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Mobility of Sludge‐borne 3,3′‐Dichlorobenzidine in Soil Columns
Author(s) -
Chung Duck Young,
Boyd Stephen A.
Publication year - 1987
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1987.00472425001600020010x
Subject(s) - humus , leachate , chemistry , environmental chemistry , leaching (pedology) , incubation , mineralization (soil science) , soil water , environmental science , soil science , biochemistry
Fate of the carcinogen 3,3′‐dichlorobenzidine (DCB) in sludge‐amended soil was evaluated. Carbon‐14‐1abeled DCB was used as a tracer to examine mineralization and mobility of DCB present in sludge. Dichlorobenzidine was shown to be very persistent in soil and sludge‐amended soil with < 2% of the added [ 14 C]DCB evolved as 14 CO 2 during a 182‐d incubation. Mobility of DCB was evaluated by using soil columns (5 by 45 cm) that were irrigated with 2.54 cm water d −1 for 84 d. The total 14 C recovered in leachate water was from 0.16 to 0.063% of the total 14 C added to the top 15 cm of the soil column at time zero. The strong binding of DCB to soil constituents rendered it highly immobile despite being placed in a sandy soil that was irrigated with large amounts of water. However, some finite, albeit small, quantity was apparently leached through the soil profile at a relatively constant rate. The immobilization of DCB presumably results from tbe formation of humus bound DCB residues and from its low water solubility.