Well-groomed hair is a symbol of beauty for many black African women. Natural hair requires special care and attention, though, which can be time consuming. Wigs (human or synthetic hair), weave-ons and other artificial hair ...
Analytical Chemistry
Jun 24, 2024
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24
As many parts of the developing world experience rapid economic growth, the quality of their water supplies is coming under increasing strain. To keep pace with a growing demand for water, there is now a pressing need for ...
Environment
Jun 17, 2024
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0
A research team developed new equipment that achieved fully automatic and unmanned detection of soil nutrients (such as organic matter, available potassium, available phosphorus) and heavy metals (including Pb, Cd, Hg, As, ...
Biotechnology
May 30, 2024
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1
Ammonia is the starting point for the fertilizers that have secured the world's food supply for the last century. It's also a main component of cleaning products, and is even considered as a future carbon-free replacement ...
Analytical Chemistry
May 28, 2024
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32
For 140 years, gold mines in Johannesburg, South Africa have been leaking wastewater contaminated with heavy metals. The acid mine drainage from Johannesburg's estimated 278 abandoned mines and 200 mine dumps includes uranium ...
Environment
May 24, 2024
0
63
It's become common to read that microplastics—little bits of plastic, smaller than a pencil eraser—are turning up everywhere and in everything, including the ocean, farmland, food and human bodies. Now a new term is gaining ...
Environment
May 7, 2024
0
12
Dead stars known as white dwarfs, have a mass like the sun while being similar in size to Earth. They are common in our galaxy, as 97% of stars will eventually become white dwarfs. As stars reach the end of their lives, their ...
Astronomy
May 3, 2024
5
1793
For decades, concerns about automobile pollution have focused on what comes out of the tailpipe. Now, researchers and regulators say, we need to pay more attention to toxic emissions from tires as vehicles roll down the road.
Environment
May 1, 2024
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100
A team of chemists at Lake Superior State University, working with colleagues from Wayne State University, both in Michigan, and two representatives from JEOL U.S., a lab equipment maker, has found that some cannabis rolling ...
Warming temperatures are causing a steady rise in copper, zinc, and sulfate in the waters of Colorado mountain streams affected by acid rock drainage. Concentrations of these metals have roughly doubled in these alpine streams ...
Earth Sciences
Apr 23, 2024
0
27
A heavy metal is a member of an ill-defined subset of elements that exhibit metallic properties, which would mainly include the transition metals, some metalloids, lanthanides, and actinides. Many different definitions have been proposed—some based on density, some on atomic number or atomic weight, and some on chemical properties or toxicity. The term heavy metal has been called "meaningless and misleading" in an IUPAC technical report due to the contradictory definitions and its lack of a "coherent scientific basis". There is an alternative term toxic metal, for which no consensus of exact definition exists either. As discussed below, depending on context, heavy metal can include elements lighter than carbon and can exclude some of the heaviest metals. Heavy metals occur naturally in the ecosystem with large variations in concentration. Nowadays anthropogenic sources of heavy metals, i.e. pollution, have been introduced to the ecosystem. Waste derived fuels are especially prone to contain heavy metals so they should be a central concern in a consideration of their use.
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