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Comparison of ceramic and polytetrafluoroethene/quartz suction cups for sampling inorganic ions in soil solution

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Abstract
Because the widely used ceramic cups are reported to release, adsorb, and filter dissolved nutrients from soil solution samples, inert cups made of poly(tetrafluoroethene) (PTFE) are frequently proposed as a more reliable alternative. A ceramic and a PTFE/quartz cup were compared with each other in this laboratory study. The PTFE/quartz cup was the most suited for pH measurements. Because only the ceramic cup samples both ammonium and nitrate in a satisfactory way, this cup type is recommended for nitrogen (N) balance studies. In most cases, the ceramic cup also performed better in sampling cations [sodium (Na+), potassium (K+), calcium (Ca2+), magnesium (Mg2+)] than the PTFE/quartz cup. Both cup types seemed inadequate to sample soil solution for aluminum (Al3+) determinations. The ceramic cups released chloride (Cl-) at low ion concentrations, but sulfate (SO42-) concentrations remained almost unaltered in the sample as compared to the solution outside the cup. In contrast, Cl- and SO42- were retained by the PTFE/quartz cups. The overall conclusion of this study is that PTFE/quartz cups have no clear advantages over the more widely used ceramic cups for use in ecological studies dealing with dissolved inorganic ions in the soil solution.
Keywords
WATER SAMPLERS, TENSION LYSIMETERS, FOREST SOILS, TRACE-METALS, ADSORPTION, EXTRACTION, CHEMISTRY, ceramic, porous suction cups, inorganic ions, PTFE/quartz, soil solution, Teflon

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Chicago
Vandenbruwane, Jeroen, Stefaan De Neve, An De Schrijver, Guy Geudens, Kris Verheyen, and Georges Hofman. 2008. “Comparison of Ceramic and Polytetrafluoroethene/quartz Suction Cups for Sampling Inorganic Ions in Soil Solution.” Communications in Soil Science and Plant Analysis 39 (7-8): 1105–1121.
APA
Vandenbruwane, Jeroen, De Neve, S., De Schrijver, A., Geudens, G., Verheyen, K., & Hofman, G. (2008). Comparison of ceramic and polytetrafluoroethene/quartz suction cups for sampling inorganic ions in soil solution. COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS, 39(7-8), 1105–1121.
Vancouver
1.
Vandenbruwane J, De Neve S, De Schrijver A, Geudens G, Verheyen K, Hofman G. Comparison of ceramic and polytetrafluoroethene/quartz suction cups for sampling inorganic ions in soil solution. COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS. 2008;39(7-8):1105–21.
MLA
Vandenbruwane, Jeroen, Stefaan De Neve, An De Schrijver, et al. “Comparison of Ceramic and Polytetrafluoroethene/quartz Suction Cups for Sampling Inorganic Ions in Soil Solution.” COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS 39.7-8 (2008): 1105–1121. Print.
@article{601048,
  abstract     = {Because the widely used ceramic cups are reported to release, adsorb, and filter dissolved nutrients from soil solution samples, inert cups made of poly(tetrafluoroethene) (PTFE) are frequently proposed as a more reliable alternative. A ceramic and a PTFE/quartz cup were compared with each other in this laboratory study. The PTFE/quartz cup was the most suited for pH measurements. Because only the ceramic cup samples both ammonium and nitrate in a satisfactory way, this cup type is recommended for nitrogen (N) balance studies. In most cases, the ceramic cup also performed better in sampling cations [sodium (Na+), potassium (K+), calcium (Ca2+), magnesium (Mg2+)] than the PTFE/quartz cup. Both cup types seemed inadequate to sample soil solution for aluminum (Al3+) determinations. The ceramic cups released chloride (Cl-) at low ion concentrations, but sulfate (SO42-) concentrations remained almost unaltered in the sample as compared to the solution outside the cup. In contrast, Cl- and SO42- were retained by the PTFE/quartz cups. The overall conclusion of this study is that PTFE/quartz cups have no clear advantages over the more widely used ceramic cups for use in ecological studies dealing with dissolved inorganic ions in the soil solution.},
  author       = {Vandenbruwane, Jeroen and De Neve, Stefaan and De Schrijver, An and Geudens, Guy and Verheyen, Kris and Hofman, Georges},
  issn         = {0010-3624},
  journal      = {COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS},
  keyword      = {WATER SAMPLERS,TENSION LYSIMETERS,FOREST SOILS,TRACE-METALS,ADSORPTION,EXTRACTION,CHEMISTRY,ceramic,porous suction cups,inorganic ions,PTFE/quartz,soil solution,Teflon},
  language     = {eng},
  number       = {7-8},
  pages        = {1105--1121},
  title        = {Comparison of ceramic and polytetrafluoroethene/quartz suction cups for sampling inorganic ions in soil solution},
  url          = {http://dx.doi.org/10.1080/00103620801925661},
  volume       = {39},
  year         = {2008},
}

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