Anyanwu Ihuoma N, Ikpikpini Ojerime C, Semple Kirk T
Lancaster Environment Centre, Lancaster University, Lancaster, United Kingdom; Department of Biological Sciences, Federal University Ndufu-Alike Ikwo, P.M.B 1010 Abakaliki, Ebonyi State, Nigeria.
Lancaster Environment Centre, Lancaster University, Lancaster, United Kingdom.
Ecotoxicol Environ Saf. 2018 Jan;147:594-601. doi: 10.1016/j.ecoenv.2017.09.019. Epub 2017 Oct 10.
When aromatic hydrocarbons are present in contaminated soils, they often occur in mixtures. The impact of four different (3-ring) nitrogen-containing polycyclic aromatic hydrocarbons (N-PAHs) on C-phenanthrene and C-benzo[a]pyrene (B[a]P) mineralisation in soil was investigated over a 90 d incubation period. The results revealed that both C-phenanthrene and C-benzo[a]pyrene showed no significant mineralisation in soils amended with 10mgkg and 100mgkg N-PAHs (p>0.05). However, increases in lag-phases and decreases in the rates and extents of mineralisation were observed, over time. Among the N-PAHs, benzo[h]quinoline impacted C-phenanthrene mineralisation with extended and diauxic lag phases. Furthermore,C-B[a]P and C-benzo[a]pyrene-nitrogen-containing polycyclic aromatic hydrocarbons (C-B[a]P-N-PAHs) amended soils showed extensive lag phases (> 21 d); with some C-B[a]P-N-PAH mineralisation recording <1% in both concentrations (10mgkg and 100mgkg ), over time. This study suggests that the presence of N-PAHs in contaminated soil may impact the microbial degradation of polycyclic aromatic hydrocarbons (PAHs) and the impact was most likely the result of limited success in achieving absolute biodegradation of some PAHs in soil.
当芳香烃存在于受污染土壤中时，它们通常以混合物形式出现。在90天的培养期内，研究了四种不同的（三环）含氮多环芳烃（N-PAHs）对土壤中C-菲和C-苯并[a]芘（B[a]P）矿化的影响。结果表明，在添加10mgkg和100mgkg N-PAHs的土壤中，C-菲和C-苯并[a]芘均未表现出显著的矿化作用（p>0.05）。然而，随着时间的推移，观察到滞后期增加，矿化速率和程度降低。在N-PAHs中，苯并[h]喹啉通过延长和双相滞后期影响C-菲的矿化。此外，添加C-B[a]P和含氮多环芳烃的C-苯并[a]芘（C-B[a]P-N-PAHs）的土壤表现出较长的滞后期（>21天）；随着时间的推移，两种浓度（10mgkg和100mgkg）下的一些C-B[a]P-N-PAH矿化率均<1%。这项研究表明，受污染土壤中N-PAHs的存在可能会影响多环芳烃（PAHs）的微生物降解，这种影响很可能是土壤中某些PAHs无法完全生物降解的结果。
