Scientists from China and the United States have identified numerous toxic elements in the emissions from an e-waste recycling workshop in southern China, which uses low-tech methods to separate reusable electronic components from the circuit boards. It is not an isolated case, the scientists point out; such methods are used all over China.
Results of their study have been published in the journal Atmospheric Environment.
“The most immediate problem is the health of the workers and the people who live in the city,” said Bernd R.T. Simoneit, a professor emeritus at Oregon State University and one of the authors of the study. “But this may also be contributing to global contamination. For example, previous studies have found carcinogens in wind-carried dust from Asia.”
Simoneit is a widely published scientist who has been involved in numerous studies identifying chemical “signatures” for emissions, including coal smoke, biomass burning, petroleum-based fuels and even the burning of municipal refuse. By using mass spectrometers and other sophisticated instrumentation, the researchers can pinpoint the contributions of specific emissions to the atmosphere.
Their work in China was conducted in Shantou City, a town of 150,000 people located in southern China’s Guangdong Province. They collected samples during four working days, when workers were removing the electronic components by heating the circuit boards over grills on stoves burning coal briquettes.
The workshop had 24 stoves along three walls, and an estimated five tons of circuit boards stacked along the fourth wall for processing. Workers would use the grills to melt the solder, and then remove reusable portions of the circuitry.
The research team included five Chinese scientists and Simoneit, who has dual appointments in OSU’s College of Oceanic and Atmospheric Sciences and the Department of Chemistry. The researchers found that through this “roasting process,” numerous organic chemicals, heavy metals, flame retardants and persistent organic pollutants (or POPs) were emitted into the air via the smoke. The chemical signature created by this process of roasting or toasting circuit boards “is unmistakable.”
“The next step is to see to what extent this is harming the environment and creating a health hazard for both the workers, and people living in the path of the emissions – either through inhalation, or exposure to the skin,” Simoneit said. “Some of these chemical compounds may be carcinogens; others may be just as harmful because they can act as ‘environmental disruptors’ and may affect body processes from reproduction to endocrine function.”
The Chinese authors of the study are affiliated with the Chinese Academy of Sciences and include lead author Xinhui Bi, with ZhenZhen Wang, Xinming Wang, Guoying Sheng and Jiamo Fu.
Simoneit also is working with scientists in India to identify chemical signatures from the burning of wire and other materials, which is done to recycle copper and other minerals. And he is working in Saudi Arabia on a different problem – helping develop “green chemistry” methods for recycling that country’s massive urban waste to create methane.
About the OSU College of Oceanic and Atmospheric Sciences: COAS is internationally recognized for its faculty, research and facilities, including state-of-the-art computing infrastructure to support real-time ocean/atmosphere observation and prediction. The college is a leader in the study of the Earth as an integrated system, providing scientific understanding to address complex environmental challenges.
Bernd Simoneit | EurekAlert!
Waste in the water – New purification techniques for healthier aquatic ecosystems
24.07.2018 | Eberhard Karls Universität Tübingen
Plenty of habitat for bears in Europe
24.07.2018 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig
Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.
When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...
Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.
Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....
Proteins must be folded correctly to fulfill their molecular functions in cells. Molecular assistants called chaperones help proteins exploit their inbuilt folding potential and reach the correct three-dimensional structure. Researchers at the Max Planck Institute of Biochemistry (MPIB) have demonstrated that actin, the most abundant protein in higher developed cells, does not have the inbuilt potential to fold and instead requires special assistance to fold into its active state. The chaperone TRiC uses a previously undescribed mechanism to perform actin folding. The study was recently published in the journal Cell.
Actin is the most abundant protein in highly developed cells and has diverse functions in processes like cell stabilization, cell division and muscle...
Scientists have discovered that the electrical resistance of a copper-oxide compound depends on the magnetic field in a very unusual way -- a finding that could help direct the search for materials that can perfectly conduct electricity at room temperatur
What happens when really powerful magnets--capable of producing magnetic fields nearly two million times stronger than Earth's--are applied to materials that...
The quality of materials often depends on the manufacturing process. In casting and welding, for example, the rate at which melts solidify and the resulting microstructure of the alloy is important. With metallic foams as well, it depends on exactly how the foaming process takes place. To understand these processes fully requires fast sensing capability. The fastest 3D tomographic images to date have now been achieved at the BESSY II X-ray source operated by the Helmholtz-Zentrum Berlin.
Dr. Francisco Garcia-Moreno and his team have designed a turntable that rotates ultra-stably about its axis at a constant rotational speed. This really depends...
08.08.2018 | Event News
27.07.2018 | Event News
25.07.2018 | Event News
14.08.2018 | Information Technology
14.08.2018 | Life Sciences
14.08.2018 | Life Sciences