Baum Hedlund Aristei & Goldman changed its name to Wisner Baum in January 2023.

Glyphosate Chelating Agent

Glyphosate as a Chelating Agent: Toxic Impact on Plants and Humans

The basic biological path by which glyphosate kills plants that are not genetically modified to resist it is well known. But glyphosate produces other effects with toxic potential that have received relatively little study or attention by government agencies.

This is particularly true for glyphosate as a chelating agent. In this literature review of over 200 studies, the authors summarize the results of research into biological mechanisms that contribute to the toxicity of glyphosate and glyphosate-based herbicides (GBH). In doing so they make clear the danger that Roundup and similar formulations pose to consumer health.

Glyphosate as a Chelating Agent

Glyphosate in the Environment

The growing presence of glyphosate in the environment is a major concern. Glyphosate reaches the soil through direct application of an herbicide, when it is washed off leaves by rain, or when it is carried by wind. After plants treated with glyphosate are harvested, the plant residues left behind release glyphosate into the soil as they decay. That glyphosate may then be taken up by non-target plants.

Glyphosate also accumulates in root tissues, and binds to minerals in the soil, only to be released (and taken up other plants) later, when phosphate fertilizers are applied.

Glyphosate can persist in the soil for extended periods, with half-lives extending up to 428 days. Aminomethylphosphonic acid (AMPA), which is a product of glyphosate degradation over time, and POEA, a surfactant used to hold the herbicide to the leaf surface, are also left behind. The toxicity of AMPA closely matches that of glyphosate and POEA has also been found to be toxic to humans.

In one Finnish study, 19% of the applied glyphosate remained in the soil 20 months after it was applied, as well as AMPA in concentrations equivalent to 48% of the original glyphosate.

Glyphosate and AMPA are also found in groundwater and surface water. The amount of glyphosate permitted in drinking water in the U.S. is shockingly higher than it is in Europe. The U.S. permits 700 micrograms per liter, whereas the level allowed for pesticides in Europe is one tenth of a microgram.

Glyphosate and AMPA are also found in food and feed at levels “that could affect humans and animals negatively.” The authors report that glyphosate and AMPA residues are stable in food and feed for at least 2 years and up to 4 years. More than 50% of urine samples collected in one German study contained measurable levels of glyphosate and AMPA.

Glyphosate as a Chelating Agent

The word “chelation” comes from a Greek word meaning a crab’s claw. Some molecules are able to “grab” metals by forming a chemical bond with them. That process is called chelation and the molecule doing the grabbing is the chelating agent.

Chelating agents can grab heavy metals that are poisoning soil and groundwater and make them available for uptake by plants. This can be used to clean up toxic soil and groundwaters by trapping heavy metals in plants. But it can also increase plant toxicity.

Chelating agents can also harm plants by impeding the uptake of trace minerals that are essential to plants and organisms. By forming chemical bonds with micronutrients such as iron, zinc, manganese, boron, molybdenum, and cobalt, chelating agents inhibit the ability of plants to take up these minerals.

In short, a glyphosate chelating agent may affect plants in two ways, either by increasing their toxicity or by limiting their micronutrient uptake, which could reduce micronutrient uptake by humans.

The authors cite several greenhouse studies that demonstrated negative effects on crops that have been genetically modified to resist glyphosate. Among the effects seen in these studies are lowered micronutrient and macronutrient (calcium, magnesium, nitrogen, potassium, and phosphorus) concentrations in the plants. These nutrients play critical roles in human health and development.

Zinc Deficiency

A report from Oregon State University calls zinc deficiency a global concern, citing a study that found “DNA damage in humans caused by only minor zinc deficiency.” Zinc deficiency is a major problem in Africa and South-east Asia, where glyphosate resistant crops are heavily promoted by Monsanto. According to a report from the World Health Organization, “zinc deficiency was estimated to cause 176,000 diarrhea deaths, 406,000 pneumonia deaths and 207,000 malaria deaths.” (See Chapter on Zinc Deficiency.)

Glyphosate also has similar effects on non-glyphosate resistant (GR) plants. One of the dangers of herbicides is that plants that were not intended to be sprayed become exposed to the poison. This can happen through the air (called “drift”) or via herbicide-contaminated soil. The authors review one study in which scientists simulated the exposure of sunflowers at levels that would be expected due to glyphosate drift or glyphosate residues in the soil. This resulted in a substantial reduction in the plants’ uptake of iron and manganese. The authors of the drift study concluded that glyphosate residues or drift may result in severe impairments in iron and manganese in nontarget plants. (Iron deficiency is a common problem in soybean production, 90% of which comes from Roundup Ready crops.)

