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Determination of the 34S of Total Sulfur in Solids; RSIL Lab Code 1800

Determination of the 34S of Total Sulfur in Solids; RSIL Lab Code 1800


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About the Book

The purpose of the Reston Stable Isotope Laboratory (RSIL) lab code 1800 is to determine the (34S/32S), abbreviated as 34S, of total sulfur in a solid sample. A Carlo Erba NC 2500 elemental analyzer (EA) is used to convert total sulfur in a solid sample into SO2 gas. The EA is connected to a continuous flow isotope-ratio mass spectrometer (CF-IRMS), which determines the relative difference in stable sulfur isotope-amount ratio (34S/32S) of the product SO gas. The combustion is quantitative; no isotopic fractionation is involved. Samples are placed in2tin capsules and loaded into a Costech Zero-Blank Autosampler on the EA. Under computer control, samples are dropped into a heated reaction tube that combines both the oxidation and the reduction reactions. The combustion takes place in a helium atmosphere that contains an excess of oxygen gas at the oxidation zone at the top of the reaction tube. Combustion products are transported by a helium carrier through the reduction zone at the bottom of the reaction tube to remove excess oxygen and through a separate drying tube to remove any water. The gas- phase products, mainly CO2, N2, and SO2, are separated by a gas chromatograph (GC). The gas is then introduced into the isotope-ratio mass spectrometer (IRMS) through a Thermo-Finnigan ConFlo II interface, which also is used to inject SO2 reference gas and helium for sample dilution. The IRMS is a Thermo Delta V Plus CF-IRMS. It has a universal triple collector with two wide cups and a narrow cup in the middle. It is capable of measuring mass/charge (m/z) 64 and 66 simultaneously. The ion beams from SO are as follows: m/z 64 = SO = 32S16O16O; and m/z 66 = SO = 34S16O16O primarily. 222


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Product Details
  • ISBN-13: 9781500297671
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 280 mm
  • No of Pages: 40
  • Series Title: English
  • Weight: 168 gr
  • ISBN-10: 1500297674
  • Publisher Date: 23 Jun 2014
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 2 mm
  • Width: 216 mm


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Determination of the 34S of Total Sulfur in Solids; RSIL Lab Code 1800
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