Unpredictable drinking water odor-taste issues are increasingly difficult to manage for water utilities, because routine water parameters (e.g., turbidity, DOC, and DON) do not explain the odor trends any more. Highly water-soluble organics (e.g., amino acids and saccharides) can form odorous DBPs during disinfection, but their concentrations in source water are often low, which may cause little change in common water parameters. Therefore, monitoring water-soluble organics in source water is important to investigate this issue. Lack of simple and practical on-site sampling techniques hamper this effort. Therefore, we have created two functionalized nested-in-sponge silica monoliths (NiS-SM) using a one-pot synthesis method and demonstrated their application to extract highly soluble organics in water. We created extraction disks using the functionalized NiS-SM materials for spinning sampling to achieve fast extraction. The spinning sampling coupled to HPLC-MS/MS analysis provided limits of detection (LODs) for amino acids at 0.038-0.092 ng L-1 and monosaccharides at 0.036-0.14 ng L-1. In a one-week longitudinal monitoring of river water, we demonstrated the spinning sampling technique for on-site sampling and monitoring of highly soluble organics, including amino acids (2.9-21.2 ng L-1) and monosaccharides (2.5-70.0 ng L-1) in the river. The results of on-site spinning sampling are consistent with those of grab sampling. The new composite materials and rapid on-site sampling technique are unique and efficient tools for monitoring of highly soluble organics in water sources.

Development and application of functionalized nested-in-sponge silica monolith for water research

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ACS Fall 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.