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Selenium Stable Isotope Ratios in California Agricultural Drainage Water Management Systems

^a U.S. Geological Survey, Water Resources Division, 345 Middlefield Road, Mail Stop 480, Menlo Park, CA 94025
^b Dep. of Geology, 245 Natural History Bldg., 1301 W. Green St., Univ. of Illinois, Urbana, IL 61301
^c Dep. LAWR, One Shield Avenue, Univ. of California, Davis, CA 95616

View larger version (32K): [in a new window]   Fig. 1. Approximate locations of sampling sites in the western San Joaquin Valley, California. IFDMS, integrated on-farm drainage management system; LH, Lost Hills; TLDD, Tulare Lake Drainage District.

View larger version (57K): [in a new window]   Fig. 2. Integrated on-farm drainage management system (IFDMS) and Tulare Lake Drainage District (TLDD) flow-through wetland generalized designs and sampling locations [after Tanji (1999) and Gao et al. (2000)].

View larger version (30K): [in a new window]   Fig. 3. Total Se concentrations and 80/76Se values for macrophytes collected from various cells of the Tulare Lake Drainage District (TLDD) flow-through wetlands. Saltmarsh bulrush (SB, Cell 1), baltic rush (BR, Cell 2), rabbitsfoot grass (RG, Cell 5), saltgrass (SG, Cell 6), widgeon grass (WG, Cell 9), or cattails (Ct, Cell 10).

View larger version (35K): [in a new window]   Fig. 4. Selenium speciation and 80/76Se values for water collected from Cell 1 and Cell 3 of Tulare Lake Drainage District (TLDD) flow-through wetlands.

View larger version (40K): [in a new window]   Fig. 5. Selenium concentrations in sequential extracts of cored sediments from Cells 1, 3, and 5 of Tulare Lake Drainage District (TLDD) flow-through wetlands. Concentrations of extractants are given in text. Selenium in all 1.0 M acetate extracts was <0.013 mg kg-1.

View larger version (25K): [in a new window]   Fig. 6. The 80/76Se values for sequential extracts of cored sediments from Cells 1, 3, and 5 of Tulare Lake Drainage District (TLDD) flow-through wetlands. Total Se for 5C, 0 to 1.5 cm = 3.0, while 1.5 to 5.0 cm = 2.5.

View larger version (35K): [in a new window]   Fig. 7. Selenium cycling in the Tulare Lake Drainage District (TLDD) flow-through wetlands. Major loss pathways as suggested by comparison of 80/76Se values are indicated by heavy arrows, while minor pathways are indicated by light arrows. DMSe, dimethylselenide; DMDSe, dimethyldiselenide; Org-Se, organic selenium.