Green environmental effect

As time passes and our awareness of our global environment increases, the world s populace becomes acutely cognizant of the detrimental effects resulting from human endeavors. Incorporated into its assessment of the success of its chemical activities, an environmental barometer will demonstrate the commitment of chemistry to the environment. Green chemistry has as its aim to conduct its chemical activities in such a way as to minimize the generation of waste and to continually increase the beneficial environmental effects relative to previous practices. 

Chemical procedures that produce less waste or less hazardous waste are said to be green because they reduce harmful environmental effects. In chemical analyses with dithizone, you can substitute aqueous micelles (Box 26-1) for the organic phase (which has traditionally been chloroform, CHC13) to eliminate chlorinated solvent and the tedious extraction.2 For example, a solution containing 5.0 wt% of the micelle-forming surfactant Triton X-100 dissolves 8.3 X 10 5M dithizone at 25°C and pH < 7. The concentration of dithizone inside the micelles, which constitute a small fraction of the volume of solution, is much greater than 8.3 X 10 5M. Aqueous micellar solutions of dithizone can be used for the spectrophotometric analysis of metals such as Zn(II), Cd(Il), Hg(Il), Cu(ll), and Pb(II) with results comparable to those obtained with an organic solvent. 

Evaluating the Environmental Effects of Chemistry and Green Metrics... 

Green Fluorescent Protein is involved in the jellyfish, Aequorea Victoria [11, 92-95] and has very efficient emission property. It is now widely used as an excellent molecular marker in various fields of molecular biology [12, 96], There are theoretical studies investigating spectroscopy [97-104], potential surface of the excited state [105-107], and protein environmental effect [35, 101, 104, 108-110]. 

Greene JC (1996) A protocol for testing the potential environmental effect of solutions eluted from highway construction and repair Materials. Interim Report, NCHRP Project 25-9, Department of Civil, Construction, and Environmental Engineering, Oregon State University, Corvallis, OR... 

Renewable materials may be, in many cases, green and sustainable, but we should not make the mistake of assuming that this is always the case. The environmental effects of large scale use of biomass for production of materials and (especially) fuels can be quite detrimental this is an area requiring much more research. However, renewable feedstocks have the possibility of being sustainable, whereas non-renewable feedstocks can never, regardless of the circumstances, be sustainable. 

Ever since Rachel Carson drew attention to the adverse environmental effects of some pesticides in her book Silent Spring in 1962, there has been a growing concern and awareness of environmental issues. The environmental movement has grown very rapidly in recent years and this is evident from the establishment and rapid growth of the Green political parties in countries like Germany and the U.K. It is therefore appropriate to examine the position of the chemical industry with regard to the environment since a number of the problems have been laid at the former s doorstep. 

Ecological data have been collected for all the products in this project as well as for all process steps required (see Table 13.1). First a life-cycle inventory was established for aU relevant ecological inputs. In a second step a data assessment was carried out aggregating individual data into 10 environmental categories such as anthropogenic green house effect, eutrophication potential, and the like (Fig. 13.21). 

Increasing public awareness of the negative environmental effects of synthetic materials together with ever-stricter regulations, have boosted the growth of environmen-tally-friendly industries which produce "green" products [1]. 

Hot condensate to combination tower Green wax plugs system Environmental effects Venting to atmosphere... 

Because of their scale, the methods and practices of the chemical industry can have significant environmental effects. Fortunately, many of the qualities that characterize green chemistry are also the most desirable in economic terms. For example, two industrial chemicals-phenol and acetone-are produced in a process with high atom economy. 

---