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THE EFFECT OF AGING ON PYRENE TRANSFORMATION IN SEDIMENTS

机译：老化对沉积物中P转化的影响

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摘要

The effect of aging on pyrene transformation and pyrene association with fractions of the sedimentary organic matrix (S_dOM) was evaluated using [4,9-~(13)C_2]pyrene. Sediments were collected from a site of previous petroleum hydrocarbon contamination (New Orleans, LA, USA). Aged sediments were autoclaved for 1 h, amended with pyrene, and then stored in the dark in a 0.05% NaN, solution for 120 d. Both aged and nonaged sediments were incubated in aerated microcosms for 120 d. Microcosms were acidified to collect evolved carbon dioxide (CO_2); sediments were fractionated and lipid extracted to quantify pyrene in S_dOM fractions. Cross-polarization magic angle spinning ~(13)C-nuclear magnetic resonance (CPMAS ~(13)C-NMR) spectra indicated that synthetic aging techniques did alter S_dOM structure to some degree, but these changes did not affect S_dOM affinity for pyrene. Aging delayed pyrene mineralization and increased pyrene concentrations extracted from bulk sediment and humic fractions. Aging also reduced the toxicity of sediment humin. Pyrene-4,5-dione and pyrene cis-4,5-dihydrodiol were identified in extracts of aged sediments by ~(13)C-NMR and gas chromatography mass spectrometry, respectively.
机译：使用[4,9-〜（13）C_2] evaluated评估了老化对pyr转化和pyr与沉积有机基质（S_dOM）缔合的影响。从以前的石油碳氢化合物污染的地点（美国路易斯安那州新奥尔良）收集沉积物。将老化的沉积物高压灭菌1小时，用pyr进行修正，然后在黑暗中的0.05％NaN溶液中保存120天。老化的和未老化的沉积物都在充气的缩影中孵育120天。微观世界被酸化以收集放出的二氧化碳（CO_2）；分离沉淀物并提取脂质以定量S_dOM馏分中的pyr。交叉极化魔角旋转〜（13）C-核磁共振（CPMAS〜（13）C-NMR）谱表明，合成时效技术确实在一定程度上改变了S_dOM结构，但这些变化并未影响S_dOM对pyr的亲和力。老化会延迟pyr的矿化作用，并增加从大量沉积物和腐殖质馏分中提取的pyr的浓度。衰老还降低了沉积物腐殖质的毒性。通过〜（13）C-NMR和气相色谱质谱法分别鉴定了老化沉淀物中的-4,5-二酮和pyr顺-4,5-二氢二醇。

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