The authors of this review make an important point regarding glyphosate as a chelating agent. There are other chemicals in commercial formulations of Roundup that may also act as chelating agents. Other additives may enhance glyphosate’s chelating ability. Consideration of these factors, say the authors, is not a regular part of the approval process for glyphosate formulations like Roundup.

Glyphosate – Impact on Plant Microorganisms

Glyphosate also effects microorganisms that interact with plants. Certain bacteria, for example, transform nitrogen in the atmosphere into nitrogen-containing compounds (e.g., ammonia) that plants can use. This is known as nitrogen fixation.

Reduced nitrogen fixation has been reported both in glyphosate-resistant soybeans and in non-glyphosate-resistant soybeans exposed to spray drift rates of glyphosate. In other research, beneficial bacteria that resisted fungal pathogens and provided manganese in a form that could be taken up by plants, were significantly reduced by glyphosate. Manganese-deficient plants are more vulnerable to root-infecting pathogens.

Other micronutrients (calcium, magnesium, iron, zinc, copper) affected by glyphosate also play a role in plant disease. Microorganisms in the soil around the roots of a plant, an area known as the rhizosphere, are also affected by micronutrient availability. Researchers who studied microorganisms in the rhizosphere of glyphosate-resistant corn and soybean plant roots found evidence of decreased availability of several nutrients in the soil, including iron, nitrogen, and phosphorus. They pointed to glyphosate’s chelating action as a likely explanation for the reduced bioavailability.

Glyphosate – Impact on Humans and Animals

According to the authors of this review, “… food and feed derived from GBH [glyphosate-based herbicides] treated plants can contain significant amounts of glyphosate and AMPA residues and probably also residues of formulants such as POEA.” POEA (polyethoxylated tallowamine) is a surfactant that is added to increase glyphosate’s penetration of the leaf surface.) POEA and several other “formulants” – allegedly inert substances that are added to Roundup – have been found to be far more toxic than glyphosate.

Several scientists have proposed that glyphosate residues and low levels of micronutrients in foods from GBH treated plants contribute to several diseases in the United States. Many of the factors associated with celiac disease are explainable as the effects of glyphosate’s effects, including deficiencies in trace minerals such as iron, cobalt, molybdenum, and copper. Other investigators have tied manganese deficiencies to neurological diseases, such as autism, Alzheimer’s, and Parkinson’s disease.

The impact of glyphosate as a chelating agent for heavy metals surfaced in research conducted in Sri Lanka, where researchers linked simultaneous exposure to heavy metals and glyphosate to chronic kidney disease. The disease has become a significant public health problem in certain regions.

The authors, who are based in Germany, point out that the European Food Safety Authority “did not provide data on potential impacts of glyphosate on plant nutrient availability” or its impact as a chelator in is review of glyphosate. They call for further research into the impact of glyphosate as a chelating agent as well as other formulants found in glyphosate-based herbicides.

Summary Information

Glyphosate, a chelating agent—relevant for ecological risk assessment?

Martha Mertens1, Sebastian Höss1, Günter Neumann2, Joshua Afzal2, Wolfram Reichenbecher3

  1. Institute for Biodiversity Network e.V. (ibn), Nußbergerstr. 6a,93059 Regensburg, Germany
  2. Institute of Crop Science (340h), University of Hohenheim,70599 Stuttgart, Germany
  3. Federal Agency for Nature Conservation (BfN), Konstantinstr. 110,53179 Bonn, Germany

Environmental Science and Pollution Research, published online, January 2, 2018

Partly funded by a Grant of the German Federal Agency for Nature Conservation, “Glyphosat als Komplexbildner – Stand des Wissens.”

  • Hardeman v. Monsanto Co. $80 Million
  • Dewayne “Lee” Johnson v. Monsanto Co. $289.2 Million
  • Pilliod et al. v. Monsanto Co. $2 Billion
  • Best Law Firms 2023
    Best Law Firms 2023

    A ranking in The U.S. News – Best Lawyers® “Best Law Firms” is widely regarded by both client and legal professionals as a significant honor. It is considered the most reliable, unbiased source of legal referrals anywhere.

  • The Truck Safety Coalition
    The Truck Safety Coalition

    Wisner Baum is proud to be a sponsor of The Truck Safety Coalition, a a group of caring individuals dedicated to reducing the number of deaths and injuries caused by truck-related crashes. Our support enables them to help families and save lives.

  • California Powerhouse
    California Powerhouse

    Law360 recognizes law firms that have a strong regional presence, working on important matters within their home state. “[Wisner Baum] possesses a David v. Goliath-sized slingshot while seeking justice for everyday citizens it believes were harmed or killed through corporate wrongdoing.”

