Soil Contaminant Concentrations at Urban Agricultural Sites in New Orleans, Louisiana

A Comparison of Two Analytical Methods

Keywords: ICP-AES, Lead, Arsenic, XRF, Soil Contamination, Urban Agriculture

Abstract

Along with the many benefits of urban agriculture comes the possible exposure to contaminants not typically seen in rural soils. Through the use of standard laboratory analyses (ICP-AES and CVAAS) and a field-portable X-ray fluorescence spectrometer (XRF) calibrated for soil analysis, this study quantified contamination levels at urban agricultural sites throughout New Orleans, Louisiana. The results of the standard laboratory analyses were compared to the results from the XRF.  We collected soil samples at 27 urban and suburban farm and garden sites from the Greater New Orleans area. We analyzed the soil samples for arsenic, cadmium, chromium, cobalt, copper, mercury, lead, nickel, and zinc using the XRF and standard methods. Most sites had median con­centrations significantly below Louisiana’s soil standards. Paired soil samples showed XRF results were significantly higher than laboratory results for all metals but copper. Only lead (ρ=0.82, p<0.0001) and zinc (ρ=0.78, p=0.0001) were highly correlated. Poor correlation of results between XRF and standard methods make the standard methods preferred.

Author Biographies

Kyle M. Moller, Tulane University

Tulane University, School of Public Health and Tropical Medicine, Department of Global Environmental Health Sciences

James G. Hartwell, Tulane University

Tulane University, School of Public Health and Tropical Medicine, Department of Global Environmental Health Sciences

Bridget R. Simon-Friedt, Tulane University

Tulane University, School of Public Health and Tropical Medicine, Department of Global Environmental Health Sciences

Mark J. Wilson, Tulane University

Tulane University, School of Public Health and Tropical Medicine, Department of Global Environmental Health Sciences

Jeffrey K. Wickliffe, Tulane University

Tulane University, School of Public Health and Tropical Medicine, Department of Global Environmental Health Sciences

Published
2018-06-20
How to Cite
Moller, K., Hartwell, J., Simon-Friedt, B., Wilson, M., & Wickliffe, J. (2018). Soil Contaminant Concentrations at Urban Agricultural Sites in New Orleans, Louisiana. Journal of Agriculture, Food Systems, and Community Development, 8(2), 139-149. https://doi.org/10.5304/jafscd.2018.082.010