Abstract
As the first step toward parameterization of a chronic lead (Pb) biotic ligand model (BLM) for Ceriodaphnia dubia, 7-d toxicity tests were performed in waters modified to evaluate the influences of hardness, DOM (as Suwannee River NOM and Aldrich humic acid (HA)), pH (buffered with 4mM MOPS) and alkalinity on the chronic toxicity of Pb. Calculated EC20s for the control base water test and each of the most extreme modified test waters were as follows in γgL-1 Pb (95% confidence interval): base water control=45 (14-53), 5mM CaSO4=22 (12-30), 32mgL-1 DOM=523 (388-573), 2.5mM NaHCO3=73 (21-120) and pH 6.4 buffered with MOPS=3.9γgL-1 Pb (1-5). Results indicate that hardness does not protect against chronic toxicity of Pb to C. dubia, whereas HA does protect at the highest concentration tested (597γM). Additionally, our findings suggest that low pH increases the chronic toxicity of Pb whereas increased alkalinity is protective. The findings reported herein support the need for a chronic Pb BLM as an alternative approach to hardness-based regulations.
| Original language | English |
|---|---|
| Pages (from-to) | 238-243 |
| Number of pages | 6 |
| Journal | Ecotoxicology and Environmental Safety |
| Volume | 74 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 1 2011 |
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Keywords
- Alkalinity
- Biotic ligand model
- Dissolved organic matter
- Hardness
- Pb
- Water quality
ASJC Scopus subject areas
- Health, Toxicology and Mutagenesis
- Public Health, Environmental and Occupational Health
- Pollution
Cite this
Effects of water chemistry on the chronic toxicity of lead to the cladoceran, Ceriodaphnia dubia. / Mager, Edward M.; Brix, Kevin V.; Gerdes, Robert M.; Ryan, Adam C.; Grosell, Martin.
In: Ecotoxicology and Environmental Safety, Vol. 74, No. 3, 01.03.2011, p. 238-243.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of water chemistry on the chronic toxicity of lead to the cladoceran, Ceriodaphnia dubia
AU - Mager, Edward M.
AU - Brix, Kevin V.
AU - Gerdes, Robert M.
AU - Ryan, Adam C.
AU - Grosell, Martin
PY - 2011/3/1
Y1 - 2011/3/1
N2 - As the first step toward parameterization of a chronic lead (Pb) biotic ligand model (BLM) for Ceriodaphnia dubia, 7-d toxicity tests were performed in waters modified to evaluate the influences of hardness, DOM (as Suwannee River NOM and Aldrich humic acid (HA)), pH (buffered with 4mM MOPS) and alkalinity on the chronic toxicity of Pb. Calculated EC20s for the control base water test and each of the most extreme modified test waters were as follows in γgL-1 Pb (95% confidence interval): base water control=45 (14-53), 5mM CaSO4=22 (12-30), 32mgL-1 DOM=523 (388-573), 2.5mM NaHCO3=73 (21-120) and pH 6.4 buffered with MOPS=3.9γgL-1 Pb (1-5). Results indicate that hardness does not protect against chronic toxicity of Pb to C. dubia, whereas HA does protect at the highest concentration tested (597γM). Additionally, our findings suggest that low pH increases the chronic toxicity of Pb whereas increased alkalinity is protective. The findings reported herein support the need for a chronic Pb BLM as an alternative approach to hardness-based regulations.
AB - As the first step toward parameterization of a chronic lead (Pb) biotic ligand model (BLM) for Ceriodaphnia dubia, 7-d toxicity tests were performed in waters modified to evaluate the influences of hardness, DOM (as Suwannee River NOM and Aldrich humic acid (HA)), pH (buffered with 4mM MOPS) and alkalinity on the chronic toxicity of Pb. Calculated EC20s for the control base water test and each of the most extreme modified test waters were as follows in γgL-1 Pb (95% confidence interval): base water control=45 (14-53), 5mM CaSO4=22 (12-30), 32mgL-1 DOM=523 (388-573), 2.5mM NaHCO3=73 (21-120) and pH 6.4 buffered with MOPS=3.9γgL-1 Pb (1-5). Results indicate that hardness does not protect against chronic toxicity of Pb to C. dubia, whereas HA does protect at the highest concentration tested (597γM). Additionally, our findings suggest that low pH increases the chronic toxicity of Pb whereas increased alkalinity is protective. The findings reported herein support the need for a chronic Pb BLM as an alternative approach to hardness-based regulations.
KW - Alkalinity
KW - Biotic ligand model
KW - Dissolved organic matter
KW - Hardness
KW - Pb
KW - Water quality
UR - http://www.scopus.com/inward/record.url?scp=79952002105&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79952002105&partnerID=8YFLogxK
U2 - 10.1016/j.ecoenv.2010.11.005
DO - 10.1016/j.ecoenv.2010.11.005
M3 - Article
C2 - 21145110
AN - SCOPUS:79952002105
VL - 74
SP - 238
EP - 243
JO - Ecotoxicology and Environmental Safety
JF - Ecotoxicology and Environmental Safety
SN - 0147-6513
IS - 3
ER -