silver nano particles by nature

Silver nanoparticles have many benefits in human life, especially as antifungal agents (fungi) and antibakteria so frequently used in consumer product industries. However, the presence of silver nanoparticles in the industry not only alone, but also on the environment, especially the aquatic environment. Lately concentration of silver nanoparticles was found to increase in that concern environmental scientists to further investigate the origin of the silver nanoparticles.
A fact that is surprising is revealed: Nature can create silver nanoparticles. Joint research team from the Florida Institute of Technology (FIT), State University of New York (SUNY), and the National Institute of Standards and Technology (NIST) reported that silver ions and humic acids (humic acid) can form stable silver nanoparticles. They analyzed samples of river sediment humic acid estimated by TEM (transfer electron microscopy) and discovered that silver nanoparticles enveloped humic acids form stable structures. Humic acid is a complex mixture of many organic acids are formed from the decomposition of organic matter. Through TEM characterization, it appears that silver nanoparticles enveloped humic acid which makes it stable as it prevents contact of silver nanoparticles to join the larger silver particles. Silver nanoparticle characterization results are golden brown as a consequence of the size of the silver particles. The entire metal nanoparticles has its own color characteristics because the size is very small (nanometer = one billionth of a meter). This effect is called "surface plasma resonance" that occurs due to simultaneous oscillations of electrons on the surface of nanoparticles [see also the article "Changing the Golden Being Purple"]. Many biologists believe that silver nanoparticles have high toxicity. Activity as antifungal agents and antibakteria good because a large surface area which makes it a good source of silver ions. This discovery explains the cycle of silver ions into nanoparticles in the environment and also explain the phenomenon of significant levels of silver nanoparticles in an old mining area that has not been used.