Abstract
Phthalate esters (PEs) are by far the most produced and extensively used synthetic organic chemicals with notable applications in many industrial products such as vinyl upholstery, adhesives, food containers, packaging materials, printing inks, adhesives, cosmetics, paints, pharmaceuticals munitions, and insecticides among other. PEs have long been recognised as ubiquitous organic pollutants of prime environmental concern, with urbanisation amongst the main cause and source of these compounds. Due to their notoriety, these compounds are known to pose devastating effects to living organisms including humans. The presence of PEs and their metabolites in the aquatic ecosystems is of concern primarily due to their endocrine disrupting and carcinogenicity properties. Several research studies have reported prevalence, exposure pathways, toxicity, and impacts of PEs in aquatic ecosystems and humans. Their principal routes of exposure could be direct or indirect, of which the direct route include contact, eating, and drinking contaminated foods, and the indirect route constitute aerosols, leaching and other forms of environmental contamination. PEs find way into water systems through means such as effluent discharges, urban and agricultural land runoff, leaching from waste dumps and other diffuse sources. High-end instrumentation and improved methodologies on the other hand have resulted in increased ability to measure trace levels (μg/L) of PEs and their metabolites in different matrices and ecological compartments of water or aquatic ecosystems such as lakes, oceans, rivers, sediments, wetlands and drinking water samples. In light of the above, this article provides an informed and focused information on the prevalence of phthalate esters in aquatic systems and related effects on living organisms and humans. Furthermore, techniques that have enabled the extraction and analysis of these PEs in aquatic samples are also explained. Future research outlooks and needs are also highlighted in this manuscript. This information will be used to better understand their temporal and spatial distributions in the aquatic systems and aid in devising prudent means to curtail their ecological footprints.
Highlights
Phthalate esters (PEs) belong to a group of industrial organic compounds with a common chemical structure, dialkyl or alkyl/ aryl esters of 1,2-benzenedicarboxylic acid (Annamalai and Vasudevan, 2020; Giuliani et al, 2020)
Gas chromatography (GC) methods combined with mass spectroscopy (MS), MS/MS, Electron capture detector (ECD) or flame ionization detectors (FID) have steadily become the main tool for identification and quantification of PEs in the 21st century (Yang et al, 2015; Salaudeen et al, 2018; Weizhen et al, 2020), and to some extent, liquid chromatography (LC) coupled to MS detector (He et al, 2020)
Occurrence of PEs in the environment is undoubtedly of great concern and more so in aquatic ecosystem where diverse sources are responsible for input of these toxic pollutants into the water and sediments
Summary
Phthalate esters (PEs) belong to a group of industrial organic compounds with a common chemical structure, dialkyl or alkyl/ aryl esters of 1,2-benzenedicarboxylic acid (Annamalai and Vasudevan, 2020; Giuliani et al, 2020). Global production of PEs is estimated at 6 to 8 million tons per annum (Seyoum and Pradhan, 2019) with utilization by various industrial companies sitting at more than 3 million tons (Zhang et al, 2021) These compounds are mainly used for enteric coatings of nutritional supplements and pharmaceutical pills, as viscosity controlling agents, emulsifying agents, lubricants, binders, gelling agents, stabilizers film formers, dispersants, and suspending agents but primarily as plasticizers (Ji et al, 2014; Wang B. et al, 2015; Wang et al, 2018; Heo et al, 2020; USEPA, 2021). The current state of knowledge regarding the occurrence, different extraction and analytical techniques and impacts of PEs in aquatic ecosystems is highlighted so as to provide a better understanding of their temporal and spatial distributions in aquatic systems and to aid in devising prudent means to curtail their ecological footprints
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