Depth (m) NH4 0 0.1 5 0.1 10 0.1 20 0.1 30 0.1 40 0.76393338 50 1.82612477 60 2.52250137 65 2.78351235 70 3.38585206 75 3.4212787 80 4.55597314 85 5.00462375