Investigation into the determination of trimethylarsine in natural gas and its partitioning into gas and condensate phases using (cryotrapping)/gas chromatography coupled to inductively coupled plasma mass spectrometry and liquid/solid sorption techniques

Eva Maria Krupp, C. Johnson, C. Rechsteiner, M. Moir, D. Leong, Jorg Feldmann

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Abstract

Speciation of trialkylated arsenic compounds in natural gas, pressurized and stable condensate samples from the same gas well was performed using (Cryotrapping) Gas Chromatography-Inductively Coupled Plasma Mass Spectrometry. The major species in all phases investigated was found to be trimethylarsine with a highest concentration of 17.8 ng/L (As) in the gas phase and 33.2 mu g/L (As) in the stable condensate phase. The highest amount of trimethylarsine (121 mu g/L (As)) was found in the pressurized condensate, along with trace amounts of non-identified higher alkvlated arsines. Volatile arsenic species in natural gas and its related products cause concern with regards to environment, safety, occupational health and gas processing. Therefore, interest lies in a fast and simple field method for the determination of volatile arsenicals. Here, we use simple liquid and solid sorption techniques, namely absorption in silver nitrate solution and adsorption on silver nitrate impregnated silica gel tubes followed by total arsenic determination as a promising tool for field monitoring of volatile arsenicals in natural gas and gas condensates. Preliminary results obtained for the sorption-based methods show that around 70% of the arsenic is determined with these methods in comparison to volatile arsenic determination using GC-ICP-MS. Furthermore, an inter-laboratory- and inter-method comparison was performed using silver nitrate impregnated silica tubes on 14 different as samples with concentrations varying from below 1 to 1000 mu g As/m(3) natural gas. The results obtained from the two laboratories differ in a range of 10 to 60%, but agree within the order of magnitude, which is satisfactory for Our purposes.

Original languageEnglish
Pages (from-to)970-977
Number of pages8
JournalSpectrochimica Acta. Part B: Atomic Spectroscopy
Volume62
Issue number9
Early online date2 Aug 2007
DOIs
Publication statusPublished - Sep 2007

Keywords

  • natural gas
  • gas condensates
  • volatile arsenic
  • TMAs
  • GC-ICP-MS
  • Natural gas
  • Gas condensates
  • Volatile arsenic

Cite this

@article{6fba1c3604af4f828e9f31627810afe1,
title = "Investigation into the determination of trimethylarsine in natural gas and its partitioning into gas and condensate phases using (cryotrapping)/gas chromatography coupled to inductively coupled plasma mass spectrometry and liquid/solid sorption techniques",
abstract = "Speciation of trialkylated arsenic compounds in natural gas, pressurized and stable condensate samples from the same gas well was performed using (Cryotrapping) Gas Chromatography-Inductively Coupled Plasma Mass Spectrometry. The major species in all phases investigated was found to be trimethylarsine with a highest concentration of 17.8 ng/L (As) in the gas phase and 33.2 mu g/L (As) in the stable condensate phase. The highest amount of trimethylarsine (121 mu g/L (As)) was found in the pressurized condensate, along with trace amounts of non-identified higher alkvlated arsines. Volatile arsenic species in natural gas and its related products cause concern with regards to environment, safety, occupational health and gas processing. Therefore, interest lies in a fast and simple field method for the determination of volatile arsenicals. Here, we use simple liquid and solid sorption techniques, namely absorption in silver nitrate solution and adsorption on silver nitrate impregnated silica gel tubes followed by total arsenic determination as a promising tool for field monitoring of volatile arsenicals in natural gas and gas condensates. Preliminary results obtained for the sorption-based methods show that around 70{\%} of the arsenic is determined with these methods in comparison to volatile arsenic determination using GC-ICP-MS. Furthermore, an inter-laboratory- and inter-method comparison was performed using silver nitrate impregnated silica tubes on 14 different as samples with concentrations varying from below 1 to 1000 mu g As/m(3) natural gas. The results obtained from the two laboratories differ in a range of 10 to 60{\%}, but agree within the order of magnitude, which is satisfactory for Our purposes.",
keywords = "natural gas, gas condensates, volatile arsenic, TMAs, GC-ICP-MS, Natural gas, Gas condensates, Volatile arsenic",
author = "Krupp, {Eva Maria} and C. Johnson and C. Rechsteiner and M. Moir and D. Leong and Jorg Feldmann",
year = "2007",
month = "9",
doi = "10.1016/j.sab.2007.07.009",
language = "English",
volume = "62",
pages = "970--977",
journal = "Spectrochimica Acta. Part B: Atomic Spectroscopy",
issn = "0584-8547",
publisher = "PERGAMON-ELSEVIER SCIENCE LTD",
number = "9",

