Isolation of hydrophilic organic acids from water using nonionic macroporous resins

Aiken, George R.; McKnight, Diane M.; Thorn, Kevin A.; Thurman, E. Michael

doi:10.1016/0146-6380(92)90119-i

Cited by 593 publications

(416 citation statements)

References 10 publications

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“…(Aiken et al, 1992). DOC and C fractions were determined at the USGS laboratory in Boulder, CO. Additional aliquots were collected for total suspended solids (TSS) and particulate organic carbon (POC) analysis and filtered with separate glass fiber filters for gravimetric determination at the Chesapeake Biological Laboratory in Solomons, MD.…”

Section: Methodsmentioning

confidence: 99%

Comparison of total mercury and methylmercury cycling at five sites using the small watershed approach

Shanley

Mast

Campbell

et al. 2008

Environmental Pollution

101

108

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Martin M., "Comparison of total mercury and methylmercury cycling at five sites using the small watershed approach" (2008 High-flow sampling reveals strong contrasts in total mercury and methylmercury cycling in five diverse USA watersheds. AbstractThe small watershed approach is well-suited but underutilized in mercury research. We applied the small watershed approach to investigate total mercury (THg) and methylmercury (MeHg) dynamics in streamwater at the five diverse forested headwater catchments of the US Geological Survey Water, Energy, and Biogeochemical Budgets (WEBB) program. At all sites, baseflow THg was generally less than 1 ng L À1 and MeHg was less than 0.2 ng L À1. THg and MeHg concentrations increased with streamflow, so export was primarily episodic. At three sites, THg and MeHg concentration and export were dominated by the particulate fraction in association with POC at high flows, with maximum THg (MeHg) concentrations of 94 (2.56) ng L À1 at Sleepers River, Vermont; 112 (0.75) ng L À1 at Rio Icacos, Puerto Rico; and 55 (0.80) ng L À1at Panola Mt., Georgia. Filtered (<0.7 mm) THg increased more modestly with flow in association with the hydrophobic acid fraction (HPOA) of DOC, with maximum filtered THg concentrations near 5 ng L À1 at both Sleepers and Icacos. At Andrews Creek, Colorado, THg export was also episodic but was dominated by filtered THg, as POC concentrations were low. MeHg typically tracked THg so that each site had a fairly constant MeHg/THg ratio, which ranged from near zero at Andrews to 15% at the low-relief, groundwater-dominated Allequash Creek, Wisconsin. Allequash was the only site with filtered MeHg consistently above detection, and the filtered fraction dominated both THg and MeHg. Relative to inputs in wet deposition, watershed retention of THg (minus any subsequent volatilization) was 96.6% at Allequash, 60% at Sleepers, and 83% at Andrews. Icacos had a net export of THg, possibly due to historic gold mining or frequent disturbance from landslides. Quantification and interpretation of Hg dynamics was facilitated by the small watershed approach with emphasis on event sampling.

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Section: Methodsmentioning

confidence: 99%

Comparison of total mercury and methylmercury cycling at five sites using the small watershed approach

Shanley

Mast

Campbell

et al. 2008

Environmental Pollution

101

108

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“…Lake geochemistry. All SPE-DOM samples were collected, filtered and processed on DAX-8 resin according to Aiken et al 21 with some modifications (see Table 1 for elution solvents). All bulk DOC samples that accompanied SPE-DOM extraction were filtered through combusted 47 mm glass fibre filters (G/FF; Whatman) and collected in combusted glass 40 ml vials (Table 1).…”

Section: Methodsmentioning

confidence: 99%

Refractory dissolved organic nitrogen accumulation in high-elevation lakes

et al. 2015

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The role of dissolved organic matter (DOM) as either a sink for inorganic nutrients or an additional nutrient source is an often-neglected component of nutrient budgets in aquatic environments. Here, we examined the role of DOM in reactive nitrogen (N) storage in Sierra Nevada (California, USA) lakes where atmospheric deposition of N has shifted the lakes toward seasonal phosphorus (P)-limitation. Nuclear magnetic resonance (NMR) spectroscopy and isotope analyses performed on DOM isolated from Lake Tahoe reveal the accumulation of refractory proteinaceous material with a 100-200-year residence time. In contrast, smaller lakes in the same watershed contain DOM with typical terrestrial characteristics, indicating that proteins in Lake Tahoe are autochthonously produced. These data support the role of DOM as a possible sink for reactive N in these lake ecosystems and identify a potential role for DOM in affecting the inorganic nutrient stoichiometry of these environments.

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“…Dissolved organic carbon was analyzed on an OI Analytical Model 700 TOC analyzer (Aiken et al 1992). UV 254 measurements (absorbance at k = 254 nm) were made with a Hewlett-Packard Photodiode Array Spectrophotometer (model 8453) using a 10 mm quartz cell.…”

Section: Laboratory Analysesmentioning

confidence: 99%

Specific ultra-violet absorbance as an indicator of mercury sources in an Adirondack River basin

et al. 2012

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Isolation of hydrophilic organic acids from water using nonionic macroporous resins

Cited by 593 publications

References 10 publications

Comparison of total mercury and methylmercury cycling at five sites using the small watershed approach

Comparison of total mercury and methylmercury cycling at five sites using the small watershed approach

Refractory dissolved organic nitrogen accumulation in high-elevation lakes

Specific ultra-violet absorbance as an indicator of mercury sources in an Adirondack River basin

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