No abstract

No abstract

Johnson Pond occupies a small, deep, solution basin (A = 2.2 ha, zmax = 17.5 m) in north Florida. This warm, monomictic lake gains and loses 5,945 cal cm−2 annually. Dissolved color and algal turbidity limit light and heat penetration, causing steep gradients in temperature, oxygen, dissolved inorganic C, and remobilized sedimentary P during stratification from March through November. Water below 5 m is cool (<14°C) and anoxic throughout the year. Weak chemical gradients can persist in the water column during homothermy. The lake is ineffectively mixed because of morphometry, wind sheltering by trees, and the brevity of homothermy. An unusual consequence of winter mixing is very low oxygen concentrations in surface waters (< 1 mg liter−1). Surface‐water oxygen is diluted by upward mixing of deeper anoxic waters, and O2 is consumed by BOD and reduced Fe and S. Deoxygenation at mixis occurs in several African lakes, but is unreported in warm, monomictic lakes of North America.

This project involved developing a method to remediate large quantities of aqueous waste from a general chemistry laboratory experiment. Aqueous Ni(II) waste from a general chemistry laboratory experiment was converted into solid nickel hydroxide hydrate with a substantial decrease in waste volume. The remediation method was developed for a two-fold purpose: to provide procedures for removing nickel from an aqueous mixture and to serve as a template for the development of waste treatment experiments for pedagogical purposes.