Goals: Measure the mean velocity in the laboratory flume using two different methods, and determine whether these estimates agree within the uncertainty.

Objective: Use a tracer study to estimate the dispersion coefficient, pore velocity and porosity of a sediment column. 

You will estimate the rate of exchange between a water body (the flume) and the overlying air for two volatile compounds, molecular oxygen and chloroform. You will use an oxygen electrode to measure the changing concentration of oxygen, and gas chromatography (GC) to observe the concentration of chloroform.

Lab on CO₂ and Climate Change for Experimental Atmospheric Chemistry.

Using the given LED (3.6V, 20mA) and 9V battery provided in class, a resistor of your choosing, and found materials, construct a lantern. The lantern should be able to turn on and off.