Influence of Piezometer Construction on Groundwater Sampling in Fractured Rock

Kozuskanich, John C.; Novakowski, Kent; Anderson, Bruce

doi:10.1111/j.1745-6584.2011.00840.x

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…29,30 Moreover the system can be applied to meet the need of complex contaminant migration patterns. 31 Here, a simple inexpensive system for sample collection combined with TiO2/SiO2 phosphorimetric test kits was fabricated for the detection of H2O2 concentration at many levels in simulated water.…”

Section: Introductionmentioning

confidence: 99%

Synchronous Multi-sits Determination of H2O2 in Vertical Water Based on Phosphor TiO2/SiO2 Nanocomposite

et al. 2016

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A promising strategy for trace analysis of hydrogen peroxide (H2O2) in natural water was established based on solid substrate room temperature phosphorimetry. The use of TiO2/SiO2 composite material as a phosphor for H2O2 detection was investigated. TiO2/SiO2 nanoparticle material was manufactured into a test kit for synchronous multilevel sampling test in the water sample reservoir. The proposed TiO2/SiO2 test kit displayed a wide linear response to H2O2 concentrations ranging from 1.0 × 10 -6 to 1.0 × 10 -1 M with a detection limit of 4.6 × 10 -7 M. When the concentration of other species was 100 times of 1.0 × 10 -4 M H2O2, the proposed test kit exhibited good selectivity toward the coexistence of 20 foreign ions. Satisfactory agreement between the proposed kit and spectrophotometric method was obtained, which demonstrated the possibility of its further development into a promising commercial phosphorescence sensor.

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Section: Introductionmentioning

confidence: 99%

Synchronous Multi-sits Determination of H2O2 in Vertical Water Based on Phosphor TiO2/SiO2 Nanocomposite

et al. 2016

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Influence of vertical flows in wells on groundwater sampling

McMillan¹,

Rivett²,

Tellam³

et al. 2014

Journal of Contaminant Hydrology

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Pumped groundwater sampling evaluations often assume that horizontal head gradients predominate and the sample comprises an average of water quality variation over the well screen interval weighted towards contributing zones of higher hydraulic conductivity (a permeability-weighted sample). However, the pumping rate used during sampling may not always be sufficient to overcome vertical flows in wells driven by ambient vertical head gradients. Such flows are reported in wells with screens between 3 and 10m in length where lower pumping rates are more likely to be used during sampling. Here, numerical flow and particle transport modeling is used to provide insight into the origin of samples under ambient vertical head gradients and under a range of pumping rates. When vertical gradients are present, sample provenance is sensitive to pump intake position, pumping rate and pumping duration. The sample may not be drawn from the whole screen interval even with extended pumping times. Sample bias is present even when the ambient vertical flow in the wellbore is less than the pumping rate. Knowledge of the maximum ambient vertical flow in the well does, however, allow estimation of the pumping rate that will yield a permeability-weighted sample. This rate may be much greater than that recommended for low-flow sampling. In practice at monitored sites, the sampling bias introduced by ambient vertical flows in wells may often be unrecognized or underestimated when drawing conclusions from sampling results. It follows that care should be taken in the interpretation of sampling data if supporting flow investigations have not been undertaken.

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Influence of Piezometer Construction on Groundwater Sampling in Fractured Rock

Cited by 2 publications

References 18 publications

Synchronous Multi-sits Determination of H2O2 in Vertical Water Based on Phosphor TiO2/SiO2 Nanocomposite

Synchronous Multi-sits Determination of H2O2 in Vertical Water Based on Phosphor TiO2/SiO2 Nanocomposite

Influence of vertical flows in wells on groundwater sampling

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