Comparison of Ceramic and Polytetrafluoroethene/Quartz Suction Cups for Sampling Inorganic Ions in Soil Solution
Comparison of Ceramic and Polytetrafluoroethene/Quartz Suction Cups for Sampling Inorganic Ions in Soil Solution
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DOI：
10.1080/00103620801925661
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发表时间：
2008-03
影响因子：
1.8
通讯作者：
Jeroen Vandenbruwane;S. De Neve;A. de Schrijver;G. Geudens;K. Verheyen;G. Hofman
中科院分区：
文献类型：
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作者：
Jeroen Vandenbruwane;S. De Neve;A. de Schrijver;G. Geudens;K. Verheyen;G. Hofman
摘要由于广泛使用的陶瓷杯据报道，释放，吸附和过滤溶解的养分从土壤溶液样品，惰性杯制成的聚（三乙烯）（PTFE）经常被提出作为一个更可靠的替代品。在本实验室研究中，对陶瓷杯和PTFE/石英杯进行了比较。PTFE/石英杯最适合pH测量。因为只有陶瓷杯能以令人满意的方式对铵和硝酸盐进行采样，所以推荐使用这种杯型进行氮（N）平衡研究。在大多数情况下，陶瓷杯在采样阳离子[钠（Na+）、钾（K+）、钙（Ca 2+）、镁（Mg 2+）]方面的表现也优于PTFE/石英杯。两种杯型似乎不足以对土壤溶液进行铝（Al 3+）测定。陶瓷杯在低离子浓度下释放出氯化物（Cl−），但与杯外的溶液相比，样品中的硫酸盐（SO 4 2−）浓度几乎保持不变。相比之下，Cl−和SO 4 2−被PTFE/石英杯保留。本研究的总体结论是，PTFE/石英杯在处理土壤溶液中溶解的无机离子的生态研究中，与更广泛使用的陶瓷杯相比，没有明显的优势。
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 (SO4 2−) concentrations remained almost unaltered in the sample as compared to the solution outside the cup. In contrast, Cl− and SO4 2− 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.