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A modified risk assessment to establish molybdenum standards for land application of biosolids

O'Connor, G A ; Brobst, R B ; Chaney, R L ; Kincaid, R L ; Mcdowell, L R ; Pierzynski, G M ; Rubin, A ; Van Riper, G G

Journal of environmental quality, 2001, Vol.30(5), pp.1490-507 [Peer Reviewed Journal]

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  • Title:
    A modified risk assessment to establish molybdenum standards for land application of biosolids
  • Author: O'Connor, G A ; Brobst, R B ; Chaney, R L ; Kincaid, R L ; Mcdowell, L R ; Pierzynski, G M ; Rubin, A ; Van Riper, G G
  • Description: The USEPA standards (40 CFR Part 503) for the use or disposal of sewage sludge (biosolids) derived risk-based numerical values for Mo for the biosolids --> land --> plant --> animal pathway (Pathway 6). Following legal challenge, most Mo numerical standards were withdrawn, pending additional field-generated data using modern biosolids (Mo concentrations <75 mg kg(-1) and a reassessment of this pathway. This paper presents a reevaluation of biosolids Mo data, refinement of the risk assessment algorithms, and a reassessment of Mo-induced hypocuprosis from land application of biosolids. Forage Mo uptake coefficients (UC) are derived from field studies, many of which used modern biosolids applied to numerous soil types, with varying soil pH values, and supporting various crops. Typical cattle diet scenarios are used to calculate a diet-weighted UC value that realistically represents forage Mo exposure to cattle. Recent biosolids use data are employed to estimate the fraction of animal forage...
  • Is Part Of: Journal of environmental quality, 2001, Vol.30(5), pp.1490-507
  • Identifier: ISSN: 0047-2425 ; PMID: 11577853 Version:1
  • Subjects: Molybdenum -- Analysis ; Sewage -- Chemistry ; Soil Pollutants -- Analysis
  • Language: English

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