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Chem 287_Chapter 13

Chem 287_Chapter 13 - 287 Chapter 13 EDTA Titrations A...

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287 Chemistry Salin Ch 13 Page 1 287 Chapter 13: EDTA Titrations A molecule extensively used in biochemistry Very important environmentally as it carries metal ions…often to unwanted places. An important “chelator” (Greek: “claw”) Can be used for toxic metal extraction Analytically Very used for metals Can do essentially all Looks complex Actually simple….reacts 1:1 with metals Very pH sensitive 287 Chemistry Salin Ch 13 Page 2 Wikipedia In 1999, the annual consumption of EDTA was equivalent to about 35,000 tons in Europe and 50,000 tons in the US. The most important uses are: Industrial cleaning complexation of Ca 2+ and Mg 2+ ions, binding of heavy metals . Detergents complexation of Ca 2+ and Mg 2+ (reduction of water hardness). Photography use of Fe(III)EDTA as oxidizing agent. Pulp and paper industry complexation of heavy metals during chlorine-free bleaching, stabilization of hydrogen peroxide. Textile industry complexation of heavy metals, bleach stabilizer. Agrochemicals Fe, Zn and Cu fertilizer, especially in calcareous soils. Hydroponics iron-EDTA is used to solubilize iron in nutrient solutions
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