Sulfur and Selenium Isotope Separation by Distillation. [ch3SH, Dimethy Selenide, H2Se].

Sulfur and Selenium Isotope Separation by Distillation. [ch3SH, Dimethy Selenide, H2Se].
Author:
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Total Pages:
Release: 1988
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Sulfur and selenium isotopes are used for labeled compounds and as precursors for radioisotope production; however, both limited availability and high costs are problems. A new method is needed for large-scale separation of these isotopes. Experimental distillation columns were used to measure isotopic separations for sulfur and selenium compounds. The maximum total isotope separation of 32S vs. 34S were 1.127 for H2S, 1.048 for COS, 0.838 for SF4, and 1.058 for CH3SH. Relative volatilities of 32S vs. 34S are 1.0006 for COS and 0.9976 for SF4. There is a reverse isotope effect for carbon in COS. No isotopic separation was observed for dimethyl selenide. The lower mass selenium isotopes in H2Se are more volatile. Distillation is a promising method for separating sulfur isotopes on a production scale. Existing distillation technology produced separated isotopes with an effect similar to that found for sulfur in SF4. 8 refs., 2 tabs.

Isotopic Analysis of Dimethyl Selenide

Isotopic Analysis of Dimethyl Selenide
Author:
Publisher:
Total Pages:
Release: 1984
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ISBN:

The separated isotopes of selenium may be used as stable precursors for the synthesis of radio-bromine isotopes for positron emitter tomographic diagnostics. As part of a project to find a suitable distillation method for separating selenium isotopes, the need arose to study the organo-metallic compound dimethyl selenide. The complexity of the mass spectrum tended to obscure the isotope effect with 35 major peaks being measured. A least-squares fitting procedure was developed for the 13 fragmentation factors as well as a few hundredths of a percent, yet no sizeable separation was observed across the test column. According to these measurements, the effect of one mass unit increase in the selenium isotope results in less than 10 ppM in the vapor pressure of the compound. 4 figures.

Sulfur-isotope Separation by Distillation

Sulfur-isotope Separation by Distillation
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Release: 1982
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Sulfur-isotope separation by low-temperature distillation of hydrogen sulfide was studied in an 8-m, 25-mm diameter distillation column. Column temperature was controlled by a propane-propylene heat pipe. Column packing HETP was measured using nitric oxide in the column. The column was operated at pressures from 45 to 125 kPa. The relative volatility of S-32 vs. S-34 varied from 1.0008 to 1.0014.

Bioremediation of Selenium Contaminated Wastewater

Bioremediation of Selenium Contaminated Wastewater
Author: Eric D van Hullebusch
Publisher: Springer
Total Pages: 134
Release: 2017-09-02
Genre: Technology & Engineering
ISBN: 3319578316

This book features the reduction and removal of selenium in wastewater via bioremediation. Arranged over five chapters, this book provides information regarding the interaction between micro-organisms and selenium, and it also explains the biogeochemistry of selenium in engineered ecosystems designed for wastewater treatment. The analytical approaches currently adopted by the scientific community are also described and discussed. Readers will find examples of the biological treatment of selenium contaminated wastewater, and discover a concise overview of selenium removal processes that are currently implemented at lab-scale as well as at industrial scale.

Science Data Booklet

Science Data Booklet
Author: Manjunath.R
Publisher: Manjunath.R
Total Pages: 908
Release: 2020-07-11
Genre: Antiques & Collectibles
ISBN:

The Scientific Compendium: A Comprehensive Reference for Data and Formulas The "Science Data Booklet" is an essential companion for students, researchers, and science enthusiasts alike, providing a comprehensive collection of key scientific data and information. This meticulously curated reference book serves as a treasure trove of facts, equations, and formulas from various scientific disciplines, designed to empower readers with the tools they need to excel in their scientific pursuits. Inside this invaluable compendium, readers will discover a wealth of information spanning the realms of physics, chemistry, biology, astronomy, and more. From fundamental constants to conversion factors, this book offers a concise and easily accessible compilation of scientific knowledge that is essential for scientific investigations, experiments, and calculations. Whether you are a student preparing for exams, a researcher seeking quick access to vital data, or a science enthusiast eager to delve deeper into the world of scientific knowledge, this book is your indispensable companion. With the help of this book, you can access a plethora of scientific knowledge at your fingertips, anytime and anywhere. In a world increasingly driven by scientific advancements, the "Science Data Booklet" serves as an invaluable resource for anyone seeking to navigate the complexities of scientific data. This book is not only a reference guide but also a catalyst for curiosity, inspiring readers to explore the wonders of the natural world and embark on their own scientific journeys. Unlock the power of scientific knowledge with the "Science Data Booklet" and embark on a fascinating voyage of discovery, innovation, and understanding.

Annual Report FY...

Annual Report FY...
Author: National Institutes of Health (U.S.). Biomedical Engineering and Instrumentation Branch
Publisher:
Total Pages: 140
Release:
Genre: Biomedical engineering
ISBN:

A Comprehensive Guide to the Hazardous Properties of Chemical Substances

A Comprehensive Guide to the Hazardous Properties of Chemical Substances
Author: Pradyot Patnaik
Publisher: John Wiley & Sons
Total Pages: 1086
Release: 2007-07-27
Genre: Technology & Engineering
ISBN: 0470134941

The definitive guide to the hazardous properties of chemical compounds Correlating chemical structure with toxicity to humans and the environment, and the chemical structure of compounds to their hazardous properties, A Comprehensive Guide to the Hazardous Properties of Chemical Substances, Third Edition allows users to assess the toxicity of a substance even when no experimental data exists. Thus, it bridges the gap between hazardous materials and chemistry. Extensively updated and expanded, this reference: Examines organics, metals and inorganics, industrial solvents, common gases, particulates, explosives, and radioactive substances, covering everything from toxicity and carcinogenicity to flammability and explosive reactivity to handling and disposal practices Arranges hazardous chemical substances according to their chemical structures and functional groups for easy reference Includes updated information on the toxic, flammable, and explosive properties of chemical substances Covers additional metals in the chapters on toxic and reactive metals Updates the threshold exposure limits in the workplace air for a number of substances Features the latest information on industrial solvents and toxic and flammable gases Includes numerous tables, formulas, and a glossary for quick reference Because it provides information that enables those with a chemistry background to perform assessments without prior data, this comprehensive reference appeals to chemists, chemical engineers, toxicologists, and forensic scientists, as well as industrial hygienists, occupational physicians, Hazmat professionals, and others in related fields.