Identification of Organic Compounds in a Municipal Landfill Leachate by Gas Chromatography Coupled With Mass Spectrometry

Abstract

The organic compounds present in leachate can contaminate soil, superficial and underground water, and the majority is considered harmful to the environment and human health. The objective of this study was to identify organic compounds present in landfill leachate located in Maringá-PR by gas chromatography coupled to mass spectrometry (GC-MS). The raw leachate was characterized by measurements of pH, Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOQ), Dissolved Organic Carbon (DOC), apparent and true colors, turbidity and absorbance at 254 nm. The extraction of organic compounds in leachate was carried out by liquid-liquid extraction (LLE) with ethyl acetate and dichloromethane solvents, while varying the pH and ionic strength. The analysis of the leachate by GC-MS showed the presence of compounds considered to have toxic effects on the environment and human health, such as pesticides and phenolic compounds. Several compounds containing oxygenated groups such as carboxylic acids and alcohols were also identified, indicating that it was highly probable that the decomposition of waste in the landfill was in the acidogenic phase. ]]>

Supercritical water oxidation treatment of humic acid as a model organic compound of landfill leachate

“…Although results for all combinations were close, the most severe temperature (600°C) and highest reaction time (60 seconds) were chosen to conduct the landfill leachate treatment, for which the supercritical pressure remained constant (22.5 MPa). These conditions were chosen because the leachate is a more complex wastewater than the synthetized HA model solution since it is composed of several other refractory organic compounds as illustrated in the works of Brow and Donnelly and Rigobello et al In addition, as seen in the studies of Weijin and Xuejun, Wang et al, Civan et al, and Ferreira‐Pinto et al, landfill leachates treated with ScWO provide better decontamination of wastewater under the most severe conditions, that is, at the highest operating temperature and reactional time.…”

Characterization of the Primary Sludge from Pharmaceutical Industry Effluents and Final Disposition

“…According to Turki et al [16], cited by Rigobello et al [17], the organic compounds that are present in the residues can leach into groundwater and surface water and, because of the difficulty of their removal by conventional methods such as coagulation, sedimentation, flocculation, and filtration, they can be found in water intended for human consumption. These same authors, Turki et al [16], studying landfill leachate samples before and after treatment with Fenton reagent, identified aromatic acids (1,2-diphenylcyclobutane, 4-phenyl cyclohexane, and 1,2-benzenedicarboxylic acid), phenolic compounds (2,4-bisphenol, 4-methyl phenol), aliphatic acid and ester (bis(2-methoxyethyl)ester), phthalate ester -alcohols (2-chlorocyclohexanol and cholestanol), and polyaromatic hydrocarbons (anthracene and naphthalene).…”

Phytochemical composition, antifungal activity, in vitro and in vivo toxicity of Syzygium cumini (L.) Skeels leaves extract

“…The plant material was extracted as previously described (Rigobello et al, 2015), with modifications. Briefly, Sc leaves were submitted to liquid-liquid extraction and solid-phase extraction.…”

“…The chemical compounds were characterized by comparison between the mass spectra obtained in the GC-MS analysis and those found in the NIST library (National Institute of Standards and Technology) (The NIST Mass Spectral Search Program for the NIST/EPA/NIH Mass Spectral library version 2.0 g. build May 19, 2011) as described (Rigobello et al, 2015), with modifications. The inocula were prepared according to the protocol M27-A3 for yeasts (CLSI, 2008), with modifications, using Sabouraud Dextrose broth (Difco, Detroit, USA) and standardized in a spectrophotometer (Model GT 7220 BioPet Technologies, Monte Alto, Brazil) at 530 nm (absorbance values between 0.08-0.1) and was successively diluted to a final concentration of 2.5x10 3 CFU/mL for microdilution assays.…”