A Collection Manifold for Multilevel Ground‐water Sampling Devices

Hitchman, S. P.

doi:10.1111/j.1745-6584.1988.tb00398.x

Cited by 9 publications

(4 citation statements)

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“…Special drilling and sampling methods were developed to minimize disturbance of the aquifer during the emplacement of instrumentation [3], Groundwater was re-circulated between two boreholes 3.41 m apart and the tracers were released in a third "on-line" borehole 0.94 m from the recharge well ( Figure 1). The movement of radiotracers was monitored by removing groundwater from three multi-level sampler installations, using a vacuum extraction system [4], In addition, tracer migration was monitored by gamma probes connected to a multi-channel analyser and which, under computer control, ranged vertically in three blank tubes inserted into the aquifer.…”

Section: Construction and Characterisation Of The Test Arraymentioning

confidence: 99%

“…Batch sorption tests showed that acetate had no effect on the sorption of Co but the strong ligand EDTA reduced the distribution ratio. Supporting speciation modelling using PHREEQE showed that EDTA concentrations in excess of 3 mg/1 would be needed to complex 90% of Co added at 1.34 χ 10~1 0 M. 4. When a complex of cobalt-EDTA passed through a repacked sand column it was slightly retarded with a retardation factor of 1.1 and underwent some attenuation.…”

Section: Overall Conclusionmentioning

confidence: 99%

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The Influence of Organics in Field Migration Experiments

et al. 1991

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Within the European Commission's MIRAGE II research programme, attention has been focused on the potential for natural and anthropogenic organic compounds to complex and mobilize radionuclides. As part of this study, an array of boreholes has been constructed in a shallow confined glacial sand aquifer at Drigg in Cumbria, so that in situ radio-tracer tests can be performed in the presence of organics, under controlled conditions of groundwater flow. The effect of organics on radionuclide mobility was also studied in the laboratory using batch sorption and column experiments, and the results used to predict the outcome of a field test with the Co-EDTA complex.

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Section: Construction and Characterisation Of The Test Arraymentioning

confidence: 99%

Section: Overall Conclusionmentioning

confidence: 99%

The Influence of Organics in Field Migration Experiments

et al. 1991

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“…Instruments can be equipped Johnson (1982) ,'rodc,'m also be with automatic data collection systems. Data loggers adapted for ground water ,,;ampling (Hitchman, 1988). are commercially available for each type of instrument.…”

Section: Frequencymentioning

confidence: 99%

Low-level radioactive waste disposal facility closure

Ferns¹,

Otis²,

Marts³

et al. 1990

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This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their Washington, DC 20555 employees, makes any warranty, express or implied, or assumes any legal liability or responsi-NRC FIN A6853 hility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

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“…Groundwater samples were collected using a peristaltic pump on a 2 to 3 week schedule. Initially, ports were sampled simultaneously using a vacuum distribution manifold and filter flasks for each sampling port (Hitchman, 1988). However, due to the turbidity of groundwater samples, dissolved 02 measurements were made using a dissolved 02 meter with a polarographic probe.…”

Section: Methodsmentioning

confidence: 99%

Assessing the role of geology for nitrate fate and transport in groundwater beneath riparian buffers

Wineland¹

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Riparian buffers have been shown to remove nitrate from groundwater, but the processes controlling removal are not well documented. Previous research at the Risdal Farm in the Bear Creek watershed in central Iowa suggests that geology influences groundwater velocity, residence time, denitrification rate, and ultimately how well the buffer functions. The research area for this study is the entire Bear Creek watershed, a 7,656 ha watershed with> 85 percent row crops. A multi-electrode electrical resistivity imaging system was used to characterize the extent and distribution of alluvial materials beneath buffers. Seven locations were selected for further groundwater investigations based on resistivity data and buffer maturity. A method for the construction, installation and monitoring of multilevel piezometers was developed for collection of hydrogeologic data in shallow alluvial sediments. Hydraulic gradient and hydraulic conductivity data from piezometers were used to assess controlling factors on nitrate removal in buffers. Buffers at the JRS, LSW, and TE sites both consistently removed over 95 percent of nitrate. The RRS and LSE sites often had little effect on nitrate removal, but occasionally achieved much higher removal rates. Nitrate removal was favored in locations with available dissolved organic carbon and low groundwater velocities (long residence time). Lack of dissolved oxygen in these locations suggests denitrification as the removal mechanism. Based on data from the 6 sites, the water quality benefits of buffers are most dependent on geology, groundwater residence time and geochemical environment and least dependent on the age of the buffer.

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A Collection Manifold for Multilevel Ground‐water Sampling Devices

Abstract: Abstract. A sampling manifold has been developed that allows the rapid collection of ground water from multilevel samplers during tracer tests. Its reliability was proven in an experiment lasting 51 days.

Cited by 9 publications

References 1 publication

The Influence of Organics in Field Migration Experiments

The Influence of Organics in Field Migration Experiments

Low-level radioactive waste disposal facility closure

Assessing the role of geology for nitrate fate and transport in groundwater beneath riparian buffers

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