Soil Research
Research into making soil less toxic are going on all around the country. But since lead is a naturally occurring element, it "never goes away," the best ways to reduce lead hazards in soil involve sequestering lead where it can't come in contact with humans.
Mulch studies
Garden Mulches [fact sheet] University of New Hampshire
March 17, 2022. Michigan State University Extension Lead concerns for gardeners: Mitigating risk
US EPA Gardening in Lead-Contaminated Soil
University of Wisconsin. Lead in Home Garden Soil.
Ohio Department of Health. Lead Contamination in Gardens. Learn about the harmful effects of lead and tips on how to safely garden in soil that contains lead.
Research on Lead Bioaccumulators
November 2022. Journal of Hazardous Materials Letters. Bioaccumulation of lead (Pb) and its effects in plants: A review
2020 Apr. Int J Environ Res Public Health Lead Toxicity: Health Hazards, Influence on Food Chain, and Sustainable Remediation Approaches
Studies
Jan 25, 2024. KSHD Promising results': K-State PhD students work in KC to pioneer cost-effective way of reducing lead in soil. "Researchers and PhD students with Kansas State University are using Kansas City as a model to pioneer a cost-effective and efficient way of reducing lead's presence in soil through the use of environmentally safe chemicals."
Potential of Industrial Hemp for Phytoremediation of Heavy Metals. "The accumulation of anthropogenic heavy metals in soil is a major form of pollution. Such potentially toxic elements are nonbiodegradable and persist for many years as threats to human and environmental health. Traditional forms of remediation are costly and potentially damaging to the land. An alternative strategy is phytoremediation, where plants are used to capture metals from the environment. Industrial hemp (Cannabis sativa) is a promising candidate for phytoremediation. Hemp has deep roots and is tolerant to the accumulation of different metals. In addition, the crop biomass has many potential commercial uses after harvesting is completed. Furthermore, the recent availability of an annotated genome sequence provides a powerful tool for the bioengineering of C. sativa for better phytoremediation."
There's been some research on the use of Triple Superphosphate Phosphate (TSP) on soil to bind to lead and make the lead insoluble so that it can't be absorbed by the body.
Zeolite? What can the studies tell us?
Kitty litter? https://news.yahoo.com/common-cat-litter-ingredient-help-103010092.html. We never heard of this before! More research needed.