The variables I will need to control is where I do the test as in location with soil and water. Water may not think as being as vital if the river was flowing but I am keeping it in the same location as to in places in the first test the water was stagnate and it may pass through chemicals along the way which may very well change the results. The soil i have chosen for each is in the same place as the water was taken from and always around a meter from the water sources (exception being the mangroves where I had to go further in as I wanted a true mangrove soil analysis.)
Time will also be another factor for me as tides will affect the last two of my results. So I am going at 5pm for each test.
What I tried to change was weather I was lucky enough to go after rain which changed the water from being stagnate in places to a continuous flowing creek.
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