Prevalence and persistence of microcystin in shoreline lake sediments and porewater, and associated potential for human health risk

摘要: Abstract Midlatitude waterbodies are experiencing increased cyanobacteria blooms that necessitate health advisories to protect waterbody users. Although surface waters may contain cyanotoxins such as microcystin (MC), at concentrations pose potential public risks, little is known about MC contamination of shoreline sediments. Based on growing evidence lake and reservoir sediments can accumulate MCs, we hypothesized (i.e., recreational beaches) MCs thereby a risk users even if people stay out contaminated water. We sampled nearshore water, sediment, porewater from seven Washington State, USA, lakes/reservoirs beaches determine presence/absence during or immediately following blooms. found in all using ELISA LC-MS/MS. porewaters persisted for 20 days dissipation when were near analytical reporting limits corresponding waters. A human assessment based exposure through incidental ingestion found, very high occur >11,000 μg/L), estimated doses below World Health Organization tolerable daily intake U.S. Environmental Protection Agency’s reference dose. While our findings suggest State 2018 did not present significant risk, future with higher could risks via the sediment/porewater pathway.