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Issue 4, 2019
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Exploring the detection of microcystin-LR using polar organic chemical integrative samplers (POCIS)

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Abstract

Polar organic chemical integrative samplers (POCIS) were used in this study to explore passive sampling for the detection of microcystin-LR (MC-LR). POCIS were deployed in triplicate for a minimum of 28 days at the inlet and outlet of a 1 km2, 4.2 km long lake in Atlantic Canada. POCIS results were compared to lake water grab sampling and followed a similar trend. Laboratory POCIS studies using lake water spiked with known MC-LR concentrations were used to estimate lake water concentrations over the deployment period by calculating POCIS sampling rate (Rs). The Rs for MC-LR in this lake water was found to be 0.045 (±0.001) and 0.041 (±0.001) L per day for initial concentrations of 0.5 and 1.0 μg L−1. Estimated MC-LR concentrations from POCIS were generally higher than grab sampling results, especially at the outlet to the lake from late September to late October. This could possibly give a better picture of MC-LR concentrations in the lake; MC-LR concentrations can fluctuate substantially over short time periods. POCIS were able to detect MC-LR in the water stream when grab sampling resulted in non-detects (i.e., below detection limit of LC-MS/MS). The use of passive sampling for MC-LR could have beneficial implications for public health and toxicity testing by lowering detection limits for this chronically and acutely toxic chemical. The correlation of aqueous MC-LR concentrations to POCIS MC-LR concentrations needs further study.

Graphical abstract: Exploring the detection of microcystin-LR using polar organic chemical integrative samplers (POCIS)

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Publication details

The article was received on 12 Dec 2018, accepted on 14 Mar 2019 and first published on 20 Mar 2019


Article type: Paper
DOI: 10.1039/C8EM00569A
Citation: Environ. Sci.: Processes Impacts, 2019,21, 659-666

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    Exploring the detection of microcystin-LR using polar organic chemical integrative samplers (POCIS)

    M. J. Brophy, Allison L. Mackie, Y. Park and G. A. Gagnon, Environ. Sci.: Processes Impacts, 2019, 21, 659
    DOI: 10.1039/C8EM00569A

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