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Laboratory 14: CRSS/FANR 3060 Spring 2011. Urban soils often contaminated with metals (Pb) Refining,...
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Transcript of Laboratory 14: CRSS/FANR 3060 Spring 2011. Urban soils often contaminated with metals (Pb) Refining,...
![Page 1: Laboratory 14: CRSS/FANR 3060 Spring 2011. Urban soils often contaminated with metals (Pb) Refining, smelting (aerial deposition) Plumbing (Pb solder)](https://reader034.fdocuments.net/reader034/viewer/2022042718/56649e3f5503460f94b2ff0d/html5/thumbnails/1.jpg)
Lead (Pb) in Urban Soils
Laboratory 14: CRSS/FANR 3060Spring 2011
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Urban soils often contaminated with metals (Pb)
Refining, smelting (aerial deposition)
Plumbing (Pb solder)
Before 1973 – additive in gasoline
Before 1977 – white pigment in paint -- PbCO3: bright white, anti-fungal
-- ends up in soil with scraping/repainting
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Risk pathways for metals leaching to groundwater (NA: city water…)
Max. in groundwater – 0.015 ppm
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Risk pathways of metals Plant uptake (maybe– “urban agriculture”…)
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Risk pathways for metals Soil ingestion
--all kids eat some dirt; some eat a lot…--accumulates in brain: neurological effects(synapse damage, behavioral, learning
disabilities, etc.)
Georgia Childhood Lead Poisoning Prevention Program (GCLPPP)
10-20 ppm typical
Loading limits soil – 300 ppm
Risk- free – 75 ppm
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Nutrients – Cu, Zn, Co
Toxic – (higher concentrations) Cd, Pb, Hg
Lead in paint – Lead Carbonate (PbCO3)
Soluble dilute acid (to make insoluble above 7 pH)
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Nine sample: (3 distances x 3 depth)
Extract with acid to dissolve Pb-- 1.0 g soil + 30 mL 0.1 M HNO3 (centr. tube)--shake 5 min; filter--analyze Pb by flame AA
mg/L x 0.03 L/0.001kg = mg/kg
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Transect
Distance (ft) 0 5 10
Depth (in)
0-11-33-6
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Assessment:> sample around older houses
-- distance from house (source)-- depth (paint deposited during
scraping)
> define area/depth that exceeds regulatorylimits:400 mg/kg: “chronic” level1200 mg/kg: “acute” level
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Remediation:Bioremediation - Indian Mustard (Lead and chromium) What is the risk pathway?
What is the extent of contamination?
What are possible fixes for problem?
What are costs vs. benefits of alternatives?
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Remediation strategy One-page paper: Introduction Materials and Methods Discussion ReferenceTo reduce exposure to childrenSpecify depths and distances