Die "Hilfsgemeinschaft auf Gegenseitigkeit" (HIAG) 1950 - 1990

Wilke, Karsten

doi:10.30965/9783657772353

Cited by 25 publications

(16 citation statements)

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“…C 7 H 14 O 2 could be heptanoic acid which has been previously measured indoors and is released from building materials. 4,23 C 8 H 8 O 3 could be methylparaben, measured indoors and present in personal care products, 24 or methyl salicylate, released from plants. 25 The behaviors and possible structures of these compounds suggest that the AC system in cooling mode is a substantial sink.…”

Section: Dramatic Effect Of Ac Use On Wsog Concentrationsmentioning

confidence: 99%

Dynamics of Residential Water-Soluble Organic Gases: Insights into Sources and Sinks

Duncan

Tomaz

Morrison

et al. 2019

Environ. Sci. Technol.

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Water-soluble organic gas (WSOG) concentrations are elevated in homes. However, WSOG sources, sinks, and concentration dynamics are poorly understood. We observed substantial variations in 23 residential indoor WSOG concentrations measured in real time in a North Carolina, U.S. home over several days with a high-resolution time-of-flight chemical ionization mass spectrometer equipped with iodide reagent ion chemistry (I-HR-ToF-CIMS). Concentrations of acetic, formic, and lactic acids ranged from 30-130, 15-53, and 2.5-360 μg m −3 , respectively. Concentrations of several WSOGs, including acetic and formic acids, decreased considerably (~ 30-50%) when the air conditioner (AC) cycled on, suggesting that the AC system is an important sink for indoor WSOGs. In contrast to non-polar organic gases, indoor WSOG loss rate coefficients were substantial for compounds with high O:C ratios (e.g., 1.6-2.2 h −1 for compounds with O:C > 0.75 when the AC system was off). Loss rate coefficients in the AC system were more uncertain, but were estimated to be 1.5 hr −1. Elevated concentrations of lactic acid coincided with increased human occupancy and cooking. We report several WSOGs emitted from cooking and cleaning as well as transported in from outdoors. In addition to indoor air chemistry, these results have implications to exposure and human health.

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Section: Dramatic Effect Of Ac Use On Wsog Concentrationsmentioning

confidence: 99%

Dynamics of Residential Water-Soluble Organic Gases: Insights into Sources and Sinks

Duncan

Tomaz

Morrison

et al. 2019

Environ. Sci. Technol.

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“…We analyzed and presented the data using R version 4.2 21 and a collection of contributed packages. [22][23][24][25][26][27] Material necessary to reproduce the results is available on GitHub 28 and functions for post-processing FFF data are available as a separate R package. 29…”

Section: Discussionmentioning

confidence: 99%

Sodium silicate and hexametaphosphate promote the release of (oxyhydr)oxide nanoparticles from corroding iron

Trueman

Locsin

Doré

et al. 2022

Preprint

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Sequestrants such as polyphosphate and sodium silicate are used widely to control iron precipitation in drinking water, but less is known about their impacts on iron corrosion scale. Here we characterize the nanoparticulate iron (oxyhydr)oxide suspensions that result from corroding cast iron coupons in solutions containing either sodium hexametaphosphate (3 mg P L-1) or sodium silicate (100 mg SiO2 L-1). We determined the elemental composition and size distribution of these suspensions using flow field-flow fractionation with ultraviolet, multielement, and multiangle light scattering detection (FFF-UV-MALS-ICP-MS). Both sequestrants yielded stable iron suspensions, and the pooled median radius of gyration at peak 57Fe intensity was 22 nm, corresponding to a sphere-equivalent geometric diameter of 57 nm. The median Feret diameter and ASTM roundness were 50 nm and 0.4, respectively, as determined by transmission electron microscopy. Lead associated readily with iron nanoparticles, and in the hexametaphosphate suspension it associated preferentially with iron over free hexametaphosphate. Sequestrants then, may interact with iron corrosion scale to yield effective transport vectors for lead in drinking water systems, even when complexation of free lead by the sequestrant is negligible.

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“…21) and a collection of contributed packages. 22–27 Material necessary to reproduce the results is available on GitHub 28 and functions for post-processing FFF data are available as a separate R package. 29…”

Section: Methodsmentioning

confidence: 99%

Sodium silicate and hexametaphosphate promote the release of (oxyhydr)oxide nanoparticles from corroding iron

Trueman

Locsin

Doré

et al. 2022

Environ. Sci.: Adv.

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Die "Hilfsgemeinschaft auf Gegenseitigkeit" (HIAG) 1950 - 1990

Cited by 25 publications

References 0 publications

Dynamics of Residential Water-Soluble Organic Gases: Insights into Sources and Sinks

Dynamics of Residential Water-Soluble Organic Gases: Insights into Sources and Sinks

Sodium silicate and hexametaphosphate promote the release of (oxyhydr)oxide nanoparticles from corroding iron

Sodium silicate and hexametaphosphate promote the release of (oxyhydr)oxide nanoparticles from corroding iron

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