  • Elite Trial Lawyers
    Elite Trial Lawyers

    NLJ and American Lawyer Media honor law firms and attorneys as Elite Trial Lawyers for their cutting-edge legal work on behalf of plaintiffs in practice areas ranging from mass torts to securities litigation.

  • Listed in Best Lawyers
    Listed in Best Lawyers

    Best Lawyers is the oldest and most respected peer-review publication in the legal profession. A listing in Best Lawyers is widely regarded by both clients and legal professionals as a significant honor, conferred on a lawyer by his or her peers.

  • AV Top Ranked Law Firm
    AV Top Ranked Law Firm

    Less than one-half of one percent of firms across the nation have achieved this ranking. A firm must have a high percentage of lawyers who have achieved the prestigious AV® Preeminent rating by Martindale-Hubbell®.

  • Verdicts Hall of Fame
    Verdicts Hall of Fame

    The National Law Journal inducted Wisner Baum into the Verdicts Hall of Fame for obtaining the $2 billion landmark verdict in the Roundup cancer case of Pilliod et al. v. Monsanto. The verdict was #1 in California and #2 in the U.S. in 2019 and is #9 in American history.

  • Super Lawyers
    Super Lawyers

    Super Lawyers is a rating service of outstanding lawyers from more than 70 practice areas who have attained a high-degree of peer recognition and professional achievement.

  • National Trial Lawyers Top 100
    National Trial Lawyers Top 100

    The National Trial Lawyers Top 100 recognized the law firms of Wisner Baum, the Miller Firm and Audet & Partners with the 2019 Trial Team of the Year award (in the Mass Torts category) for their work in the groundbreaking case of Dewayne “Lee” Johnson v. Monsanto Company.

  • AV Preeminent Peer Review Rated
    AV Preeminent Peer Review Rated

    An AV® rating reflects an attorney who has reached the heights of professional excellence. The rating signifies the highest legal ability, and very high adherence to professional standards of conduct, ethics, reliability, and diligence.

  • Avvo 10.0 Rating
    Avvo 10.0 Rating

    Wisner Baum is proud to have all of its lawyers listed in Avvo, a legal directory connecting people in need of legal services with lawyers and connecting lawyers to lawyers. Eight of our attorneys have earned a 10.0 perfect rating with Avvo.

  • Top Jury Verdict in <br> CA and USA
    Top Jury Verdict in
    CA and USA ranks our $2 billion verdict in Pilliod et al. v. Monsanto as the biggest verdict in California and the second largest verdict in the U.S. in 2019. It is the ninth largest verdict in U.S. history.

  • Lawdragon 500 Leading Plaintiff Consumer Lawyers
    Lawdragon 500 Leading Plaintiff Consumer Lawyers

    Published annually, the Lawdragon 500 Leading Plaintiff Consumer Lawyers list recognizes the “best of the best” in this area of the law through nominations, research, and review by a board of their peers.

  • Product Liability Practice Group of the Year
    Product Liability Practice Group of the Year

    In 2020, Law360 honored the law firms ”behind the litigation wins and major deals that resonated throughout the legal industry.” It recognized our success in several landmark cases.

  • Top Personal Injury Jury Verdict in California
    Top Personal Injury Jury Verdict in California

    In 2018, our $289 million Johnson v. Monsanto verdict was the largest personal injury verdict in California. also ranked it #2 among all verdicts in California and #10 in the nation.

  • Bar Register of Preeminent Lawyers
    Bar Register of Preeminent Lawyers

    The Bar Register is the definitive guide to the most distinguished law firms in America. It includes only those select law practices that have earned the highest rating in the Martindale-Hubbell Law Directory and have been designated by their colleagues as preeminent in their field.


Firm Reviews

What Our Clients Are Saying
  • I Can’t Imagine a Better Law Firm

    “Multiple lawyers recommended Wisner Baum to me and I have been consistently impressed with the quality of their work.”

    - Best Law Firms Survey
  • They Are About Changing the Systems...

    “Wisner Baum are not only amazing attorneys but more importantly, they are activists. They are about changing the systems which got us into trouble in the first place. They understand their role in the process of making change.”

    - Kim Witczak
  • Top Legal Minds in the Country

    “The Wisner Baum firm has some of the top legal minds in the country; they are driven, determined, trustworthy, ethical and passionate.”

    - From Best Lawyers® Best Law Firms
  • Diligent & Professional Representation

    “Thanks to your efforts I was able to recover from a tragic experience and turn my life around for the best.”

    - W.T.
  • Our Best Interest Was Always Number One on Your List

    “A special thank you to your Spanish-speaking staff for the extra effort put into this case. The language barrier was never a problem, and we are so very thankful to them. Your name holds much respect in our family.”

    - G.C. & C.C