Harvesting metal from plants

In 1995, biologist Meglett of the University of Oldenburg, Russia, studied an annual herb called Eucalyptus, and unexpectedly discovered that the leaves of loquat contain abnormally high levels of metals such as zinc, lead, and cadmium. Does this indicate that there is a "hobby" that absorbs these metals from the soil? So he took this question and planted a lot of earthworms on land contaminated with metals such as zinc, lead and cadmium. The maggots were very lush and the leaves were large and thick. As a result, on one hectare of land, a lot of crickets were harvested in one season. Meglett burned the grass in an oven at 800 °C and chalked it into ashes. The result was 1.3 kg of cadmium, 23 kg of lead, and 322 kg of zinc.

Recently, an experimental team from the University of Alten in Germany has successfully introduced a Russian giant to a scrap metal dump. The pilot team has now received a large number of orders from all over Germany, especially environmental organizations, and has also established a commercial company to promote the research results. Its business activities have aroused great interest in the German military sector, as historical military maneuvers, including those used as chemical weapons warehouses during World War II, have yet to be rehabilitated to eliminate pollution, and companies have already planted them in those places. The big embarrassment to purify the environment and recover harmful metals.

Recently, there are also reports that experts in California, USA, have discovered through research that wild mustard has the function of accumulating nickel from the soil. They cut off half a hectare of wild mustard stems, dry them and then burn them into ash. Each 100 g mustard 15-20 grams of nickel were obtained in the ash. They are currently embarking on a new breed of mustard that has a stronger ability to accumulate metals. It is expected that 12 grams of nickel can be obtained from each square meter of land. Although the effect of obtaining nickel in this way is far less than other methods, it does not cause any pollution to the environment.

Scientific research proves that plants have been trained in a long process of evolution and evolution for millions of years, and that many plants have the ability to accumulate certain metallic elements. For example, leeks are good for zinc, citrons are rich in copper, tobacco is particularly rich in uranium, and Ziyunying contains selenium, wolfberry germanium, and stone pine are particularly rich in manganese. Corn or Equisetum growing in a soil containing a lot of gold can be extracted to 10 grams of gold per ton. Some plants can accumulate rare metals, such as chromium, yttrium, hafnium, ytterbium, ytterbium, etc., and are called "green and rare metal pools." Their ability to collect rare metals is several tens, hundreds, or even thousands of times higher than that of ordinary plants. Chromium, for example, is difficult to detect in normal plants using spectroscopy, but the water hyacinth can accumulate chromium in the root, and its content can reach 0.13%.

This series of discoveries has attracted great interest from scientists and is known as "green metallurgy" technology. Experts predict that if this achievement makes a breakthrough, humans will be able to obtain the desired metal by planting plants, and at the same time, they will also be able to improve the environment damaged by humans.

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