Contrasting dissolved organic matter quality in groundwater in Holocene and Pleistocene aquifers and implications for influencing arsenic mobility

Kulkarni, Harshad Vijay; Mladenov, Natalie; Johannesson, Karen H.; Datta, Saugata

doi:10.1016/j.apgeochem.2016.06.002

Cited by 102 publications

(46 citation statements)

References 80 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to the study presented here, the EEM‐PARAFAC approach has also been used to track the presence of water of a terrestrial origin in aquifers underlying the Florida Bay (Chen et al, ), landfill leachate in groundwater (He et al, ), and contamination in wells (Stedmon et al, ). The use of EEM‐PARAFAC to resolve groundwater with different age distributions in colocated aquifers is unusual but not unprecedented (e.g., Kulkarni et al, ). Groundwater with a large amino acid‐like fDOM signal but low humic content (i.e., like Old Groundwater) has been interpreted to indicate filtering of humics by the aquifer material, combined with in situ production of DOM (Birdwell & Engel, ; Simon et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…In addition to the study presented here, the EEM-PARAFAC approach has also been used to track the presence of water of a terrestrial origin in aquifers underlying the Florida Bay (Chen et al, 2010), landfill leachate in groundwater (He et al, 2015), and contamination in wells (Stedmon et al, 2011). The use of EEM-PARAFAC to resolve groundwater with different age distributions in colocated aquifers is unusual but not unprecedented (e.g., Kulkarni et al, 2017).…”

Section: Fluorescent Fingerprinting To Understand Groundwater Flow Pamentioning

confidence: 99%

See 1 more Smart Citation

Groundwater Is Key to Salmonid Persistence and Recruitment in Intermittent Mediterranean‐Climate Streams

Larsen

Woelfle‐Erskine

2018

Water Resources Research

View full text Add to dashboard Cite

Juvenile coho salmon thrive in intermittent streams of the Pacific Northwest yet are in danger of increased mortality from drought and rising temperatures. With warmer temperatures and more frequent climate extremes projected, the need to understand how intermittent stream hydrology and biogeochemistry impact juvenile salmonid habitat and behavior is imperative. Previous investigations indicated that dissolved oxygen limits the persistence of coho salmon in intermittent streams, leading to the hypothesis that groundwater inflow would ultimately control patterns of salmon recruitment and persistence. Here we tested that hypothesis in paired tributaries of Salmon Creek, Sonoma County, CA during California's extreme drought of 2011–2017. We used the fluorescent fingerprint of dissolved organic carbon, together with a parallel factor analysis, to estimate groundwater influence in individual stream pools, corroborating those estimates with stable isotope and radon analyses. Repeat snorkel surveys provided fish counts in those pools at the beginning and end of the period of surface‐water disconnection. Results suggested that coho salmon fry preferentially selected pools with a groundwater inflow signal and persisted in pools maintaining that signal through the dry season. This groundwater inflow signal was distinct from hyporheic influence, which exhibited little correlation with fish distribution. Groundwater within pools was young, and spot measurements suggested that it was relatively oxygenated. Proportional groundwater contributions to pools increased as drought deepened. Results suggest that maintaining relatively high groundwater levels in coastal aquifers may be imperative to the persistence of vulnerable salmonid populations in a changing climate.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Fluorescent Fingerprinting To Understand Groundwater Flow Pamentioning

confidence: 99%

Groundwater Is Key to Salmonid Persistence and Recruitment in Intermittent Mediterranean‐Climate Streams

Larsen

Woelfle‐Erskine

2018

Water Resources Research

View full text Add to dashboard Cite

show abstract

“…Within the basin, reduction will be driven by more than one source of organic matter (OM hereinafter), the relative importance of which will differ from place to place. Potential sources are Soils and, where present, floodplain silts and clays that form local‐to‐regional upper aquitards over channel sands, as appears to happen elsewhere (Kulkarni, Mladenov, Johannesson, & Datta, ; Mailloux et al, ). Such deposits are thin and uncommon in the (mostly) unconfined aquifers of the upper Indus River plain in Punjab (Greenman et al, ) but are more likely to be present in the lower Indus River plain in Sindh owing to gentler slopes and the more meandering nature of the river in the south compared with the north. Surface point sources, such as rubbish dumps, for example, in markets (Naseem, ). The Leaking urban sewers and far field of pit latrines (McArthur et al, ). Canal water.…”

Section: Discussion Of Arsenicmentioning

confidence: 99%

“…Potential sources are 1. Soils and, where present, floodplain silts and clays that form localto-regional upper aquitards over channel sands, as appears to happen elsewhere (Kulkarni, Mladenov, Johannesson, & Datta, 2017;Mailloux et al, 2014). Such deposits are thin and uncommon in the (mostly) unconfined aquifers of the upper Indus River plain in Punjab (Greenman et al, 1967) but are more likely to be present in the lower Indus River plain in Sindh owing to gentler slopes and the more meandering nature of the river in the south compared with the north.…”

Section: Drivers Of Fe Reduction Tando Allahyarmentioning

confidence: 99%

Arsenic and other water‐quality issues affecting groundwater, Indus alluvial plain, Pakistan

