Tag Archives: lead pollution

The Perils of Inhaling Lead Dust: Zambia

Kabwe,  in Zambia,  sprung up around a mine founded in 1904 by the Rhodesian Broken Hill Development Company, a British colonial firm. For decades miners crushed and burnt ore to extract lead. That metal made Kabwe but it also devastated it. To this day lead particles blow across town, making their way into houses and bloodstreams.

Scientists generally consider soil hazardous if it has more than 400mg of lead per kilogram. In three townships near the old mine the soil contains six, eight and 15 times that amount, according to analysis in 2014 by Pure Earth, an environmental ngo. “Kabwe is the most toxic place I’ve ever been to,” says Richard Fuller, its president…

The pollution in Kabwe is a scandal. Yet responsibility for it has long been contested, and that is set to continue. In October 2020, Mbuyisa Moleele Attorneys, a South African law firm, with help from Leigh Day, a British one, announced a class-action lawsuit against a subsidiary of Anglo American on behalf of potentially more than 100,000 children and women of reproductive age in Kabwe. It is targeting Anglo because it was affiliated to the mine from the 1920s until shortly after Zambia’s mines were nationalised in 1970. The suit claims that most of the pollution stems from the period when the mine was under the de facto control of Anglo, which allegedly did not do enough to stop the harm. Anglo rejects the claims, arguing that its involvement ended five decades ago and that, before then, it was neither the operator nor a majority shareholder in the mine and thus not responsible.

The case may take years. The lawyers for the plaintiffs must first convince a South African court to take it on. Only then may it proceed to a trial. Meanwhile children in Kabwe will keep on playing in the dust.

The World Bank included Kabwe in a broader project it funded to clean up Zambian mines. The scheme, which ran from 2003-2011, had some successes. It dredged a toxic canal and buried some contaminated soil. But it did not treat the main source of the dust—the former mine and dumps—and it left roads unpaved and most houses untreated…Another clean-up funded by the bank was started in December 2016. But it, too, is struggling. Some children have been tested and have received therapy to reduce blood lead levels. But since little has been done about the lead in the environment there is a risk their levels will rise again. 

Excerpt from Mining’s Toxic Legacy: Lead Astray, Economist,  Dec. 12, 2020

Lead and Mercury in the Seas

The levels of lead and mercury in the sea reduce noticeably following concrete actions to limit their release, recent research at the IAEA using nuclear techniques has shown. The banning of leaded petrol and the closure of a mercury discharging plant have led to decreases in pollution levels over 10-15 years.

This is the case for lead, which when consumed by fish which is in turn eaten by people, can cause damage to the human nervous system and internal organs. Many different activities such as mining or smelting in metallurgy and the burning of coal as well as lead’s use in batteries, paint, ceramics and other everyday items can release it into the environment. The biggest source of lead pollution in the last century was related to the use of leaded petrol.

As part of efforts to develop new methods to determine the source and levels of lead pollution, researchers at the IAEA Environment Laboratories analysed sediments from the Baltic Sea and the Caribbean Sea. In mapping the pollution history in a sediment core from the Baltic coast of Germany, researchers could clearly observe that within 10 to 15 years of phasing out lead in petrol by 1996, lead pollution levels in the sea had decreased..

In addition, IAEA researchers have successfully developed methods to use lead isotope ratios to determine the source of lead pollution and assess whether it is naturally present or the result of anthropogenic activities, since natural and anthropogenic lead sources will show different isotopic fingerprints and isotope compositions….

IAEA scientists’ analysis of a dated sediment core in a Caribbean bay shows total mercury (Hg) levels rapidly decreased after the closure of a discharging plant…Mercury was used in an alkali plant there as a catalyser, and in the 1970s, high concentrations were found in water, sediments and marine organisms as a result of discharges from the plant.  Years later, after the plant had been closed, IAEA researchers showed, by analysing sediment core taken from the bay, that levels of total mercury had started to decrease.  While remnants of this pollution are still buried in the sediment, acute toxicity has been greatly reduced.

Excerpts from World Oceans Day 2018: Regulating Lead and Mercury Releases has Decreased Marine Pollution, IAEA Press Release, June 8, 2018