287 ChemistrySalin Ch 13 Page 1287 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 sensitive287 ChemistrySalin Ch 13 Page 2WikipediaIn 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 complexationof Ca2+and Mg2+ions, binding of heavy metals. Detergentscomplexation of Ca2+ and Mg2+(reduction of water hardness). Photographyuse of Fe(III)EDTA as oxidizing agent. Pulp and paperindustry complexation of heavy metals during chlorine-free bleaching, stabilization of hydrogen peroxide. Textileindustry complexation of heavy metals, bleach stabilizer. AgrochemicalsFe, Zn and Cu fertilizer, especially in calcareous soils. Hydroponicsiron-EDTA is used to solubilize iron in nutrient solutions
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