A model of the exchange of inorganic chemicals between water and sediments

Diamond, Miriam L.; Mackay, Donald; Cornett, R. J.; Chant, L.A.

doi:10.1021/es00075a016

Cited by 44 publications

(39 citation statements)

References 17 publications

(52 reference statements)

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“…This variability may reflect variable recovery and/or exchange of "TcOj during the radiochemical separation of "Tc from other nuclides. The rate of transfer of "Tc from water to the sediments was less than that of 22 Na and all other radionuclides added [15]. This is consistent with the anionic behaviour of Tc0 4 in oxic surface water [9].…”

Section: Tc Dynamicssupporting

confidence: 79%

“…"Tc activity fluctuated much more than those of other nuclides (see other data in Figure 1 and also in Diamond et al [15]). This variability may reflect variable recovery and/or exchange of "TcOj during the radiochemical separation of "Tc from other nuclides.…”

Section: Tc Dynamicsmentioning

confidence: 63%

“…These rates are slightly lower than the loss rates of all the other radiotracers added (3 to 12% d" 1 )[15], except 22 Na (loss rate 1-1.8% d -1 )[13] and "Tc. The rates of radioiodine transport are very similar to those measured in two other whole-lake experiments.…”

mentioning

confidence: 67%

See 2 more Smart Citations

The Transfer of Iodine and Technetium from Surface Waters to Sediments

et al. 1992

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We have measured the partitioning and the rates of transfer of 131 I, 125 I and "Tc from the soluble phase to the particulate fraction and to the surficial organic-rich sediments in a small Shield lake. Transfer rates were very low for both elements. The iodine data could only be fitted to a compartment model if we assumed that iodine was associated with a very large molecule. In order to test the potential for iodine speciation to control the rate of I adsorption, the rate of association of I with humic and fulvic acids in natural waters has been investigated in the laboratory by ultrafiltration. After one day essentially all the radioiodine introduced was found in the > 500 MW fraction, with ~ 60% in the > 10000 MW fraction. This measurement is consistent with the in situ behaviour previously observed, and supports the hypothesis that iodine reaction with organics is a controlling process in natural waters.

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Section: Tc Dynamicssupporting

confidence: 79%

Section: Tc Dynamicsmentioning

confidence: 63%

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The Transfer of Iodine and Technetium from Surface Waters to Sediments

et al. 1992

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“…Santschi et al, 1986 ;Cornett & Ophel, 1986 ;Cornett & Chant, 1988) . Once deposited in the surficial sediments, the contaminant may be recycled back into the water by particle resuspension or desorption and diffusion, or buried deeper in the sediment column by subsequent sediment inputs (Thomann & Di Toro, 1983 ;Diamond et al, 1990). The relative importance of these internal fluxes, external loading and hydrologic flushing determine the fate of the contaminant in the system, and the rate that a contaminated system will recover .…”

Section: Introductionmentioning

confidence: 99%

Arsenic transport between water and sediments

Cornett¹,

Chant²,

Risto³

1992

Hydrobiologia

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Arsenic discharged into the Moira River has accumulated in the sediments of Moira Lake during the past century . The chronology of arsenic concentrations in the sediments, established using Pb-210 dating, has a subsurface concentration maximum (> 1000 tg g -') that reflects higher inputs to the lake 15 to 45 years ago . The distribution coefficient (K d ) of arsenic in the surficial sediments was low (4000-6000 L kg -') and decreased below the sediment water interface . Higher concentrations of exchangeable As also were extracted deeper in the sediments . As a result, arsenic is mobile in the sediment column and the flux of arsenic via diffusion and particle resuspension from the sediments into the water is greater than current external loading from the Moira River . Less than 20%s of the external input of arsenic is buried in the lake sediments . Using these flux measurements and a one dimensional model of arsenic transport in the sediment column, we constructed the history of arsenic exchange between water and sediments throughout the past century . The simulations predict that arsenic input into the water from the sediments has been > 20% of external loading for the past 25 years and will continue to be important in the future as diffusion and resuspension regenerate arsenic from the mixed layer of the sediments into the overlying water. 533

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“…For this, the new equilibrium criterion of aquivalence Q (mol/m^) has been developed and applied to modify the QWASI model (Mackay & Diamond 1989;Diamond et al 1990). As described by Diamond et al (1990), the linear relation between fugacity / or Q and concentration (C) is described as…”

Section: Development Of Idma Modelmentioning

confidence: 99%

Chloride ion transport and fate in oilfield wastewater reuse by interval dynamic multimedia aquivalence model

Yan

Zhang

Wang

et al. 2013

Water Science and Technology

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A surface flow constructed wetland was built up to dispose of oilfield wastewater with a high level of inorganic salt ions. Chlorine ion (Cl(-)) was selected as an indicator of soil secondary salinization, and an interval dynamic multimedia aquivalence (IDMA) model was developed to investigate the dynamic multimedia environmental (air, water, soil, flora, and groundwater) effects of Cl(-) in the wastewater irrigation process between 2002 and 2020. The modeled Cl(-) concentrations were in good agreement with the measured ones, as indicated by the interval average logarithmic residual errors (IALREs) being generally lower than 0.5 logarithmic units. The model results showed that the temporal trends of Cl(-) concentrations in the multimedia environments represented a relatively steady state. More than 97.00% of the mass exchange was finished between soil and groundwater compartments, and Cl(-) finally outputted the environmental system by the pathways of advection outflows in the water (71.03%) and groundwater (24.02%). Soil (59.17%) was the dominant sink of Cl(-). It was revealed that the high level of Cl(-) in oilfield wastewater was well treated by the constructed wetland, and there was not a significant environmental effect of soil secondary salinization in the oilfield wastewater reused for the constructed wetland irrigation.

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A model of the exchange of inorganic chemicals between water and sediments

Cited by 44 publications

References 17 publications

The Transfer of Iodine and Technetium from Surface Waters to Sediments

The Transfer of Iodine and Technetium from Surface Waters to Sediments

Arsenic transport between water and sediments

Chloride ion transport and fate in oilfield wastewater reuse by interval dynamic multimedia aquivalence model

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