δD and δ18O evidence for inputs to groundwater at a wetland coastal boundary in the southern Great Lakes region of Canada

Carbon-isotope ratios and carbon, nitrogen and sulfur abundances in flora and soil organic matter from a temperate-zone bog and marsh.

“…Sand ridges enclosing the marsh formed ~4000 years B.P from remnants of the Pelee-Lorain moraine during a progressive rise of lake levels in the western and central basins of Lake Erie (Coakley, 1976;Coakley et al, 1998). Marsh waters are considered to be isolated from those of Lake Erie, except during major storm events (Bayly and O'Neill, 1971;Huddart et al, 1999). The present marsh covers an area of ~1,050 hectares or ~70% of the park area.…”

Analytical procedures for determining Pb and Sr isotopic compositions in water samples by ID-TIMS

“…5 Sr and Pb isotopes can be used as environmental indicators of water contamination and for possible identification of its source, [6][7][8][9] as they provide different isotopic signatures. The use of isotopic techniques has been applied to identify recharge sources and routes in groundwater studies for the last decade, 3 but the majority of these deal with strontium, oxygen and hydrogen isotopes, [10][11][12][13][14][15][16][17][18][19][20][21] whereas Pb is not often examined. [22][23][24][25][26] Stable isotopes (O and H) are considered as water isotopes, tracing the source and pathway of water molecules, while radiogenic isotopes (Sr and Pb) are solute isotopes, and trace the source and pathway of dissolved ions in the hydrologic cycle.…”

Using stable isotopes of water to infer wetland hydrological dynamics

“…Variations in stable isotope composition can clarify patterns of groundwater recharge and flow and have been used to estimate groundwater residence time within valley-bottom organic deposits in an upland catchment (Soulsby et al, 2000). Stable isotopes have been used successfully to discriminate sources of groundwater recharge in a coastal wetland (Huddart et al, 1999) and to determine wetland water sources for use in mixing models (Hunt et al, 1996;1997). These studies demonstrate that where discrete water inflows can be characterised by distinct isotopic signatures, stable isotopes may indicate the provenance and residence time of wetland waters.…”