Chlorine-36

Phillips, Fred M.

doi:10.1007/978-1-4615-4557-6_10

Cited by 55 publications

(65 citation statements)

References 129 publications

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“…These differences in isotopic composition may find important applications in resolving questions of ClO4 -source apportionment for affected water supplies, such as those in the Study Area. Cl/Cl values ranging from ~10 × 10 -15 near coasts to as high as ~ 1700 × 10 -15 in the central Rocky Mountains (Bentley et al, 1986;Phillips, 2000;Davis et al, 2003). (Sturchio et al, 2009).…”

Section: O Valuesmentioning

confidence: 99%

“…The presence of bomb-generated 36 Cl from nuclear tests in the mid 1950's (Phillips, 2000;Davis et al, 2003) could not be ruled out for samples from southwestern U.S. groundwater having detectable tritium, and apparently it is present in indigenous ClO4 -in the upper Great Lakes, which still contain much of the water that was present in the 1950s and 1960s (Poghosyan et al, 2014). However,…”

Section: Abundance Of 36 CL In Synthetic and Natural Perchloratementioning

confidence: 99%

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Evaluation of Perchlorate Sources in the Rialto-Colton and Chino California Subbasins using Chlorine and Oxygen Isotope Ratio Analysis

Hatzinger¹,

Boehlke²,

Izbicki³

et al. 2015

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T he public reporting burden for this collection of information is estimated to a ven:~~ge 1 hour per response. including t he time for reviewing instruction-;. search ing exist ing dat a sources. gathering and maintaining t he data needed. end completing and review ing th e collection of information_ Send comments reg arding t his burden estimate or any othe . Perchlorate in groundwater can be from synthetic or natmal sources. the latter of which include both historical application of impotted nitrate fertilizers fi·om the Atacama Desert of Chile and atmospheric perchlorate. The objective of this study was to evaluate the use of isotopic data to distinguish somces of perchlorate in groundwater in a specific region of the Rialto-Colton and Chino. CA groundwater subbasins. Perchlorate extrac ted from wells in tlus region was analyzed for chlorine and oxygen stable isotope ratios and radioactive chlorine-36 isotopic abundance. along w ith other geochenucal. isotopic. and hydrogeologic data. The stable isotope and chlOI~ne-36 data provided relatively unambiguous discrinunation of synthetic and Atacama perchlorate sources in most wells having relatively high concentt·ations. providing regional perspective on anthl'Opogenic perchlorate contamination in the Rialto-Colton and Cluno subbasins. Where indigenous natmal perchlorate was indicated as a substantial component. total perchlorate concentt·ations were low and concentrations of anthropogenic components were near backgrotmd levels.

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Section: O Valuesmentioning

confidence: 99%

Section: Abundance Of 36 CL In Synthetic and Natural Perchloratementioning

confidence: 99%

Evaluation of Perchlorate Sources in the Rialto-Colton and Chino California Subbasins using Chlorine and Oxygen Isotope Ratio Analysis

Hatzinger¹,

Boehlke²,

Izbicki³

et al. 2015

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“…Additionally, the interpretation of 36 Cl can be affected by the input function, as 36 Cl values from rainfall vary temporally. This means that the input function for rainfall from any time in the past may be different from current conditions (Phillips, 2000). However, in regions with low and fairly consistent Cl concentrations (such as in our study area), 36 Cl values can provide solid indications of old groundwater residence times (Mahara et al, 2007).…”

Section: Introductionmentioning

confidence: 84%

“…The apparent degree of 36 Cl decay observed in the alluvial groundwater samples is too large to be explained simply by radioactive decay as indicated by the measurable 14 C content in the same samples (Phillips, 2000). This means that the time needed for the 36 Cl to decay as much as observed would be well outside the range of 14 C dating (> 30 ka) and therefore all groundwater samples would be expected to have a 14 C content of 0 pmc, which is not observed.…”

Section: Extent Of Interaction Between the Gab And The Lnamentioning

confidence: 91%

A multi-tracer approach to constraining artesian groundwater discharge into an alluvial aquifer

Iverach

Cendón

Meredith

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. Understanding pathways of recharge to alluvial aquifers is important for maintaining sustainable access to groundwater resources. Water balance modelling is often used to proportion recharge components and guide sustainable groundwater allocations. However, it is not common practice to use hydrochemical evidence to inform and constrain these models. Here we compare geochemical versus water balance model estimates of artesian discharge into an alluvial aquifer, and demonstrate why multi-tracer geochemical analyses should be used as a critical component of water budget assessments. We selected a site in Australia where the Great Artesian Basin (GAB), the largest artesian basin in the world, discharges into the Lower Namoi Alluvium (LNA), an extensively modelled aquifer, to convey the utility of our approach. Water stable isotopes (δ 18 O and δ 2 H) and the concentrations of Na + and HCO − 3 suggest a continuum of mixing in the alluvial aquifer between the GAB (artesian component) and surface recharge, whilst isotopic tracers ( 3 H, 14 C, and 36 Cl) indicate that the alluvial groundwater is a mixture of groundwaters with residence times of < 70 years and groundwater that is potentially hundreds of thousands of years old, which is consistent with that of the GAB. In addition, Cl − concentrations provide a means to calculate a percentage estimate of the artesian contribution to the alluvial groundwater. In some locations, an artesian contribution of up to 70 % is evident from the geochemical analyses, a finding that contrasts with previous regional-scale water balance modelling estimates that attributed 22 % of all inflow for the corresponding zone within the LNA to GAB discharge. Our results show that hydrochemical investigations need to be undertaken as part of developing the conceptual framework of a catchment water balance model, as they can improve our understanding of recharge pathways and better constrain artesian discharge to an alluvial aquifer.

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“…Chloride concentrations and the available 36 Cl/Cl ratios for groundwater within the Yucca Flat are presented in Cl (from uranium-thorium series decay) at depth over long periods of time (Bentley et al, 1986;Phillips, 2000).…”

Section: Chlorine-36mentioning

confidence: 99%

Geochemical and Isotopic Evaluation of Groundwater Movement in Corrective Action Unit 97: Yucca Flat/Climax Mine, Nevada Test Site, Nevada, Rev. No.: 0

Farnham¹

2006

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Chlorine-36

Cited by 55 publications

References 129 publications

Evaluation of Perchlorate Sources in the Rialto-Colton and Chino California Subbasins using Chlorine and Oxygen Isotope Ratio Analysis

Evaluation of Perchlorate Sources in the Rialto-Colton and Chino California Subbasins using Chlorine and Oxygen Isotope Ratio Analysis

A multi-tracer approach to constraining artesian groundwater discharge into an alluvial aquifer

Geochemical and Isotopic Evaluation of Groundwater Movement in Corrective Action Unit 97: Yucca Flat/Climax Mine, Nevada Test Site, Nevada, Rev. No.: 0

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