ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Mining activities have deleterious impacts on the environment, such as the formation ofacid mine drainage (AMD), which occurs by the action of acidophilic bacteria in tailing deposits,generating diverse types of pollution. Hence it is important to examine the potential of mining wastematerial to produce acid solutions. Currently, the determination of the net potential of neutralizationconsiders the criteria of the Enviromental Protection Agency of the United States. It was concludedfrom experiments carried out with diverse samples from Mexico that the tailing samples studiedhave a high capacity of autoneutralization; although the drainage waters from the tailings and theaqueous extracts from tailing samples react acidic. It is obvious that this method of determination ofthe neutralization potential and the criteria accepted at the moment do not reflect the reality of theproblem. The sulfide analysis in aqueous solution consists of an indirect titration of the excessiodine in two phases (water/ CCl4) with a thiosulfate solution using starch as indicator. Since theiodine is insoluble in water, the equivalent point can be uncertain because part of the iodine can beretained by the starch. Thus, the XOCHIQUETZALLI method for the sulfide ion titration, has beendeveloped. It covers the chemical aspects of the titration procedure, such as the suitable reagentsand the maximum permissible concentrations, based on the law of Lambert and Beer. This titrationprocedure was successfully applied to determine dissolved sulfides extracted from tailing samples
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.20-21.226.pdf
Permalink