Naseem

McArthur

2018

Hydrological Processes

View full text Add to dashboard Cite

Groundwater beneath the alluvial plain of the Indus River, Pakistan, is reported to be widely polluted by arsenic (As) and to adversely affect human health. In 79 groundwaters reported here from the lower Indus River plain in southern Sindh Province, concentrations of As exceeded the WHO guideline value for drinking water of 10 μg/L in 38%, with 22% exceeding 50 μg/L, Pakistan's guideline value. The As pollution is caused by microbially‐mediated reductive dissolution of sedimentary iron oxyhydroxides in anoxic groundwaters; oxic groundwaters contain <10 μg/L of As. In the upper Indus River plain, in Punjab Province, localized As pollution of groundwater occurs by alkali desorption as a consequence of ion exchange in groundwater, possibly supplemented by the use for irrigation of groundwater that has suffered ion exchange in the aquifer and so has values >0 for residual sodium carbonate. In the field area in southern Sindh, concentrations of Mn in groundwater exceed 0.4 mg/L in 11% of groundwaters, with a maximum of 0.7 mg/L, as a result of reduction of sedimentary manganese oxides. Other trace elements pose little or no threat to human health. Salinities in groundwaters range from fresh to saline (electrical conductivity up to 6 mS/cm). High salinities result from local inputs of waste water from unsewered sanitation but mainly from evaporation/evapotranspiration of canal water and groundwater used for irrigation. The process does not concentrate As in the groundwater owing to sorption of As to soils. Ion exchange exerts a control on concentrations of Na, Ca, and B but not directly on As. High values of Cl/Br mass ratios (most ≫288, the marine value) reflect the pervasive influence on groundwater of sewage‐contaminated water from irrigation canals through seepage loss and deep percolation of irrigation water, with additional, well‐specific, contributions from unsewered sanitation.

show abstract

“…The quality of DOM and its potential roles in As mobilization have been investigated using a range of fluorescence and absorbance spectroscopic techniques in Bangladesh (Mladenov et al, 2010(Mladenov et al, , 2015. Further, a PARAFAC model developed using samples from the same sites as in this study (West Bengal, India) identified four unique components, namely terrestrial humic-like, humic-like impacted by agriculture, protein-like, and microbial humic-like (Kulkarni et al, 2016). The association of DOM with Mn mobilization from aquifer sediments has not been examined to date.…”

Section: Introductionmentioning

confidence: 99%

Biogeochemical Controls on the Release and Accumulation of Mn and As in Shallow Aquifers, West Bengal, India

Vega

Kulkarni

Mladenov

et al. 2017

Front. Environ. Sci.

Self Cite

View full text Add to dashboard Cite

HIGHLIGHTS • Manganese and arsenic concentrations are elevated in Murshidabad groundwater. • Manganese release appears to be independent of dissolved organic matter quality. • Mineral precipitation and dissolution reactions impact fate of manganese. • Arsenic concentrations are related to dissolved organic matter quantity and quality. The prevalence of manganese (Mn) in Southeast Asian drinking water has recently become a topic of discussion, particularly when concurrent with elevated arsenic (As). Although Mn groundwater geochemistry has been studied, the link between dissolved organic matter (DOM) quality and Mn release is less understood. This work evaluates characteristics of DOM, redox chemistry, and the distribution of Mn within Murshidabad, West Bengal, India. Shallow aquifer samples were analyzed for cations, anions, dissolved organic carbon, and DOM properties using 3-dimensional fluorescence excitation emission matrices followed by parallel factor modeling analyses. Two biogeochemical regimes are apparent, separated geographically by the river Bhagirathi. East of the river, where E h and nitrate (NO − 3) values are low, humic-like DOM coexists with high dissolved Mn, As, and Fe. West of the river, lower dissolved As and Fe concentrations are coupled with more protein-like DOM and higher NO − 3 and E h values. Dissolved Mn concentrations are elevated in both regions. Based on the distribution of available electron acceptors, it is hypothesized that groundwater east of the Bhagirathi, which is more reducing and enriched in dissolved Fe and Mn but depleted in NO − 3 , is chemically dominated by Mn(IV)/Fe(III) reduction processes. West of the river where NO − 3 is abundant yet dissolved Fe is absent, NO − 3 and Mn(IV) likely buffer redox conditions such that E h values are not sufficiently reducing to release Fe into the dissolved phase. The co-occurrence of humic-like Vega et al. Biogeochemical Controls of Mn and As in Shallow Aquifers DOM with dissolved As, Fe, and Mn in the more reducing aquifers may reflect complex formation between humic DOM and metals, as well as electron shuttling processes involving humic DOM, which may enhance metal(loid) release. Saturation indices of rhodochrosite (MnCO 3) suggest that precipitation is thermodynamically favorable in a greater proportion of the more reducing sites, however humic DOM-Mn complexes may be inhibiting MnCO 3 precipitation. Where dissolved arsenic concentrations are low, it is postulated that Mn(IV) reduction is oxidizing As(III) to As(V), increasing the potential for re-adsorption of As(V) onto relatively stable, un-reduced or newly precipitated Fe-oxides. Manganese release appears to be independent of DOM quality, as it persists in both humic and protein-like DOM environments.

show abstract

Contrasting dissolved organic matter quality in groundwater in Holocene and Pleistocene aquifers and implications for influencing arsenic mobility

Cited by 102 publications

References 80 publications

Groundwater Is Key to Salmonid Persistence and Recruitment in Intermittent Mediterranean‐Climate Streams

Groundwater Is Key to Salmonid Persistence and Recruitment in Intermittent Mediterranean‐Climate Streams

Arsenic and other water‐quality issues affecting groundwater, Indus alluvial plain, Pakistan

Biogeochemical Controls on the Release and Accumulation of Mn and As in Shallow Aquifers, West Bengal, India

Contact Info

Product

Resources

About