WATER SAMPLE 1131 - 1 Introduction The water plays the most...

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1 Introduction The water plays the most crucial roles in all aspects. Especially, high quality of water is essential for survival. However, nearly all water except drinking water contains minerals rather two hydrogens and one oxygen. The quality of water is evaluated by its biological and chemical components. Water quality can be evaluated by presence of magnesium and calcium – hardness . Among various components of water, divalent cations magnesium and calcium are the most common source. With lower amount of calcium and magnesium, the water is said to be soft while the water is said to be hard with higher concentration of calcium and magnesium. Unit of hardness is ppm – part per millions; concentrations of divalent cations are reported as ppm. For standardization of hardness measurement, 1 ppm equals to 1 g of CaCO 3 . Mass of the solute should me must be known to convert concentration into ppm 1 . Measuring hardness is important for quality check in aspects of daily lives and fish culture. Water hardness impacts on pH measurements and its stability, and it causes toxicity factors, including fish diseases. Quality check for fish cultures is extremely crucial for sustain optimal environment 2 . Scientists and researches continue to have a stormy debate whether water hardness causes human diseases such as cardiovascular diseases or Alzheimer’s disease. One scientist argues that drinking hard water influences mortality, especially for cardiovascular disease 3 . Also, hardness can impact on taste of drinking water; softer water tastes saltier, and it is appropriate for drinking water. For daily usage of water, harder water is less desirable since it
2 requires more soap and cleansing 4 . In industry area, hard water causes issues such as scale formation, and it costs tremendous money to get rid of deposits 5 . EDTA titration and atomic absorption spectrophotometry (AA) are the most typical

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