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2 edition of Assessment of strategies for measuring chloride-36 in natural samples. found in the catalog.

Assessment of strategies for measuring chloride-36 in natural samples.

Jonathan P. Doupe

Assessment of strategies for measuring chloride-36 in natural samples.

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Published .
Written in English


About the Edition

The cosmogenic isotope 36Cl (half-life of 3.01 x 105 years) has been applied to problems in hydrogeology and surface exposure dating for a number of years. However its measurement in natural samples is complicated by its low abundance with respect to the stable isotopes of chlorine (36Cl/Cl = 10-10 to 10-16), and the presence of the isobar 36S (0.02% of S). Conventional Accelerator Mass Spectrometry (AMS) techniques for measuring 36Cl require tandem accelerators of 5 MV or larger. Only these machines can accelerate the 36Sn+ ions to high enough energies for them to be separated in gas-filled magnets, or in dE/dx analysis in the final detector. The present work investigates the possibility of 36Cl analysis on smaller, more economical machines. It is demonstrated that 36Ar3+ and 36S3+ ions, generated from argon and SF6 gas within the 2 MV tandem accelerator at the University of Toronto, will not preclude 36Cl measurements. A gas ion source was developed in which Cl- ions are created when a negative ion beam transfers its charge to the gas ICl, and the Cl- ions are then extracted. The efficiency of Cl- generation was about 20% for a Cu- beam. Because of the instability of sulphur iodide (S2I2) at room temperature, and the resonant charge transfer reaction to ICl, this gas source should discriminate against 36S. It was also shown that in the collision of S - and Cl- ions with NO2 gas at about one milliTorr pressure, the S- was attenuated by about two orders of magnitude relative to the Cl-. Finally, the 25 MV Holifield accelerator at Oak Ridge, Tennessee was used to measure 36Cl with the completely stripped 36Cl 17+ ion. Because the completely stripped sulphur species has a charge of 16+, it was possible to separate this isobar from 36Cl in a magnet. These measurements detected 36Cl in seawater for the first time, and showed, unexpectedly, that the 36Cl/Cl ratio varies in the world ocean.

The Physical Object
Pagination162 leaves.
Number of Pages162
ID Numbers
Open LibraryOL20339219M
ISBN 100612917444

Prudent practice in the laboratory is mandated by law and enforceable through citations. Traditionally, the hazardous properties of chemicals have been regarded as a significant factor in planning experiments only if extreme toxicity or danger from explosion was apparent. It is true, however, that some risks eg, in sport seem more acceptable to the public at large than others eg, nuclear power. SUs may cause significant hypoglycemia. Today we zeta. These are of particular use with prodrugs for oral administration.

Based on Ms. Due to the process characteristics, mercury can be emitted from the process through air, water, wastes and in the products. The base analogues typically are substituted, usually at extracyclic N atoms, or are the aza or deaza analogues of the naturally occuring base scaffolds. Today the Galeries Lafayette network extends to 63 stores, including 58 in France and five around the world in Berlin, Casablanca, Dubai, Jakarta and Beijing. Chapter 5 presents the techniques and the emission and consumption levels that are considered to be compatible with BAT in a general sense. Use of carbon tetrachloride-free chlorine liquefaction and purification processes.

Tel: Pharmacist contacted Dr. Autoclaving or use of a disinfectant may be needed to reduce the hazard of biological waste during storage. Many types of biological fluid waste containing chemical components can be disposed of in the sanitary sewer, but local approval may be required. The current draft of the new programme of study for Key Stage 3 states that: Pupils should be able to: Assess risks and work safely in the laboratory, field and workplace, … It remains clear that pupils must be taught about health, safety and risk assessment in their study of secondary science. NRC regulations for the management of low-activity radioactive waste that poses no significant risk to the public or the environment.


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Assessment of strategies for measuring chloride-36 in natural samples. book

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Student Safety Sheets

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We reasoned that hERG inhibition associated with compound 1 might be due to the presence of the basic piperidine linker (calculated pK a of ).

As seen in Table 1, replacement of the piperidine ring by a less basic piperazine ring at position 6 of the imidazo[1,2-a]pyridine scaffold for compounds 2 and 4 resulted in a lowering of hERG inhibition while retaining similar potency on ATX Cited by: