No description available.

No description available.

Rasmussen et al. (2001) observed that Sb concentrations were enriched in household dust relative to outdoor garden soil samples and suspected the enrichment may be due to anthropogenic internal sources. Antimony trioxide (Sb2O3) is commonly found in various halogen flame-retardants and is a suspected carcinogen (IARC, 1989). North Americans spend a significant proportion of their time indoors, and are frequently exposed to dust. Therefore, characterizing potentially harmful metal(loid)s (i.e. Sb2O3) has become of increasing priority to various governmental agencies. A combination of micro-analytical synchrotron techniques (micro X-ray fluorescence (µXRF), micro X-ray diffraction (µXRD), micro X-ray absorption near-edge spectroscopy (µXANES)) and environmental scanning electron microscopy (ESEM) were used to characterize five archived samples provided by Health Canada. Two samples were in the 90th percentile for Sb content in household dust from a suite of 50 houses studied by Rasmussen et al. (2001). The corresponding garden soils of these houses were also analysed. The fifth sample was a children’s bedroom from a house studied in detail by Walker et al. (2010). Synchrotron microanalysis of Sb presents many challenges, given its high absorption energy (31 KeV), and the relatively low concentrations and small particles in house dust. An appropriate experimental set-up was optimized after several trials. Antimony within household dust is currently not of toxicological concern (EU, 2008). Micro-XRF maps of household dust samples and corresponding garden soils from sample to sample displayed distinct element correlations of Sb with other elements. This suggests that Sb species present within homes are not restricted to a single source. Potential sources are Pb based or Sb containing pigments (Naples Yellow), metal alloys and possibly flame-retardants. The lack of correlation between Sb hot spots in the garden soil sample compared to the household dust suggests the source of interior Sb may not be external. A collaborative project with another student in the Environmental Studies Masters program was conducted to examine the potential for interdisciplinary work. Effective communication was the greatest barrier but there was success in the creation of a forum where people could critically think about the various nuances of household dust. / Thesis (Master, Environmental Studies) -- Queen's University, 2010-12-24 14:37:03.016

No description available.

Various bis-dmio and -dmit zincate complexes, [Q]<SUB>2</SUB>[Zn(dmio)<SUB>2</SUB>] [Q = NEt<SUB>4</SUB>, 1,4-dmp, Ph<SUB>4</SUB>P and FcCH<SUB>2</SUB>NMe<SUB>3</SUB>] and [Q]<SUB>2</SUB>[Zn(dmit)<SUB>2</SUB>] [Q = FcCH<SUB>2</SUB>NMe<SUB>3</SUB>], have been prepared and characterised by IR, <SUP>1</SUP>H and <SUP>13</SUP>C-NMR spectral and elemental analysis data. The solid state structure of [FcCH<SUB>2</SUB>NMe<SUB>3</SUB>]<SUB>2</SUB>[Zn(dmio)<SUB>2</SUB>] was determined by X-ray crystallography. The complexes, [Q]<SUB>2</SUB>[Zn(dmio)<SUB>2</SUB>] and [Q]<SUB>2</SUB>[Zn(dmit)<SUB>2</SUB>], have been further used as precursors of various dmio and dmit complexes of tin (IV) and antimony (III) and (V). Metal exchange reactions with these complexes have also been investigated. The neutral tin compounds, R<SUB>2</SUB>Sn(dmio) [RR' = Me<SUB>2</SUB>, Et<SUB>2</SUB>, Bu<SUB>2</SUB>, Ph<SUB>2</SUB> and MeO<SUB>2</SUB>CH<SUB>2</SUB>CH<SUB>2</SUB>] have been synthesised and characterised by IR, <SUP>1</SUP>H, <SUP>13</SUP>C and <SUP>119</SUP>Sn-NMR spectral and elemental analysis data and for Me<SUB>2</SUB>Sn(dmio) by X-ray diffraction. The compounds, [Q][R<SUB>2</SUB>Sn(dmio)X] [Q = NEt<SUB>4</SUB>, FcCH<SUB>2</SUB>NMe<SUB>3</SUB> ; R = Ph, Et ; X = Cl] and [Q][R<SUB>2</SUB>(dmit)X] [Q = FcCH<SUB>2</SUB>NMe<SUB>3</SUB> ; R = Ph ; X = Cl], have been prepared and halide (X) exchange reactions in [Q][R<SUB>2</SUB>Sn(dmio)X] [Q = NEt<SUB>4</SUB> ; R=Ph ; X=Cl] have been investigated using alkali metal halides and pseudohalides [NaI, NaBr and NaSCN]. The solid state structures of [NEt<SUB>4</SUB>][Ph<SUB>2</SUB>Sn(dmio)Cl], [NEt<SUB>4</SUB>][Ph<SUB>2</SUB>Sn(dmio)-SCN] and [NEt<SUB>4</SUB>][NEt<SUB>4</SUB>][Et<SUB>2</SUB>Sn(dmio)Br] have been determined. The monoestertin bis-dmio complexes, [Q][MeO<SUB>2</SUB>CCH<SUB>2</SUB>CH<SUB>2</SUB>Sn(dmio)<SUB>2</SUB>] [Q = NEt<SUB>4</SUB>, 1,4-dmp and Ph<SUB>4</SUB>P] and the neutral diestertin dmio complex, [(MeO<SUB>2</SUB>CCH<SUB>2</SUB>CH<SUB>2</SUB>)<SUB>2-</SUB>Sn(dmio)], have been synthesised and characterised. The solid state structure of [NEt<SUB>4</SUB>][MeO<SUB>2</SUB>CCH<SUB>2</SUB>CH<SUB>2</SUB>Sn(dmio)<SUB>2</SUB>] has been determined. Also, the tris-dmio and dmit complexes, [Q]<SUB>2</SUB>[Sn(dmit)<SUB>3</SUB>] [Q = NEt<SUB>4</SUB>, 1,4-dmp, Ph<SUB>4</SUB>P and FcCH<SUB>2</SUB>NME<SUB>3</SUB>] and [Q][Sn(dmit)<SUB>3</SUB>] [Q = FcCH<SUB>2</SUB>NMe<SUB>3</SUB>] have been prepared and characterised. The antimony (III) bis-dmio complexes, [Q][Sb<SUP>III</SUP>(dmio)<SUB>2</SUB>] [Q = NEt<SUB>4</SUB>, 1,4-dmp, Ph<SUB>4</SUB>P and FcCH<SUB>2</SUB>NMe<SUB>3</SUB>], and antimony (III) bis-dmit complex, [Q][Sb<SUP>III</SUP>(dmio)<SUB>2</SUB>] [Q = FcCH<SUB>2</SUB>NMe<SUB>3</SUB>], have been synthesised and fully characterised by IR, <SUP>1</SUP>H and <SUP>13</SUP>C-NMR spectral and elemental analysis data.

Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1908. / Mr. Hase and Mr. French both earned a Bachelor of Science degree in General Science, granted in 1908, determined from "1874-1999 MSM-UMR Alumni Directory". The entire thesis text is included in file. Typescript. Illustrated by authors. Title from title screen of thesis/dissertation PDF file (viewed March 31, 2009)

Thesis (Ph. D.)--University of Michigan, 1921.

Thesis (Ph. D.)--University of Michigan, 1921.

Thesis (Ph. D.)--University of Michigan, 1921.

Thesis (Ph. D.)--University of Pennsylvania, 1911.