Landfill leachate (LL) is a complex wastewater and an important potential source of environmental contamination. LL can contain high concentrations of ammonia, metals, other inorganic species, and dissolved organic carbon; however, bulk composition of dissolved LL organic matter (LLOM) is poorly understood. A better understanding of LLOM composition will inform treatment development and improve LL pollution tracing. In this study, we addressed this need for compositional and treatment information by characterizing LL from an active bioreactor municipal solid waste (MSW) landfill as well as from a closed MSW landfill. Through non-targeted ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) we were able to assign chemical formulas to thousands of singly charged molecular ions and compare samples to natural dissolved organic matter (DOM). LLOM was differentiated by a higher presence of sulfur-, nitrogen-, and chlorine-, particularly nitrogen–sulfur-, containing formulas. The abundance of chlorine-containing molecular formulas supports the existence of a non-volatile organochlorine component in MSW LL. We performed tandem MS (MS-MS) analyses to tentatively identify the presence of the flame retardant, chlorendic acid, and likely related compounds. Additionally, we measured contaminants of emerging concern (CECs) and other chemical parameters to further characterize LLs and found evidence suggesting a significant percent of Fe may be bound in Fe–organic complexes.

中文翻译：

---

使用超高分辨率质谱法表征垃圾渗滤液分子组成

垃圾渗滤液是一种复杂的废水，是环境污染的重要潜在来源。LL可能包含高浓度的氨，金属，其他无机物和溶解的有机碳；但是，对溶解的LL有机物（LLOM）的整体组成了解得很少。更好地了解LLOM成分将为治疗的发展提供信息并改善LL污染的追踪。在这项研究中，我们通过表征活性生物反应器城市生活垃圾（MSW）垃圾填埋场和封闭MSW垃圾填埋场的LL来满足对组成和处理信息的需求。通过非目标超高分辨率傅里叶变换离子回旋共振质谱（FT-ICR-MS），我们能够为数千个带正电荷的分子离子分配化学式，并将样品与天然溶解有机物（DOM）进行比较。LLOM的区别在于更高的含硫，氮和氯的配方，尤其是含氮硫的配方。大量的含氯分子式支持MSW LL中存在非挥发性有机氯成分。我们进行了串联质谱（MS-MS）分析，以初步确定阻燃剂，氯丹酸和可能的相关化合物的存在。此外，