lab .docx - Domestic Use Water Analysis Lab Objectives...

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Domestic Use Water Analysis Lab Objectives Increase awareness of the problems associated with water pollution. Increase awareness of the importance of domestic water treatment. Demonstrate the methods for testing and treating water. Introduction The purpose of the Domestic Use Water Analysis is to understand the importance of water treatment for domestic use. In South Florida, the Biscayne Aquifer is the primary source of water for domestic and industrial use. In order for domestic water to be considered safe for human use, it must meet certain standards set by local, State, and Federal governments before the water is delivered to our homes. Routine laboratory testing for heavy metals, organic pesticides, volatile organic compounds, and pathogens that can potentially penetrate groundwater systems is critical for the health and welfare of citizens. Concentrations of hardness ions, such as calcium (Ca 2+ ) and magnesium (Mg 2+ ), as well as dissolved solids, must also be significantly reduced for domestic use. The following laboratory experiments will illustrate a few of the many testing methods used to monitor concentrations of various substances. Since this laboratory focuses on water treatment for domestic use, qualitative and quantitative experiments will be performed for dissolved solids, chloride ions, hardness ions and tannins. Water Analysis Experiments Experiment A. Tannin Concentration A primary concern in the disinfecting of water using chlorine is the formation of disinfecting by-products such as chlorinated organic compounds, that are known carcinogens like trihalomethanes. In water systems, potentially carcinogenic trihalomethanes form when chlorine reacts with dissolved organic carbon (DOC), which is essentially from decayed vegetation and other organic material. Reducing the amount of DOC, like naturally occurring humic acids and tannins, prevents the formation of these suspected carcinogens in the presence of chlorine.

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