Selenium depth profiles

TokunagaTK, LiptonDS, Benson SM, Yee AW, Oldfather JM, Duckar EC, Johannis PW, HalvorsenKE (1991) Soil selenium fractionation, depth profiles and time trends in a vegetated site at Kesterson Reservoir. Water Air Soil Pollut 57 31-41... 

Figure 4 Depth profiles for concentrations of total selenium and different chemical forms of selenium (selenate, selenite, and organic selenium compounds) in filtered seawater samples from the eastern tropical North Pacific Ocean (18° N, 108° W Oct.-Nov. 1981). Data are from Cutter GA and Bruland KW (1984) The marine biogeochemistry of selenium A reevaluation. Limnology and Oceanography 29 1179-1192.

The biological pump influences, to varying degrees, the distribution of many elements in seawater besides carbon, nitrogen, phosphorus, and silicon. Barium, cadmium, germanium, zinc, nickel, iron, selenium, yttrium, and many of the REEs show depth distributions that very closely resemble profiles of the major nutrients. Additionally, beryllium, scandium, titanium, copper, zirconium, and radium have profiles where concentrations increase with depth, although the correspondence of these profiles with nutrient profiles is not as tight (Nozaki, 1997). 

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