Toxic E-Waste Chemicals Found in Endangered Marine Mammals
Toxic chemicals from electronic waste, specifically from screens on televisions, computers, and smartphones, have been detected in the brains and bodies of endangered dolphins and porpoises in the South China Sea.
A study published in Environmental Science & Technology revealed significant levels of gene-altering liquid crystal monomers (LCMs) in Indo-Pacific humpback dolphins and finless porpoises.
LCMs, which are synthetic organic compounds used to manufacture screens for devices, help regulate light transmission, ensuring clear images for users.
Scientists are especially concerned about LCM pollutants because they infiltrate air, waterways, and oceans.
“These chemicals were designed for stability to extend their lifespan inside screens,” noted Yuhe He, a researcher from City University of Hong Kong and one of the study’s authors. “Ironically, that very stability becomes a problem in the environment since they don’t break down easily.”
Previous research has shown that these pollutants pose health risks not only to marine life but also to humans.
The toxins found in dolphins and porpoises have also been identified in their food sources, like fish and invertebrates, indicating that LCMs are ingested through the food chain.
He and his team analyzed tissue samples from these endangered species over a span of 14 years, screening for 62 different liquid crystal monomers across samples of blubber, muscle, liver, kidney, and brain tissue.
During this time, manufacturers started replacing LCMs with LEDs in screens. Interestingly, the researchers observed a correlation between the rising use of LEDs and the declining levels of LCMs found in these marine animals.
Further analysis indicated that the four most detected types of LCMs were linked to changes in DNA repair and cell division in dolphin cells.
Even though the highest concentrations of toxins were found in blubber, the presence of small amounts in the dolphins’ brains was surprising, suggesting these chemicals can breach the blood-brain barrier.
“The detection of LCMs in their brains is particularly concerning,” He stated. “If these substances can penetrate a dolphin’s blood-brain barrier, we must be wary about potential impacts on humans who may consume contaminated seafood or drinking water.”
Electronic waste is becoming a significant global issue, with around 62 million tonnes generated annually. The rapid production of inexpensive, often poorly made electronics, referred to as “fast tech,” contributes to this problem, especially devices that use LCMs.
The researchers emphasized the importance of extending the lifespan of electronics through repairs and proper disposal methods to mitigate damage.
They also called for stricter regulations regarding persistent chemicals in consumer electronics before they hit the market.
“While we don’t have direct proof of the impact on human health yet, our lab tests on dolphin cells suggest these chemicals can disrupt gene activity involved in DNA repair and cell division,” He added.
“This serves as a warning. If we wait until human health impacts are irrefutably proven, it might already be too late. Proactively addressing e-waste regulations is crucial for preventing a future public health crisis.”
