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Impact of Suspended Solids on the Use of LuminoTox to Detect Toxicity of Micropollutants

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Abstract

There is an increasing need for tools to monitor toxicity of contaminants of emerging concern (CECs) in wastewater. The purpose of this work was to assess interferences in the presence of total solids (TS) and total suspended solids (TSS) in the LuminoTox at concentrations typical of those found in municipal secondary effluent (SE) and to evaluate a simple sample enrichment method for increased CEC sensitivity. 4 or 10 µg/L atrazine in different TS concentrations and in corresponding filtrates (TSS removed) exhibited equivalent toxicities. Because the only difference between these two fractions is the TSS, this result demonstrates that, generally, this fraction does not induce toxicity nor interfere with the bioassay. At constant medium-low TS, the LuminoTox was able to detect the presence of 4 µg/L of atrazine but could not distinguish the change in atrazine concentration between 4 and 6 µg/L. No inhibition was observed in the presence of a mix of 14 CECs each at 0.23 µg/L. However, upon sample enrichment by lyophilization (50×), an inhibition of 81 ± 3% was observed. The enriched SE alone (not spiked with CECs) led to an inhibition of 49 ± 1%, indicating the detection of the CEC contribution to toxicity after sample preconcentration. The LuminoTox is a promising tool for monitoring SE; however, if the intent is to detect CECs, enrichment method optimization is required.

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Abbreviations

SAPS:

Stabilized aqueous photosynthetic systems

CECs:

Contaminants of emerging concern

SE:

Secondary effluent

SWW:

Synthetic wastewater

MQW:

Milli Q water

ATZ:

Atrazine

Φ:

Photosystem II

NOM:

Natural Organic Matter

HAs:

Humic acids

PSD:

Particle size distribution

Lum-SPA:

LuminoTox Solid Phase Assay

Lum-LPA:

LuminoTox Leachate Phase Assay

Lum-DCA:

LuminoTox Direct Contact Assay

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Acknowledgements

The authors thank the staff of each WWTP for their cooperation and help during sampling campaigns. They thank Marco Pineda for his assistance with chemical analysis of the target CECs and Andrew Golsztajn and Ranjan Roy for their help with the Particle Size Distribution Analysis. The authors also thank the McGill Engineering Doctoral Award for supporting Meghan Marshall. A research grant was provided to Viviane Yargeau (PI) from the Natural Sciences and Engineering Research Council (NSERC) of Canada through the Discovery Grant Program (RGPIN/04635-2015).

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Correspondence to Viviane Yargeau.

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Marshall, M., Pineda, M. & Yargeau, V. Impact of Suspended Solids on the Use of LuminoTox to Detect Toxicity of Micropollutants. Arch Environ Contam Toxicol 74, 633–644 (2018). https://doi.org/10.1007/s00244-017-0478-6

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  • DOI: https://doi.org/10.1007/s00244-017-0478-6

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