Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 15 of 15 for “"mercury species"”.
-
Mercury species in natural gas condensate
The presence of ultra-trace levels of mercury in industrial gas and condensate streams is a cause of both environmental and production concern. The toxic nature of the element, in all forms, together with its ability to shut-down large processing plants dictates a need for its accurate and precise …
-
Detection of vapor phase mercury species by laser fluorescence methods
Elemental and compound mercury are often both volatile and air stable. Several mercury species emissions have been identified in off-gases from industrial processes. The high toxicity of mercury species and the presence of mercury species in municipal waste and coal have prompted a demand for a …
-
Atmospheric Mercury Species In Northern Mississippi: Concentrations, Sources, Temporal Patterns, And Soil-Air Exchange
Mercury is a highly toxic element that is found both naturally and as an introduced contaminant in the environment. The majority of Mercury released to the environment is into the atmosphere, where because of its high volatility and long residence time is dispersed globally. In order to better …
-
Spatial and Temporal Distribution of Speciated Atmospheric Mercury in Southeastern Texas
… emissions to the levels of atmospheric mercury in both urban and coastal settings of southeastern Texas. Speciated atmospheric mercury measurements were obtained from the ideally located University of Houston Moody Tower and University of Houston Coastal Center from March 22, 2012- June …
-
Application of diffusive gradient in thin-film passive samplers to assess mercury availability and mobility in a fresh water river system
The accurate measurement of mercury in sediment porewater is a challenge using conventional sampling techniques which commonly require removal of sediment, transportation, and processing. Passive sampling is an alternative technique that measures sediment porewater concentrations in-situ and …
-
Field sampling and flow injection strategies for trace analysis and element speciation.
… measurement capability for key trace elements (mercury, lead and chromium) by devising an integrated analytical approach that links the sample collection, sample preservation and laboratory measurements in an unified manner.An introductory chapter first reviews the occurrence of organometallic …
-
Mercury in hair: Method development and application to population studies.
… of Pregnancy And Childhood, the toxic metal, mercury, is studied in order to assess whether it presents a danger to the development of children in the UK.The development and optimisation of a digestion procedure for the determination of total mercury in hair is described. The procedure chosen …
-
Mechanisms of Microbial Formation and Photodegradation of Methylmercury in the Aquatic Environment
<p>Methylmercury is a bioaccumulative neurotoxin that severely endangers human health. Humans are exposed to methylmercury through consumption of contaminated aquatic fish. To date, effective strategies for preventing and remediating methylmercury contamination have remained elusive, mainly due to …
-
THE DETERMINATION OF TRACE METALS BY CAPILLARY ELECTROPHORESIS
… for the determination of inorganic and organo mercury species as their dithizone sulphonate (DzS) complexes using coated capillary columns is described. The complexes were pre-formed before injection and detection was by direct measurement of the visible absorbance of the complexes. Dithizone …
-
Cardiovascular effects of lead and mercury and their mixtures in rats
… some environmental pollutants, e.g. lead and mercury, can adversely affect cardiovascular health. Despite the increasing amount of knowledge from human and animal studies, cardiovascular effects of lead, mercury species or their mixtures are not well understood. It is also unknown if safe …
-
Investigations of and performance improvements in the mercury thiourea complex ion chromatography method for mercury speciation analysis
… complex ion chromatography (HgTU-IC) method for mercury speciation analysis, first developed at UIUC, was the subject of an in depth investigation aimed at i) understanding the causes of system performance problems, ii) optimizing its chemistry, and iii) coupling it to ICP-MS detection. The new …
-
Use of magnetic nanoparticles for wastewater treatment
… (DDT) and heavy metals like mercury, lead and manganese are among the ubiquitous trace contaminants of marine and freshwater systems. Presence of these contaminants raise concerns as small quantities of the organic chemicals have been shown to be carcinogenic to mammals and …
-
Determination of trace elements in hair for monitoring environmental and occupational exposure
… of antimony, arsenic, cadmium, chromium, lead, mercury and selenium in human hair by ICP-MS were developed. Chemical speciation of mercury and methyl mercury in hair was also achieved using LC-ICP-MS. For the digestion of hair samples the optimum method for these elements was found to be a …
-
ΜΕΛΕΤΗ ΠΡΟΣΔΙΟΡΙΣΜΟΥ ΕΝΩΣΕΩΝ ΥΔΡΑΡΓΥΡΟΥ ΜΕ ΤΗ ΦΑΣΜΑΤΟΜΕΤΡΙΑ ΑΤΟΜΙΚΗΣ ΑΠΟΡΡΟΦΗΣΗΣ ΨΥΧΡΟΥ ΑΤΜΟΥ ΚΑΙ ΒΕΛΤΙΣΤΟΠΟΙΗΣΗ ΜΕ ΠΑΡΑΓΟΝΤΙΚΟ ΣΧΕΔΙΑ...
… ATOMIC ABSORPTION SPECTROMETRY, WHICH IS USED AT MERCURY DETERMINATIONS. THE METHOD WAS OPTIMIZED EITHER AS DIRECT DETERMINATION WITHOUT PRECONCENTRATION AND WITH PRECONCENTRATIONON A AU-PT AMALGAMATOR . IN THE FIRST CASE THE OPTIMIZATION WAS ACHIEVED BY THE APPLICATION OF A COMPLETE FACTORIAL …