to a direct contact, in the D. magna immobilization test, no statistically significant differences were found in the EC50 values among the four studied adsorbents. The huge difference between direct and indirect contact experiments suggests that toxicity is mainly physically mediated. The uptake-depuration test evidenced a much faster uptake and depuration rates for Phoslock®, which was precisely the adsorbent with the highest particle size. In a realistic worst-case scenario using data from Honda lake (Almería, Spain), where lake restoration is carried out by a adding a single large dose to bind surplus P in the lake, the predicted environmental concentrations for all adsorbents were lower than EC50 for all adsorbents and they were found to exceed a provisional limit value for ecotoxicity after a short-term exposure. All in all, since neither accumulation nor longer term effects of P adsorbents in the pelagic phase is expected, this risk may however, on a case-to-case basis, be acceptable.

Original languageEnglish
JournalChemosphere
Volume222
Pages (from-to)469-478
ISSN0045-6535
DOIs
Publication statusPublished - 2019

Keywords

  • Daphnia magna
  • Eutrophication
  • Lake restoration
  • Phosphorus
  • Raphidocelis subcapitata
  • Toxicity

Cite this

Álvarez-Manzaneda, I. ; Baun, Anders ; Cruz-Pizarro, L. ; de Vicente, I. / Ecotoxicity screening of novel phosphorus adsorbents used for lake restoration. In: Chemosphere. 2019 ; Vol. 222. pp. 469-478.
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abstract = "Short-term standardized laboratory tests were carried out for evaluating acute and chronic toxicological effects of novel phosphorus (P) adsorbents on Raphidocelis subcapitata (algal growth rate inhibition) and on Daphnia magna (immobilization, with direct and indirect exposure to adsorbents, and uptake-depuration tests). Four P adsorbents were tested: two magnetic (HQ and Fe3O4) and two non magnetic (CFH-12{\circledR} and Phoslock{\circledR}). For the case of the algal growth inhibition test, the EC50 was 1.5 and 0.42 g L−1 for HQ and CFH-12{\circledR}, respectively, and no inhibition patterns were observed neither for Fe3O4 nor for Phoslock{\circledR}. When organisms were exposed to a direct contact, in the D. magna immobilization test, no statistically significant differences were found in the EC50 values among the four studied adsorbents. The huge difference between direct and indirect contact experiments suggests that toxicity is mainly physically mediated. The uptake-depuration test evidenced a much faster uptake and depuration rates for Phoslock{\circledR}, which was precisely the adsorbent with the highest particle size. In a realistic worst-case scenario using data from Honda lake (Almer{\'i}a, Spain), where lake restoration is carried out by a adding a single large dose to bind surplus P in the lake, the predicted environmental concentrations for all adsorbents were lower than EC50 for all adsorbents and they were found to exceed a provisional limit value for ecotoxicity after a short-term exposure. All in all, since neither accumulation nor longer term effects of P adsorbents in the pelagic phase is expected, this risk may however, on a case-to-case basis, be acceptable.",
keywords = "Daphnia magna, Eutrophication, Lake restoration, Phosphorus, Raphidocelis subcapitata, Toxicity",
author = "I. {\'A}lvarez-Manzaneda and Anders Baun and L. Cruz-Pizarro and {de Vicente}, I.",
year = "2019",
doi = "10.1016/j.chemosphere.2019.01.103",
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Ecotoxicity screening of novel phosphorus adsorbents used for lake restoration. / Álvarez-Manzaneda, I.; Baun, Anders; Cruz-Pizarro, L.; de Vicente, I.

In: Chemosphere, Vol. 222, 2019, p. 469-478.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Ecotoxicity screening of novel phosphorus adsorbents used for lake restoration

AU - Álvarez-Manzaneda, I.

AU - Baun, Anders

AU - Cruz-Pizarro, L.

AU - de Vicente, I.

PY - 2019

Y1 - 2019

N2 - Short-term standardized laboratory tests were carried out for evaluating acute and chronic toxicological effects of novel phosphorus (P) adsorbents on Raphidocelis subcapitata (algal growth rate inhibition) and on Daphnia magna (immobilization, with direct and indirect exposure to adsorbents, and uptake-depuration tests). Four P adsorbents were tested: two magnetic (HQ and Fe3O4) and two non magnetic (CFH-12® and Phoslock®). For the case of the algal growth inhibition test, the EC50 was 1.5 and 0.42 g L−1 for HQ and CFH-12®, respectively, and no inhibition patterns were observed neither for Fe3O4 nor for Phoslock®. When organisms were exposed to a direct contact, in the D. magna immobilization test, no statistically significant differences were found in the EC50 values among the four studied adsorbents. The huge difference between direct and indirect contact experiments suggests that toxicity is mainly physically mediated. The uptake-depuration test evidenced a much faster uptake and depuration rates for Phoslock®, which was precisely the adsorbent with the highest particle size. In a realistic worst-case scenario using data from Honda lake (Almería, Spain), where lake restoration is carried out by a adding a single large dose to bind surplus P in the lake, the predicted environmental concentrations for all adsorbents were lower than EC50 for all adsorbents and they were found to exceed a provisional limit value for ecotoxicity after a short-term exposure. All in all, since neither accumulation nor longer term effects of P adsorbents in the pelagic phase is expected, this risk may however, on a case-to-case basis, be acceptable.

AB - Short-term standardized laboratory tests were carried out for evaluating acute and chronic toxicological effects of novel phosphorus (P) adsorbents on Raphidocelis subcapitata (algal growth rate inhibition) and on Daphnia magna (immobilization, with direct and indirect exposure to adsorbents, and uptake-depuration tests). Four P adsorbents were tested: two magnetic (HQ and Fe3O4) and two non magnetic (CFH-12® and Phoslock®). For the case of the algal growth inhibition test, the EC50 was 1.5 and 0.42 g L−1 for HQ and CFH-12®, respectively, and no inhibition patterns were observed neither for Fe3O4 nor for Phoslock®. When organisms were exposed to a direct contact, in the D. magna immobilization test, no statistically significant differences were found in the EC50 values among the four studied adsorbents. The huge difference between direct and indirect contact experiments suggests that toxicity is mainly physically mediated. The uptake-depuration test evidenced a much faster uptake and depuration rates for Phoslock®, which was precisely the adsorbent with the highest particle size. In a realistic worst-case scenario using data from Honda lake (Almería, Spain), where lake restoration is carried out by a adding a single large dose to bind surplus P in the lake, the predicted environmental concentrations for all adsorbents were lower than EC50 for all adsorbents and they were found to exceed a provisional limit value for ecotoxicity after a short-term exposure. All in all, since neither accumulation nor longer term effects of P adsorbents in the pelagic phase is expected, this risk may however, on a case-to-case basis, be acceptable.

KW - Daphnia magna

KW - Eutrophication

KW - Lake restoration

KW - Phosphorus

KW - Raphidocelis subcapitata

KW - Toxicity

U2 - 10.1016/j.chemosphere.2019.01.103

DO - 10.1016/j.chemosphere.2019.01.103

M3 - Journal article

VL - 222

SP - 469

EP - 478

JO - Chemosphere

JF - Chemosphere

SN - 0045-6535

ER -