Removal of Microcystins and Nodularin-R from Water by Corncobs Studied Using LC-MS
Start Date
23-5-2022 5:45 PM
End Date
23-5-2022 7:00 PM
Abstract
Microcystins (MCs) and nodularins are released during harmful algal blooms (HABs) in fresh and brackish water. Consumption of water contaminated with MCs or nodularins can promote health risks for humans and animals. In this study, The Andersons corncobs were acid refluxed and heat treated to remove MCs and nodularin-R from water. Simultaneous sorption of six common MC congeners (MC-RR, MC-YR, MC-LR, MC-LA, MC-LW, and MC-LF) and nodularin-R onto treated corncobs was determined in suspension and filter mode. An LC-Orbitrap-MS system was used to measure the percent removal of MCs and NOD-R in water. Results from preliminary sorption experiments showed that a sorbent (S-5), which was acid refluxed and heat treated, has the highest removal efficiency. When a mixture containing six MCs and nodularin-R (10 µg/L each) was incubated with 50 mg of sorbent, all analytes were completely removed. Even after increasing the concentration of analytes ten times, removal for all analytes by sorbent was ≥ 98.1%. When S-5 was incubated with Lake Erie water collected during the 2020 HAB, it was able to remove most of the MC variants completely. LC-MS was used to show that treated corncobs are promising sorbent materials to remove MCs and nodularin-R from drinking water.
Removal of Microcystins and Nodularin-R from Water by Corncobs Studied Using LC-MS
Microcystins (MCs) and nodularins are released during harmful algal blooms (HABs) in fresh and brackish water. Consumption of water contaminated with MCs or nodularins can promote health risks for humans and animals. In this study, The Andersons corncobs were acid refluxed and heat treated to remove MCs and nodularin-R from water. Simultaneous sorption of six common MC congeners (MC-RR, MC-YR, MC-LR, MC-LA, MC-LW, and MC-LF) and nodularin-R onto treated corncobs was determined in suspension and filter mode. An LC-Orbitrap-MS system was used to measure the percent removal of MCs and NOD-R in water. Results from preliminary sorption experiments showed that a sorbent (S-5), which was acid refluxed and heat treated, has the highest removal efficiency. When a mixture containing six MCs and nodularin-R (10 µg/L each) was incubated with 50 mg of sorbent, all analytes were completely removed. Even after increasing the concentration of analytes ten times, removal for all analytes by sorbent was ≥ 98.1%. When S-5 was incubated with Lake Erie water collected during the 2020 HAB, it was able to remove most of the MC variants completely. LC-MS was used to show that treated corncobs are promising sorbent materials to remove MCs and nodularin-R from drinking water.