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Biosolids inhibit bioavailability and plant uptake of triclosan and triclocarban

Journal Article · · Water Research
 [1];  [2];  [3];  [2];  [2]
  1. Univ. of California, Riverside, CA (United States). Dept. of Environmental Sciences; Zhejiang Univ., Hangzhou (China). Inst. of Nuclear Agricultural Sciences
  2. Univ. of California, Riverside, CA (United States). Dept. of Environmental Sciences
  3. Zhejiang Univ., Hangzhou (China). Inst. of Nuclear Agricultural Sciences
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Biosolids from wastewater treatment are primarily disposed of via land applications, where numerous pharmaceuticals and personal care products (PPCPs) may contaminate food crops and pose a human exposure risk. Biosolids are rich in organic carbon and addition of biosolids can increase the sorption of certain PPCPs in soil, decreasing their bioavailability. This work tested the hypothesis that the relative plant uptake of PPCPs decreases with increasing biosolids amendment. Accumulation of triclosan and triclocarban was measured in roots of radish and carrot grown in soils with or without biosolids. Addition of biosolids significantly prolonged the persistence of triclosan in soil. When expressed in bioaccumulation factor (BCF), accumulation of triclosan drastically decreased in biosolids-amended soils, while the effect was limited for triclocarban. Compared to the unamended soil, amending biosolids at 2% (w/w) decreased BCF of triclosan in the edible tissues of radish and carrot by 85.4 and 89.3%, respectively. Measurement using a thin-film passive sampler provided direct evidence showing that the availability of triclosan greatly decreased in biosolids-amended soils. Partial correlation analysis using data from this and published studies validated that biosolids decreased plant uptake primarily by increasing soil organic carbon content and subsequently sorption. Therefore, contamination of food crops by biosolids-borne contaminants does not linearly depend on biosolids use rates. This finding bears significant implications in the overall risk evaluation of biosolids-borne contaminants.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); USEPA
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1474970
Journal Information:
Water Research, Journal Name: Water Research Journal Issue: C Vol. 102; ISSN 0043-1354
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (6)

Table 1(p. 3)table Table 1
Table 2(p. 4)table Table 2
Fig. 1(p. 6)figure Fig. 1
Fig. 2(p. 7)figure Fig. 2
Fig. 3(p. 7)figure Fig. 3
Fig. 4(p. 8)figure Fig. 4

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Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
54 ENVIRONMENTAL SCIENCES
Bioavailability
Biosolids
PPCPs
Plant uptake
Triclocarban
Triclosan