NDLI: Lead biogeochemistry in the littoral zones of south-central Ontario lakes, Canada, after the elimination of gasoline lead additives

Content Provider	Springer Nature Link
Author	Outridge, P. M.
Copyright Year	2000
Abstract	Stable Pb isotope ratios were used to trace thesources and pathways of Pb between the atmosphere,surficial sediment fractions, the white water-lilyNymphaea odorata, and waters collected at 26littoral sites in 23 Ontario lakes in summer 1993,three years after alkyl Pb additives were finallyeliminated from Canadian gasoline. Based onsimilarities of isotopic composition, the exchange ofPb between lakewater and sediment 'carbonate', andsubsequently between 'carbonate', 'oxide' and othersediment fractions, was the most likely water-sedimentpathway of Pb movement. pH controlled Pb fractionationwithin surficial sediments, with the 'organic' poolcomprising 80–97% of total Pb in most acidic lakesand 15–60% in alkaline lakes. About 28% of the Pb inN. odorata shoots was accumulated directly fromwater, whereas there was no evidence of root uptake ofPb from sediments. The Pb in plant tissues wasisotopically homogeneous and dissimilar to thevariable composition exhibited in ambient waters andsediments. Plant Pb isotopes strongly resembled thehistorical Canadian atmospheric (alkyl Pb) signature.A possible explanation is that, like essential tracemetals, historically-accumulated Pb was highlyconserved during the annual growth cycle of thislong-lived, clonal macrophyte, being storedover-winter in underground rhizomes and recycled intospring growth. Given the low rate of 'new' Pb uptake,historical alkyl Pb may continue to dominate planttissues for some time, even though it was notdetectable in littoral waters and sediments.
Starting Page	179
Ending Page	201
Page Count	23
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	118
Issue Number	1-2
e-ISSN	15732932
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2000-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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