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Project 2: Gutzeit Method for Determination of As in Soils

Allowable Levels of Arsenic in Soils. The Massachusetts DEP, www.mass.gov/dep/service/regulations/proposed/aisfindr.pdf, (accessed August, 2010). Massachusetts: The allowable level is 20 mg kg-1 (ppm) in soil . Key Issues Surrounding Arsenic in Soil . . Sources:Naturally OccurringMining Wood Treatments for PreservationBactericides, Fungicides, Pesticides and InsecticidesAreas of Concern:Arsenic in soil is mobile into water and plant sources. Is there bioaccumulation in rice?9446

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Project 2: Gutzeit Method for Determination of As in Soils

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    1. Project 2: Gutzeit Method for Determination of As in Soils

    3. Key Issues Surrounding Arsenic in Soil

    4. The Soil, Rice and Water Connection Average rice consumption between 400 and 650 g/day by typical adults in the arsenic-affected areas of Bangladesh, the intake of arsenic through rice stood at 0.20-0.35 mg/day. Daily water consumption of 4 L drinking water, arsenic intake through drinking water stands at 0.2 mg/day. Background arsenic concentration ranges from 2.35 to 0.18 mg kg-1 (ppm) in dry soil and from 50.6 to 0.03 mg kg-1 (ppm) in wetlands.

    6. Plot of Blue Pixel Count Versus Concentration of Arsenic at Varied Mass Blue pixel count versus concentration of arsenic in mg kg-1 for five mass values at 1-20 reacted 20 minutes, 0.1 g (diamond), 0.5 g (square), 1 g (triangle), 5 g (x with a line), 10 g (x).

    7. Plot of Blue Pixel Count Versus Concentration of Arsenic at 0.5 g soil and a Large Range of Concentrations at Different Times Plot of concentration of blue pixel value versus arsenic for 0.1 grams mass soil at 1-1000 mg kg-1 for four time periods; 1 hour(diamond), 45 min. (square), 30 min. (triangle), 20 min.(x).

    8. Plot of Blue Pixel Count Versus Concentration of Arsenic at Varied Soil Mass and Time Plot of concentration of arsenic in mg kg-1 versus average blue values for 0.05 g mass soil at 1 to 1000 mg kg-1for four time periods, 20 min.(x), 30 min. (triangle), 45 min. (square), 1 hour (diamond)

    9. Extraction of Arsenic from Soils with Different Solvent Plot of concentration of arsenic in mg kg-1 versus average blue values for 0.1 g mass soil at 20 to 1000 mg kg-1for three extracting solvents, sulfamic acid 1 M (blue diamond), phosphoric acid 1 M (red square), phosphoric acid 1 M at 24 hours (green triangles).

    10. Future Work Soils: experiment with a variety of soils containing wide ranges of particle distribution. Solvents: use extraction procedures to determine if extraction enhances sensitivity. Time: continue to investigate the relationship between time of exposure and ability to extract the metals from the soil matrix. Kits: experiment with different manufacturer’s kits.

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