The toxicity and bioavailability of atrazine and molinate to Chironomus tepperi larvae in laboratory and river water in the presence and absence of sediment

Yin Latt Phyu; M. St J. Warne; R. P. Lim

doi:10.1016/j.chemosphere.2004.10.035

The toxicity and bioavailability of atrazine and molinate to Chironomus tepperi larvae in laboratory and river water in the presence and absence of sediment

Yin Latt Phyu, M. St J. Warne, R. P. Lim

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Acute (10 day) semi-static toxicity tests in which the midge, Chironomus tepperi, were exposed to atrazine and molinate were conducted in laboratory water and in river water, in the absence and presence of sediment. The bioavailability measured as median lethal concentrations (LC₅₀) and 95% fiducial limits (FLs) of atrazine to C. tepperi in laboratory water in the absence and presence of sediment were 16.6 (14.3-19.4) and 21.0 (18.2-24.1) mg l^-1, respectively while the corresponding values in river water were 16.7 (14.7-19.0) and 22.7 (20.3-25.4) mg l^-1, respectively. For molinate, the LC₅₀ and FL values in laboratory water in the absence and presence of sediment were 8.8 (6.8-11.4) and 14.3 (12.4-16.4) mg l ^-1, respectively and the corresponding values in river water were 9.3 (7.6-11.3) and 14.5 (12.4-16.9) mg l^-1, respectively. Atrazine has low toxicity (LC₅₀ > 10 mg l^-1) while molinate has moderate toxicity (1 mg l^-1 < LC₅₀ < 10 mg l ^-1) to C. tepperi. River water did not significantly (P > 0.05) reduce the bioavailability of either chemical to C. tepperi. However, the presence of sediment did significantly (P < 0.05) reduce the bioavailability of both atrazine and molinate to C. tepperi.

Original language	English
Pages (from-to)	1231-1239
Number of pages	9
Journal	Chemosphere
Volume	58
Issue number	9
Early online date	1 Jan 2005
DOIs	https://doi.org/10.1016/j.chemosphere.2004.10.035
Publication status	Published - 1 Mar 2005
Externally published	Yes

Funding

Yin Latt Phyu, gratefully acknowledges the Faculty of Science of the University of Technology Sydney, Insearch Ltd. and the Open Society Institution for providing financial support. She also would especially like to profoundly thank Prof. Tony Moon, the Dean of Faculty of Science for obtaining the scholarship and his tremendous support throughout this study. The authors would like to thank the Centre for Ecotoxicology for use of its laboratory facilities.

Keywords

Atrazine
Bioavailability
C. tepperi
Molinate
River water
Sediment

ASJC Scopus subject areas

Environmental Engineering
Environmental Chemistry
General Chemistry
Pollution
Health, Toxicology and Mutagenesis

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10.1016/j.chemosphere.2004.10.035

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title = "The toxicity and bioavailability of atrazine and molinate to Chironomus tepperi larvae in laboratory and river water in the presence and absence of sediment",

abstract = "Acute (10 day) semi-static toxicity tests in which the midge, Chironomus tepperi, were exposed to atrazine and molinate were conducted in laboratory water and in river water, in the absence and presence of sediment. The bioavailability measured as median lethal concentrations (LC50) and 95\% fiducial limits (FLs) of atrazine to C. tepperi in laboratory water in the absence and presence of sediment were 16.6 (14.3-19.4) and 21.0 (18.2-24.1) mg l-1, respectively while the corresponding values in river water were 16.7 (14.7-19.0) and 22.7 (20.3-25.4) mg l-1, respectively. For molinate, the LC50 and FL values in laboratory water in the absence and presence of sediment were 8.8 (6.8-11.4) and 14.3 (12.4-16.4) mg l -1, respectively and the corresponding values in river water were 9.3 (7.6-11.3) and 14.5 (12.4-16.9) mg l-1, respectively. Atrazine has low toxicity (LC50 > 10 mg l-1) while molinate has moderate toxicity (1 mg l-1 < LC50 < 10 mg l -1) to C. tepperi. River water did not significantly (P > 0.05) reduce the bioavailability of either chemical to C. tepperi. However, the presence of sediment did significantly (P < 0.05) reduce the bioavailability of both atrazine and molinate to C. tepperi.",

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AU - Phyu, Yin Latt

AU - Warne, M. St J.

AU - Lim, R. P.

PY - 2005/3/1

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N2 - Acute (10 day) semi-static toxicity tests in which the midge, Chironomus tepperi, were exposed to atrazine and molinate were conducted in laboratory water and in river water, in the absence and presence of sediment. The bioavailability measured as median lethal concentrations (LC50) and 95% fiducial limits (FLs) of atrazine to C. tepperi in laboratory water in the absence and presence of sediment were 16.6 (14.3-19.4) and 21.0 (18.2-24.1) mg l-1, respectively while the corresponding values in river water were 16.7 (14.7-19.0) and 22.7 (20.3-25.4) mg l-1, respectively. For molinate, the LC50 and FL values in laboratory water in the absence and presence of sediment were 8.8 (6.8-11.4) and 14.3 (12.4-16.4) mg l -1, respectively and the corresponding values in river water were 9.3 (7.6-11.3) and 14.5 (12.4-16.9) mg l-1, respectively. Atrazine has low toxicity (LC50 > 10 mg l-1) while molinate has moderate toxicity (1 mg l-1 < LC50 < 10 mg l -1) to C. tepperi. River water did not significantly (P > 0.05) reduce the bioavailability of either chemical to C. tepperi. However, the presence of sediment did significantly (P < 0.05) reduce the bioavailability of both atrazine and molinate to C. tepperi.

AB - Acute (10 day) semi-static toxicity tests in which the midge, Chironomus tepperi, were exposed to atrazine and molinate were conducted in laboratory water and in river water, in the absence and presence of sediment. The bioavailability measured as median lethal concentrations (LC50) and 95% fiducial limits (FLs) of atrazine to C. tepperi in laboratory water in the absence and presence of sediment were 16.6 (14.3-19.4) and 21.0 (18.2-24.1) mg l-1, respectively while the corresponding values in river water were 16.7 (14.7-19.0) and 22.7 (20.3-25.4) mg l-1, respectively. For molinate, the LC50 and FL values in laboratory water in the absence and presence of sediment were 8.8 (6.8-11.4) and 14.3 (12.4-16.4) mg l -1, respectively and the corresponding values in river water were 9.3 (7.6-11.3) and 14.5 (12.4-16.9) mg l-1, respectively. Atrazine has low toxicity (LC50 > 10 mg l-1) while molinate has moderate toxicity (1 mg l-1 < LC50 < 10 mg l -1) to C. tepperi. River water did not significantly (P > 0.05) reduce the bioavailability of either chemical to C. tepperi. However, the presence of sediment did significantly (P < 0.05) reduce the bioavailability of both atrazine and molinate to C. tepperi.

KW - Atrazine

KW - Bioavailability

KW - C. tepperi

KW - Molinate

KW - River water

KW - Sediment

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SN - 0045-6535

VL - 58

SP - 1231

EP - 1239

JO - Chemosphere

JF - Chemosphere

IS - 9

ER -

The toxicity and bioavailability of atrazine and molinate to Chironomus tepperi larvae in laboratory and river water in the presence and absence of sediment

Abstract

Funding

Keywords

ASJC Scopus subject areas

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