b'Analysis of Sulfate Content in Water SamplesAnna L. Jones, Kalen Allen, Alexandria Barker, Kahleel Guerrier, Kwajalen Hall, Yeong Hun Jeong, Haley Lewis, Alexa Luna, Alentra Mitchell, Andrew Puryear, and Hope SmithSponsor: Dr. de la GarzaWater quality of lakes and rivers is important for sustaining ecosystems and protection of public health since both surface waters and groundwater might be used to obtain drinking water. Sulfate may occur naturally in groundwater from the dissolution of sulfate containing minerals in soil and rocks. At high levels, sulfate can give water a bitter or medicinal taste and can have laxative effects. To be safe, water level lower than 500 mg/L should be used to drink (specially for infants). High sulfate content may also contribute corrosion of pipes used in plumbing. Samples of water from ponds and streams around Valdosta, GA were analyzed for sulfate content using a conductometric titration method with standardized solutions of barium chloride. The conductance meter was recorded at intervals during the precipitation titration of BaSO4(s) and a graphical method was used to determine the endpoint of the titration. Analysis of Iron Content in Water SamplesHaley Lewis, Alexa Luna, Kalen Allen,Alexandria Barker, Yeong Hun Jeong, Anna L Jones,Alentra Mitchell, Andrew Puryear, and Hope SmithSponsor: Dr. de la GarzaWater quality of lakes and rivers is important for sustaining ecosystems and protection of public health since both surface waters and groundwater might be used to obtain drinking water. Iron is one of the earths most plentiful elements, rainwater infiltrates the soil and dissolves iron, causing to seep into aquifers that serve as sources of groundwater for wells. Iron is rarely found at concentrations greater than 10 mg/L (or 10 ppm), however as little as 0.3 mg/L can cause water to turn a reddish-brown color. Samples of water from ponds and streams around Valdosta, GA were analyzed for iron content using the 1,10-Phenanthroline method. In this procedure, standard solutions of Fe2+ ions and unknown iron content water samples were prepared by using hydroxylamine chloride as reducing agent, ammonium acetate buffer solution, and 1,10-phenanthroline (Phe) ligand to form an orange-red iron(II)- (Phe)3 complex. The absorbance spectra of the solutions were recorded using a UV-VIS spectrophotometer and iron content in water samples was determined using data from the calibration curve. 28'