Miseries, contribution and greatness of Robert Bunsen

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Born into a family of scholars and well versed in many disciplines, chemistry Bunsen made their field of choice. After earning his doctorate at the age of nineteen, Bunsen visited partially funded by the government throughout Europe, where he met many chemists and engineers. His travels gave him a network of contacts he has used during his career. Upon his return, and having taught at several universities, was created in a teaching position at the University of Heidelberg in 1852, where he remained until his retirement in 1889.

Bunsen was an avid experimenter. He spent much of his time in the lab seeks to understand the composition of chemicals. His early research concerned the properties of arsenic and its compounds. In particular, the chemical composition of a particular class of chemicals called cacodylic, was unknown. Their experiments showed that the arsenic oxides were cacodylic. But the work of arsenic Bunsen nearly cost him his life?? It almost killed by arsenic poisoning and lost the sight in one eye during his experiments with cacodylic.

Arsenic is the twentieth most abundant element in the earth’s crust, with an average concentration of about 2 ppm. Arsenopyrite (FeAsS) is the most common mineral. Arsenic occurs widely in nature, and most abundant in sulphide minerals and products of volcanic eruptions. The concentrations of arsenic in rocks and soil is highly variable, the highest concentrations are found in areas of hydrothermal sulfide mineralization. Arsenic has two common oxidation states +5, predominated and the less thermodynamically stable 3. Arsenic is twenty-three isotopes, one of which (mass 75) is stable. The other isotopes have short half-life.

Traces of arsenic in groundwater occur because it can cause cancer in humans of concentrations in drinking water of 300 ppb. U.S. Environmental Protection Agency (EPA) has proposed reducing the maximum allowable concentration of arsenic in drinking water of the United States from 50 to 5 ppb. The lower end is still controversial. The properties of sulfides of arsenic were known by doctors and “prisoners professional” in the V century a. C. Albertus Magnus (1193â?? 1280) is credited with having isolated by heating auripigment elemental arsenic (As2S3) with soap.

The beneficial effects of arsenic compounds have long been known. Arsenic has been important in the development of metallurgy in the beginning of the Bronze Age and later as a pigment and as an ingredient of war incendiary. Since ancient times, the classical formulations of arsenic have been prescribed to treat the disease. Historically, arsenic compounds were the alchemical ingredients and the secret art of poisoning has been a part of the social and political life of many societies. arsenic toxicity resulted in the death of artists pigments mixed with arsenic.

rights between 1850 and 1950 have been regularly exposed to arsenic in medicine, food, air and water. Consumer products of the era include pigments containing arsenic, medicated soaps, embalming solutions, envelopes, stickers, glass, flying dust and rat poison. Currently, arsenic is a component of wood preservatives, pesticides, non-ferrous alloys, and the manufacture of semiconductors. Arsenic can be released into the environment of the metal smelting and coal combustion. Â

Like its leading edge research to studies of gases and alkali metals, Bunsen recognized the importance of developing new methods to analyze and identify chemicals. The importance of quantitative analysis has been made in the eighteenth century. The chemicals needed to continue to study the composition of a substance to help explain the physical world. Bunsen has recognized this need and worked to develop new tools to this end. For instance, invented new types of fuel cells and galvanic carbonzinc, or batteries, to isolate the barium and sodium. He also built a new type of ice calorimeter which measures the volume, rather than the mass of melted water. This allowed Bunsen to measure the specific heat of a metal to find its atomic weight.

Bunsen most enduring contribution to chemistry was, however, spectroscopy, developed in collaboration with the German physicist Gustav Kirchhoff. Bunsen interested in analysis of the color emitted by heating to chemical light. He learned that Kirchhoff has been involved in similar work, and in 1854, Bunsen Kirchhoff joined the University of Heidelberg. When Kirchhoff suggested that seeing the light that is emitted by the elements of scattering of light by a prism, the science of spectroscopy is born. When viewed through a prism, they found that the light is decomposed into a series of lines, called spectral lines. Bunsen and Kirchhoff found that the light emitted by each substance has its own pattern of spectral lines?? A discovery that led to the spectroscopic method of chemical analysis.

It was during the development process spectroscopy Bunsen burner which came into existence. Bunsen realized that the spectral patterns observed have been contaminated by the light of the fire they use for heating elements. Update the burner works with the mixture of air in the gas before burning to get a high temperature, the non-luminous flame.

Using the new burner, Bunsen and Kirchhoff have been able to clearly see the spectra of all the chemicals they were studying. Overall, classified the spectra of all known elements. This chemical helps tremendously, because thanks to the identification of spectral models, chemists can determine the composition of an unknown substance. In the process of cataloging the spectra of elements, Bunsen and Kirchhoff discovered two new elements to name the colors of their spectral lines: Cesium (blue) and rubidium (red). Using the new technique Bunsen and Kirchhoff analytical spectroscopy and that the next development, many new elements have been discovered subsequently. But not only opened the door for a spectroscopic analysis of terrestrial substances, the composition of stars could now also be deducted.

Bunsen was a very modest man, while being honored by some of the most prestigious scientific institutions in Europe. In 1853 he was elected to the Chemical Society of London and the Academy of Sciences of Paris. He was elected to the Royal Society of London in 1858 and received its Copley Medal in 1860. Bunsen and Kirchhoff have received the Davy Medal in 1877 for leading the development of spectroscopy. In his retirement in 1889, Bunsen turned his attention to another of his interests throughout, geology. Bunsen contributions to chemistry included not only the Bunsen burner, but many other instruments that have enabled the physical world to see how news and information. Â

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