HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via ISI Web of Science (1) Citing Articles via Google Scholar Google Scholar Articles by Devall, M. S. Articles by Flowers, G. Search for Related Content PubMed PubMed Citation Articles by Devall, M. S. Articles by Flowers, G. Agricola Articles by Devall, M. S. Articles by Flowers, G. Related Collections Toxic Trace Metals Heavy Metals Plant and Environment Interactions Soil Pollution

Lead Transport into Bayou Trepagnier Wetlands in Louisiana, USA

^a USDA Forest Service, Center for Bottomland Hardwoods Research, P.O. Box 227, Stoneville, MS 38776
^b Cell and Molecular Biology Department, Tulane University, New Orleans, LA 70118
^c Department of Geology, Tulane University, New Orleans, LA 70118
^d E. Ellgaard (deceased), Cell and Molecular Biology Department, Tulane University, New Orleans, LA 70118

View larger version (33K): [in a new window]   Fig. 1. Map of Bayou Trepagnier near New Orleans, LA, showing the spoil banks and the Norco Manufacturing Complex. Bayou Trepagnier merges with Bayou LaBranche a short distance from the lake.

View larger version (8K): [in a new window]   Fig. 2. Lead (1687-1995) in the tree rings of a 300+ yr-old baldcypress tree growing along Bayou Trepagnier, downstream from the pollution point. The sharp increase of Pb beginning around 1920 correlates with the establishment of a petroleum plant, its subsequent expansion, and several dredging episodes. The detection limit is 1 mg/kg.

View larger version (13K): [in a new window]   Fig. 3. Levels of Pb in the top 10 cm of soil along Transect 1, eastward from Engineer's Canal (0 m), which is west of Bayou Trepagnier. Transect 1 begins at the base of the spoil bank along Bayou Trepagnier. Soil organic material was scraped from 21 randomly located sites along a line beginning west of Transect 1, starting at Engineers Canal west of Bayou Trepagnier and extending east into the swamp, and a 0.5-L sample of soil was collected at each site and analyzed. The detection limit is 1 mg/kg.

View larger version (11K): [in a new window]   Fig. 4. Lead in tree rings of 16 cores from baldcypress trees, 1893-1997, along Transect 1 running perpendicular to Bayou Trepagnier into the adjacent baldcypress-tupelo community; distance from the edge of the spoil bank on the east side of the bayou indicated by numerals under bars. Error bars indicate standard error. The level of Pb in trees along Stinking Bayou, the reference area, was significantly different from the levels in trees along the two transects (see Table 2). The detection limit is 1 mg/kg.

View larger version (9K): [in a new window]   Fig. 5. Lead in tree rings of 12 cores from baldcypress trees, 1893-1997, along Transect 2 running perpendicular to Bayou Trepagnier into the adjacent baldcypress-tupelo community; distance from the spoil bank on the east side of the bayou indicated by numerals under bars. Error bars indicate standard error. The level of Pb in trees along Stinking Bayou, the reference area, was significantly different from the levels in trees along the two transects (see Table 2). The detection limit is 1 mg/kg.

View larger version (17K): [in a new window]   Fig. 6. Profile of Pb in tree rings of baldcypress along Transects 1 and 2 running perpendicular to Bayou Trepagnier into the adjacent cypress-tupelo community, and Stinking Bayou, a bayou that empties into Lake Pontchartrain 35 km north of Bayou Trepagnier. Error bars indicate standard error. The level of Pb in trees along Stinking Bayou, the reference area, was significantly different from the levels in trees along the two transects (see Table 2). The detection limit is 1 mg/kg.