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TY - JOUR

T1 - Investigation into the determination of trimethylarsine in natural gas and its partitioning into gas and condensate phases using (cryotrapping)/gas chromatography coupled to inductively coupled plasma mass spectrometry and liquid/solid sorption techniques

AU - Krupp, Eva Maria

AU - Johnson, C.

AU - Rechsteiner, C.

AU - Moir, M.

AU - Leong, D.

AU - Feldmann, Jorg

PY - 2007/9

Y1 - 2007/9

N2 - Speciation of trialkylated arsenic compounds in natural gas, pressurized and stable condensate samples from the same gas well was performed using (Cryotrapping) Gas Chromatography-Inductively Coupled Plasma Mass Spectrometry. The major species in all phases investigated was found to be trimethylarsine with a highest concentration of 17.8 ng/L (As) in the gas phase and 33.2 mu g/L (As) in the stable condensate phase. The highest amount of trimethylarsine (121 mu g/L (As)) was found in the pressurized condensate, along with trace amounts of non-identified higher alkvlated arsines. Volatile arsenic species in natural gas and its related products cause concern with regards to environment, safety, occupational health and gas processing. Therefore, interest lies in a fast and simple field method for the determination of volatile arsenicals. Here, we use simple liquid and solid sorption techniques, namely absorption in silver nitrate solution and adsorption on silver nitrate impregnated silica gel tubes followed by total arsenic determination as a promising tool for field monitoring of volatile arsenicals in natural gas and gas condensates. Preliminary results obtained for the sorption-based methods show that around 70% of the arsenic is determined with these methods in comparison to volatile arsenic determination using GC-ICP-MS. Furthermore, an inter-laboratory- and inter-method comparison was performed using silver nitrate impregnated silica tubes on 14 different as samples with concentrations varying from below 1 to 1000 mu g As/m(3) natural gas. The results obtained from the two laboratories differ in a range of 10 to 60%, but agree within the order of magnitude, which is satisfactory for Our purposes.

AB - Speciation of trialkylated arsenic compounds in natural gas, pressurized and stable condensate samples from the same gas well was performed using (Cryotrapping) Gas Chromatography-Inductively Coupled Plasma Mass Spectrometry. The major species in all phases investigated was found to be trimethylarsine with a highest concentration of 17.8 ng/L (As) in the gas phase and 33.2 mu g/L (As) in the stable condensate phase. The highest amount of trimethylarsine (121 mu g/L (As)) was found in the pressurized condensate, along with trace amounts of non-identified higher alkvlated arsines. Volatile arsenic species in natural gas and its related products cause concern with regards to environment, safety, occupational health and gas processing. Therefore, interest lies in a fast and simple field method for the determination of volatile arsenicals. Here, we use simple liquid and solid sorption techniques, namely absorption in silver nitrate solution and adsorption on silver nitrate impregnated silica gel tubes followed by total arsenic determination as a promising tool for field monitoring of volatile arsenicals in natural gas and gas condensates. Preliminary results obtained for the sorption-based methods show that around 70% of the arsenic is determined with these methods in comparison to volatile arsenic determination using GC-ICP-MS. Furthermore, an inter-laboratory- and inter-method comparison was performed using silver nitrate impregnated silica tubes on 14 different as samples with concentrations varying from below 1 to 1000 mu g As/m(3) natural gas. The results obtained from the two laboratories differ in a range of 10 to 60%, but agree within the order of magnitude, which is satisfactory for Our purposes.

KW - natural gas

KW - gas condensates

KW - volatile arsenic

KW - TMAs

KW - GC-ICP-MS

KW - Natural gas

KW - Gas condensates

KW - Volatile arsenic

U2 - 10.1016/j.sab.2007.07.009

DO - 10.1016/j.sab.2007.07.009

M3 - Article

VL - 62

SP - 970

EP - 977

JO - Spectrochimica Acta. Part B: Atomic Spectroscopy

JF - Spectrochimica Acta. Part B: Atomic Spectroscopy

SN - 0584-8547

IS - 9

ER -