Aldehyde concentrations in wet deposition and river waters

Spatial distributions of and diurnal variations in low molecular weight carbonyl compounds in coastal seawater, and the controlling factors

“…However, concentrations of formaldehyde in coastal seawater in Terra Nova Bay, Antarctica were 300-1000 nM (Largiuni et al, 2005). For river water, concentrations in an urban area of Poland (Dabrowska and Nawrocki, 2013) were 2-3 orders of magnitude or more higher than those of the Ohta River (Takeda et al, 2006).…”

Simultaneous assessments of occurrence, ecological, human health, and organoleptic hazards for 77 VOCs in typical drinking water sources from 5 major river basins, China

“…They are detected frequently, but not regulated currently in China. Many of this class of compounds are toxic and can be blamed for odor problems (Dą browska and Nawrocki, 2013). Therefore, they should be paid more attention to than common VOCs.…”

“…Halogenated hydrocarbons used to be thought as the most frequently detected VOCs, followed by benzene, toluene, ethylbenzene and xylene (Chary and FernandezAlba, 2012;Ma et al, 2014), thus they were known as common VOCs (Niri et al, 2008). The carbonyl compounds are also widely present in the aqueous environment, even more widely than common VOCs, which concentrations in river waters ranged from 0.04 to 513 mg/L (Chen et al, 2013;Dą browska and Nawrocki, 2013;Takeda et al, 2006). The presence of aldehydes in raw and finished water intended to be used for potable purposes is undesirable since they may cause taste and odor problems (Bao et al, 1997;Dą browska and Nawrocki, 2013).…”

“…The carbonyl compounds are also widely present in the aqueous environment, even more widely than common VOCs, which concentrations in river waters ranged from 0.04 to 513 mg/L (Chen et al, 2013;Dą browska and Nawrocki, 2013;Takeda et al, 2006). The presence of aldehydes in raw and finished water intended to be used for potable purposes is undesirable since they may cause taste and odor problems (Bao et al, 1997;Dą browska and Nawrocki, 2013). Especially, formation of aldehydes during pre-ozonation process and removal of this class by using coagulation/flocculation and filtration processes in drinking water treatment plants has been also reported (Papageorgiou et al, 2014).…”

Formation of aldehydes and carboxylic acids in ozonated surface water and wastewater: A clear relationship with fluorescence changes

“…Some aldehydes (e.g., formaldehyde, acetaldehyde, glyoxal and methylglyoxal) are toxic and had been classified as known carcinogens or suspected carcinogens (Richardson et al, 2007;McGwin et al, 2009). They may also be responsible for the undesirable odor in the treated waters because of their very low odor detection thresholds, e.g., 4.0 lg L À1 for acetaldehyde (Dą browska and Nawrocki, 2013). Additionally, because ACA species are major http://dx.doi.org/10.1016/j.chemosphere.2014.12.054 0045-6535/Ó 2014 Elsevier Ltd. All rights reserved.…”