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首页> 外文期刊>Environmental toxicology and chemistry >RETENTION-RELEASE CHARACTERISTICS OF TRICLOCARBAN AND TRICLOSAN IN BIOSOLIDS, SOILS, AND BIOSOLIDS-AMENDED SOILS
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RETENTION-RELEASE CHARACTERISTICS OF TRICLOCARBAN AND TRICLOSAN IN BIOSOLIDS, SOILS, AND BIOSOLIDS-AMENDED SOILS

机译：生物体，土壤和经生物体改良的土壤中三碳和三糖的释放-释放特性

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摘要

Transport models that incorporate retention/release characteristics of organic compounds in soils and sediments typically assume that organic-carbon normalized partition coefficients (K_(OC)) apply to all solid matrices and that the partitioning process is completely reversible. Partition coefficients (K_d) (from which the K_(OC) was calculated), and retention/release characteristics of triclocarban (TCC) and triclosan (TCS) in biosolids, soils, and biosolids-amended soils were determined. Four soils of different physicochemical properties amended with biosolids at 10g/kg, together with unamended soils, and several biosolids were separately spiked with either [~(14) C]TCC or [~(14)C]TCS for the various determinations. The hysteresis coefficient values of the two compounds were consistently <1 in all three solid matrices, suggesting strong hysteresis. Multiple desorption steps (24 h each) over several days revealed incomplete desorption of the two compounds from all three solid matrices. The K_d values determined in biosolids (log K_d 3.34 ± 0.13 for TCC and 3.76 ± 0.39 for TCS) were greater than those determined in soils (log K_d 1.71 ± 0.09 for TCC and 2.25 ± 0.26 for TCS) and biosolids-amended soils (log K_d 1.90 ± 0.16 for TCC and 2.31 ± 0.19 for TCS), however, the AT_(OC)values of all three solid matrices were similar (log Koc of 3.82 ± 0.16 for TCC and 4.26 ± 0.31 for TCS). Thus, it was concluded that a single or a narrow range of K_(OC) values for TCC and TCS may be appropriate to describe retention of the compounds in soils and sediments. However, models that assume complete reversibility of the retention/release processes of the compounds in soils and sediments may not adequately describe the retention/release characteristics of the compounds in soils and sediments, especially when the chemicals are biosolids borne.
机译：结合了有机化合物在土壤和沉积物中的保留/释放特性的传输模型通常假定有机碳归一化分配系数（K_（OC））适用于所有固体基质，并且分配过程是完全可逆的。确定了分配系数（K_d）（据此计算了K_（OC））以及三氯卡班（TCC）和三氯生（TCS）在生物固体，土壤和经生物固体改良的土壤中的保留/释放特性。用10g / kg的生物固体修正了四种具有不同理化性质的土壤，以及未修正的土壤，并分别用[〜（14）C] TCC或[〜（14）C] TCS加标了几种生物固体，以进行各种测定。在所有三个固体基质中，两种化合物的磁滞系数值始终小于1，表明存在很强的磁滞现象。几天内的多个解吸步骤（每个24小时）显示两种化合物从所有三个固体基质中不完全解吸。在生物固体中测定的K_d值（TCC的log K_d为3.34±0.13，TCS为3.76±0.39）大于土壤（TCC的log K_d为1.71±0.09，TCS为2.25±0.26）和经生物固体改良的土壤（log K_d对于TCC为1.90±0.16，对于TCS为2.31±0.19），但是所有三个固体矩阵的AT_（OC）值都相似（TCC的log Koc为3.82±0.16，TCS的log Koc为4.26±0.31）。因此，得出的结论是，TCC和TCS的K_（OC）值的单个或狭窄范围可能适合描述化合物在土壤和沉积物中的保留。但是，假设化合物在土壤和沉积物中的保留/释放过程具有完全可逆性的模型可能无法充分描述化合物在土壤和沉积物中的保留/释放特性，尤其是当化学物质是生物固体时。

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  • 来源
    《Environmental toxicology and chemistry》 |2010年第9期|P.1925-1933|共9页
  • 作者

    Sampson Agyin-Birikorang; Matt Miller; George A. OConnor;

  • 作者单位

    Soil and Water Science Department, University of Florida, P.O. Box 110510, Gainesville, Florida 32611-0510, USA;

    rnSoil and Water Science Department, University of Florida, P.O. Box 110510, Gainesville, Florida 32611-0510, USA;

    rnSoil and Water Science Department, University of Florida, P.O. Box 110510, Gainesville, Florida 32611-0510, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    adsorption; desorption; partition coefficient; organic contaminants;

    机译：吸附解吸分配系数;有机污染物;

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