Why Mercury Still Poses Important Threats to Human Health

Mercury and our health

When we inhale, ingest, or are otherwise exposed to mercury, the element can attack our central and peripheral nervous systems, as well as our digestive tracts, immune systems, lungs and kidneys.

Specific symptoms can include tremors, insomnia, memory loss, headaches, muscle weakness, and—in extreme cases—death. Unborn babies whose mothers have high levels of mercury in their blood can be born with brain damage and hearing and vision problems. Levels of the toxic element can be measured in samples of blood, hair, or urine.

But how are we exposed to mercury in the first place? Despite a growing global awareness of how mercury threatens our health, the element continues to turn up in a number of places. Here are a few:

Dental amalgam

For more than a hundred years, mercury has been one of the primary ingredients in dental amalgam, the mixture that dentists use to fill the cavities in their patients’ teeth.

And while amalgam probably poses only a minimal threat to the health of those who walk around with it in their mouths, the use of mercury in amalgam also contributes to a gradual build-up of the toxic element in our environment.

To tackle this challenge, the Minamata Convention proposes nine specific measures to “phase down the use of dental amalgam” worldwide. The steps include setting national objectives to reduce the use of amalgam, promoting the use of mercury-free alternatives, and supporting best practices in the management of mercury waste.

Fish consumption

Seafood is the main source of protein for about one billion people around the world. Because mercury “bio-accumulates” in the food chain, larger fish such as shark, swordfish, tuna and marlin tend to be especially high in mercury.

People who consume very high amounts of seafood can be exposed to high levels of methylmercury, an organic compound that accumulates in the bodies of the fish.

Mercury poisoning from consuming marine animals has been seen among indigenous groups in many parts of the world, especially in the Arctic. Per capita seafood consumption in those communities can be up to 15 times higher than in non-indigenous groups.

A study published in 2018 found elevated levels of mercury in women of child-bearing age in island states across the Pacific, Caribbean and Indian Oceans, where fish consumption is high. Clearly, mercury pollution has accumulated across the worlds’ major oceans, contaminating the marine food chain and threatening human health.

Cosmetics

Mercury can also be found in beauty products, particularly skin-lightening creams, but also eye make-up and eye-cleansing products. While many countries have imposed laws banning mercury from cosmetics, a number of others have yet to do so, and mercury-tainted products have been found on major online retailers.

Consumers looking to avoid the toxic element should buy products from reliable vendors and ensure that their products are properly sealed and labeled. The World Health Organization has more information on the topic.

Small-scale mining

Artisanal and small-scale gold miners regularly use mercury to help them separate gold from other material, and most of that mercury ends up in the environment.

In 2015, according to the UN Environment Programme’s (UNEP) 2018 Global Mercury Assessment, artisanal and small-scale mining emitted some 800 tonnes of mercury into the air, roughly 38 per cent of the global total, and also released some 1,200 tonnes of mercury to land and water.

Mercury poisoning also represents a serious and direct health threat to the 12 million to 15 million people who work in the sector around the world. Reducing mercury emissions and releases from mining is a key goal of the Minamata Convention, which requires countries with small-scale gold mining to produce national action plans to reduce or eliminate mercury from the sector.

Coal burning

The other big source of anthropogenic mercury emissions is also a big driver of air pollution and climate change: coal burning. UNEP’s latest Global Mercury Assessment found that coal burning and other forms of fossil fuel and biomass combustion was responsible for about 24 per cent of global mercury emissions.

Although coal contains only small concentrations of mercury, people tend to burn it in very large volumes. And as the global economy grows, so too does coal burning for power generation.

The good news is that up to 95 per cent of mercury releases from power plants can be reduced by improving coal and plant performance, and improving control systems for other pollutants.

Want to learn more? Visit the website of the Minamata Convention, check out the 2018 Global Mercury Assessment, and get all the details on the upcoming Conference of the Parties.

*SOURCE: UN Environment. Go to ORIGINAL.