| Abstract: | The purpose of Reston Stable Isotope Laboratory Lab (RSIL) Code 1800 is to determine the δ(34S/32S), abbreviated as δ34S, 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 SO2 gas. The combustion is quantitative; no isotopic fractionation is involved. Samples are placed in tin capsules and loaded into a Costech Zero-Blank Autosampler on the EA. Under computer control, samples are dropped into a heated tube reaction tube that combines both the oxidation and the reduction reactions. The combustion takes place in a He 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 He 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 He for sample dilution. The IRMS is a Thermo-Finnigan DeltaPlus 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 SO2 are as follows: m/z 64 = SO2 = 32S16O16O; and m/z 66 = SO2 = 34S16O16O primarily. |
| Genre: | USGS Numbered Series |
| ProdID: | 79778 |
| Citation Author: | Revesz, Kinga; Coplen, Tyler B. |
| Citation Contributing Office: | Reston Stable Isotope Laboratory |
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| Citation Edition: | Version 1.2, August 2012 (Version 1.1 2007) |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | viii, 31 p.; ill.; Appendices |
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| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Techniques and Methods |
| Citation Series Code: | TM |
| Citation Series Number: | 10-C4 |
| Citation Search Results Text: | Determination of the δ34S of Total Sulfur in Solids: RSIL Lab Code 1800; 2006; TM; 10-C4; Revesz, Kinga; Coplen, Tyler B. |
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| Citation Year: | 2006 |
| Type: | citation/reference |
| Text: | Determination of the δ34S of Total Sulfur in Solids: RSIL Lab Code 1800; 2006; TM; 10-C4; Revesz, Kinga; Coplen, Tyler B. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/tm_10_C4.gif |
| URL (INDEX PAGE): | http://pubs.usgs.gov/tm/10c4/ |
| Date Other: | Sun, 1 Jan 2006 00:00 -0600 |
| Publisher: | U.S. Geological Survey |
