Effect of ionic strength on adsorption of As(III) and As(V) on variable charge soils

Xu, Ren-kou; Wang, Yong; Tiwari, Diwakar; Wang, Houyan

doi:10.1016/s1001-0742(08)62363-3

Cited by 63 publications

(40 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The short-term mechanism for As release due to salinity from the salt marsh sediments could be electrostatic competition with anions in the salt water (Chapman & Wang, 2001). These include bicarbonate and carbonate (Appelo et al, 2002;Ardau et al, 2013;Kim et al, 2000), sulfate (Borda & Sparks, 2007), sulfide (Kocar et al, 2010), nitrate (Xu et al, 2009), and phosphate or molybdate (Barrow, 1974;Manning & Goldberg, 1996;Melamed et al, 1995;Roy et al, 1986;Smith et al, 2002;Woolson et al, 1973). As the salinity increases, both cations and anions are introduced, increasing ionic strength of the solution.…”

Section: Mechanisms Of Arsenic Release During Extreme Eventsmentioning

confidence: 99%

Effects of Extreme Events on Arsenic Cycling in Salt Marshes

2018

View full text Add to dashboard Cite

Extreme events such as storm surges, intense precipitation, and supermoons cause anomalous and large fluctuations in water level in tidal salt marshes, which impacts the sediment biogeochemistry that dictates arsenic (As) cycling. In addition to changes in water level, which impacts soil redox potential, these extreme events may also change salinity due to freshwater inputs from precipitation or saltwater inputs due to surge. It is currently unknown how As mobility in tidal salt marshes will be impacted by extreme events, as fluctuations in salinity and redox potential may act synergistically to mobilize As. To investigate impacts of extreme events on As cycling in tidal salt marshes, we conducted a combined laboratory and field investigation. We monitored pore water and soil samples before, during, and after two extreme events: a supermoon lunar eclipse followed by a storm surge and precipitation induced by Hurricane Joaquin in fall 2015 at the St. Jones Reserve in Dover, Delaware, a representative tidal salt marsh in the Mid‐Atlantic United States. We also conducted soil incubations of marsh sediments in batch and in flow‐through experiments in which redox potential and/or salinity were manipulated. Field investigations showed that pore water As was inversely proportional to redox potential. During the extreme events, a distinct pulse of As was observed in the pore water with maximum salinity. Combined field and laboratory investigations revealed that this As pulse is likely due to rapid changes in salinity. These results have implications for As mobility in the face of extreme weather variability.

show abstract

Section: Mechanisms Of Arsenic Release During Extreme Eventsmentioning

confidence: 99%

Effects of Extreme Events on Arsenic Cycling in Salt Marshes

2018

View full text Add to dashboard Cite

show abstract

“…The transport of As(V) and Se(VI) may be affected also by sorption onto iron oxyhydroxides in soil, which varied with solution ionic strength (Peak and Sparks, 2002;Xu et al, 2009;Vithanage et al, 2013). As indicated by area integration of the BTCs, the sorption of As(V) on BY soil was comparatively less in Day 14 solution while the sorption of Se(VI) increased with increasing ionic strength.…”

Section: Sorption/desorption Of As(v) and Se(vi) In Produced Watermentioning

confidence: 99%

“…For soils displaying variable charge, the capacity of anion sorption at different ionic strengths would approach the same value at the pH of the point of zero salt effect (PZSE). At a pH below the PZSE the soil exhibited a positively charged plane of adsorption for the anions, in which an increasing ionic strength would accumulate more counter-ions (Barrow and Ellis, 1986;Bolan et al, 1986;Xu et al, 2009).…”

Section: Sorption/desorption Of As(v) and Se(vi) In Produced Watermentioning

confidence: 99%

Insights into the subsurface transport of As(V) and Se(VI) in produced water from hydraulic fracturing using soil samples from Qingshankou Formation, Songliao Basin, China

Chen

Sun

Tsang

et al. 2017

Environmental Pollution

View full text Add to dashboard Cite

19Produced water is a type of wastewater generated from hydraulic fracturing, which may pose a 20 risk to the environment and humans due to its high ionic strength and the presence of elevated 21 concentrations of metals/metalloids that exceed maximum contamination levels. The The influence of produced water on the hydrogeological conditions (i.e., change between 30 equilibrium and non-equilibrium transport) was evidenced by the change of tracer breakthrough 31 curves before and after the leaching of produced water. This possibly resulted from the sorption 32 of polyacrylamide (PAM (-CH 2 CHCONH 2 -) n ) onto soil surfaces, through its use as a friction 33 reducer in fracturing solutions. The sorption was found to be reversible in this study. Minimal 34 amounts of sorbed As(V) were desorbed whereas the majority of sorbed Se(VI) was readily 35 leached out, to an extent which varied with the composition of the produced water. These results 36showed that the mobilization of As(V) and Se(VI) in soil largely depended on the solution pH 37 and ionic strength. Understanding the differences in metal/metalloid transport in produced water 38 is important for proper risk management.

show abstract

“…Xu et al [27] reported that increasing the ionic strength increased the adsorption of As(V) on two types of soil. Although alkalinity favors HFO formation after addition of ferric chloride [13], it inhibits sorption onto goethite [28][29][30] or HFO [20,31,32].…”

Section: Constituentmentioning

confidence: 99%