Evaluation of Roundness Parameters in Use for Sand

Li, Linzhu; Iskander, Magued

doi:10.1061/(asce)gt.1943-5606.0002585

“…3, interquartile ranges in parentheses) and roundness values of 0.39 (0.31–0.49) and 0.42 (0.33–0.57) ( i.e. , “sub-rounded” 20 ).…”

Section: Resultsmentioning

confidence: 99%

“…19) by thresholding to differentiate particles from the background. Two metrics—the Feret diameter (the maximum of all transects across each particle perimeter) and the ASTM roundness 20 (the ratio of the observed area to the area of a circle with a diameter equal to the Feret diameter)—were estimated for each particle. We used a lower cutoff for particle identification of 335 nm 2 , which corresponds to the smallest spherical particle that the MALS detector can identify, based on manufacturer specifications (8 nm nominal radius of gyration).…”

Section: Methodsmentioning

confidence: 99%

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

Trueman

¹

,

Locsin

²

,

Doré

³

et al. 2022

Environ. Sci.: Adv.

0

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“…Images were scaled and then processed using ImageJ 1.53k 19 by thresholding to differentiate particles from the background. Two metrics-the Feret diameter (the maximum of all transects across each particle perimeter) and the ASTM roundness 20 (the ratio of the observed area to the area of a circle with a diameter equal to the Feret diameter)-were estimated for each particle. We used a lower cutoff for particle identification of 335 nm 2 , which corresponds to the smallest spherical particle that the MALS detector can identify, based on manufacturer specifications (8 nm nominal radius of gyration).…”

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 99%

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

Trueman

¹

,

Locsin

²

,

Doré

³

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.

show abstract

“…Images were scaled and then processed using ImageJ 1.53k 19 by thresholding to differentiate particles from the background. Two metrics-the Feret diameter (the maximum of all transects across each particle perimeter) and the ASTM roundness 20 (the ratio of the observed area to the area of a circle with a diameter equal to the Feret diameter)-were estimated for each particle. We used a lower cutoff for particle identification of 335 nm 2 , which corresponds to the smallest spherical particle that the MALS detector can identify, based on manufacturer specifications (8 nm nominal radius of gyration).…”

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 99%

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

Trueman

¹

,

Locsin

²

,

Doré

³

et al. 2022

Preprint

0

View full text Add to dashboard Cite

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.

show abstract

Evaluation of Roundness Parameters in Use for Sand

Cited by 42 publications

References 36 publications

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

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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