Determination of semi-volatile priority pollutants in landfill leachates and sediments using microwave-assisted headspace solid-phase microextraction

Abstract

The present work was focused on the development of a simple method aimed at the determination of 12 polycyclic aromatic hydrocarbons (PAHs) and 15 polychlorinated biphenyls (PCBs) in landfill leachates and sediments by adapting a domestic microwave oven to perform microwave-assisted headspace solid-phase microextraction (MA-HS-SPME) followed by gas chromatographic separation and tandem mass spectrometric detection. Good linearity was observed within the concentration range studied; detection limits ranged from 0.1 ng/l to 7 ng/l for PCBs and from 5 ng/l to 926 ng/l for PAHs. Concerning precision, the relative standard deviations obtained were, on average for the leachate and sediment samples analysed, 18% for PCBs and 20% for PAHs. Average recovery values were 37% and 76% for PCBs, and 58% and 48% for PAHs, respectively, for the leachate and reference sediment studied. The method allows the determination of PAHs and PCBs in landfill leachates and sediments, avoiding clean-up steps and the consumption of organic solvents.

Determination of 26 polychlorinated biphenyls congeners in soil samples using microwave-assisted extraction with open vessel and gas chromatography

“…Figure 1). The modified parameters accorded with those given by previous studies, essentially based on the works of Ratola et al (14) and Herbert et al (15). The system operated as an open-vessel multimode extraction system.…”

“…Figure 4). Generally, in open-vessel microwave extraction which operates in multimode type, the temperature distribution is usually asymmetrical and can therefore influence recovery (15,24). An advantage of …”

Occurrence and removal of organic micropollutants in the treatment of landfill leachate by combined anaerobic-membrane bioreactor technology

“…The main component of PAHs in the raw leachate (L1) was acenaphthylene, at a concentration of 595.2 ng/L. Contamination of PAH in this leachate was not very high, as the total amounts of PAHs have been reported in landfill leachates at the concentrations up to 114,273 ng/L (Herbert et al, 2006). 4-Nonylphenol was detected during all the treatment processes at concentrations of 92-482 ng/L.…”

“…E-mail: wangzj@rcees.ac.cn. Castillo and Barcelo, 2001;Grøn et al, 2000;Herbert et al, 2006;Nascimento Filho et al, 2003;Noma et al, 2001;Ozkaya, 2005;Urase and Miyashita, 2003), which are summarized in Table 1. Organic micropollutants contribute little to the level of total organic constituents, such as chemical oxygen demand (COD) and total organic carbon (TOC).…”

Heavy metal bioaccumulation in <i>Callinectes amnicola</i> and <i>Farfantepenaeus notialis</i> from three selected tropical water bodies in Lagos, Nigeria.

“…At the same time, significant amounts of municipal and agricultural wastes are discharged into the environment. These pollutants enter atmospheric and hydrological circulation and are finally deposited on river beds, swamps and in the marine environment, thus leading to a sink of contamination (Herbert et al, 2006). Aquatic invertebrates take up and accumulate trace heavy metals which have the potential to cause toxic effects.…”