Determination of sulfide in seawater

CHED 394

Nicole Salazar, Nicole.Salazar@fiu.edu1, Mariano Amicarelli, mamic001@fiu.edu1, Mily Galvez, gal2milyabel@1, and Mayra Exposito, exposito@fiu.edu2. (1) Chemistry Department, Florida International University, Biscayne Bay Campus, AC II Room 340, North Miami, FL 33181, (2) Department of Chemistry, Florida International University Biscayne Bay Campus, 3000 NE 151 Ave, AC II Room 340, North Miami, FL 33181
Ten standards were prepared within the range of 0 to 0.8 mg/L. These standards were measured using a LED at 644 nm, connected to a MicroLab Interface, and a calibration curve was obtained. Three different variables; distance from the shore, depth, and time of day were investigated. Samples were collected into special gas bottles to avoid the sulfide evaporation and were maintained cool during the collection process. Same day tests were conducted using the MicroLab software. The final step involved analyzing our findings using SPSS software. The regression analysis showed that the most significant variable (Sig << 0.05) was time. Distance and depth had little significance in the concentration of sulfide (Sig = 0.904 and 0.396 respectively), which fulfilled the criteria to remove these variables from the Mathematical Model. This experiment helped not only to understand the chemistry behind colorimetric methods, but also to connect environmental studies with predictions and statistical analysis.

 

Undergraduate Research Poster Session: Chemical Education
11:00 AM-1:00 PM, Monday, March 26, 2007 Hyatt Regency Chicago -- Riverside Center, Poster

Division of Chemical Education

The 233rd ACS National Meeting, Chicago, IL, March 25-29, 2007