title: Feasibility of using near-infrared spectroscopy for rapid quantification of 17β-estradiol sorption coefficients in soil.
abstract: Livestock manure contains natural steroid hormones, with the most potent being 17β-estradiol. The transport of steroid hormones from agricultural fields to adjacent water bodies can result in 17β-estradiol environmental contamination impacting aquatic organisms. Sorption coefficients are useful input into models that estimate risk of water contamination. The feasibility of applying near-infrared spectroscopy (NIRS) for determining sorption coefficients of 17β-estradiol in soil was investigated for two irregular undulating to hummocky terrain landscapes in Manitoba and Saskatchewan, Canada. A total of 609 soil samples in 140 soil profiles were collected from several horizons to a depth of 1 m. Air-dried and sieved (2 mm) soil samples were analyzed for soil organic carbon (SOC), soil pH, and soil texture. Sorption coefficients of 17β-estradiol were determined by a batch equilibrium process. Spectral data were collected from soil samples (25 g) using two instruments, the 45VISNIR Zeiss Corona (wavelength range 700-1690 nm) and the Foss NIRSystems 6500 (wavelength range 1100-2500 nm). Regardless of the site and instrument, the predictive models were excellent for both SOC and 17β-estradiol sorption coefficients. The data thus generated can be used as input parameters in fate models for efficient risk assessments and decision-making programs for environmental safety where soils are at risk of receiving inputs of 17β-estradiol. Calibration results for soil pH were also adequate with Corona outperforming the Foss instrument. Soil texture predictions were relatively unsuccessful regardless of the instrument and site.
authors.affiliation: Department of Soil Science, University of Manitoba , Winnipeg, Manitoba, R3T 2N2, Canada.
authors.forename: Baljeet
authors.initials: B
authors.lastname: Singh
authors.forename: Diane F
authors.initials: DF
authors.lastname: Malley
authors.forename: Annemieke
authors.initials: A
authors.lastname: Farenhorst
authors.forename: Phil
authors.initials: P
authors.lastname: Williams
mesh_terms: D000327:Adsorption; D002170:Canada; D004958:Estradiol / Q000032:analysis* / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D012306:Risk; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis; D019265:Spectroscopy, Near-Infrared; D014876:Water Pollution
chemical_list: D012987:Soil; D012989:Soil Pollutants; D004958:Estradiol