Soil Amendments to Decrease Lead and Arsenic Bioaccessibility in Delray, Detroit, MI

Soil amendments;Soil lead bioaccessibility;Soil arsenic bioaccessibility;Natural resources and environment;Environmental Science, College of Arts, Sciences, & Letters

Mankiewicz, RoseSampson, Natalie ;

University of Michigan

关键词: Soil amendments;    Soil lead bioaccessibility;    Soil arsenic bioaccessibility;    Natural resources and environment;    Environmental Science, College of Arts, Sciences, & Letters;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/143528/49698122_Final%20MSES%20Thesis%20Submission%20-%20Mankiewicz%204-27-18.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

The Delray neighborhood of Southwest Detroit has a long history of environmentalpollution. A section of the neighborhood, located adjacent to a brownfield site, was previously identified for elevated concentrations of soil lead (Pb) and arsenic (As) byresearchers at the University of Michigan-Dearborn (Peterman, 2013). In this study, soilsamples were collected from three decision units using the Incremental SamplingMethodology (ISM). Samples were treated at 5 and 10% by weight with three differentamendments: triple superphosphate (TSP), phosphate rock (PR), and zeolite (ZE). After an incubation period of 48 days, the samples were then processed, underwent bioaccessibility (BA) digestion, and analyzed by ICP-MS for Pb and As. Statistical analysis using a paired t-test showed a very significant decrease in soil Pb BA for both addition rates of PR, and a significant decrease with TSP and ZE. The impact of the amendmentson soil As BA was inconclusive. Based on this study, PR shows potential as an efficient and affordable means to remediate the soil Pb contamination in Delray. This finding may also be applicable for other postindustrial cities with similar soil type and contamination profiles.