Abstract-Linear alkylbenzenes (LABs) were detected in the Point Loma Wastewater Treatment Plant (PLWTP) effluent, Tijuana River runoff, microlayer, water column particulates, and sediments collected off the coast of San Diego in 1994. The distributions of LABs in various media and sampling locations suggested that these compounds were essentially derived from domestic waste discharges. The PLWTP outfall is a major source for LAB inputs, while the Tijuana River runoff discharges much lower amounts of LABs. However, the contents of sewage-derived organics can be enhanced in the sea surface microlayer near the mouth of the Tijuana River. In addition, the I/E ratios indicated that 30-55% of the LABs were degraded in the water column particulates and sediments. Other processes (e.g., dilution, evaporation, bioaccumulation, etc.) may also be important in removing LABs from the discharge zone. Sewage-derived organic materials can be carried into remote areas via suspension of fine particulates.
Abstract. The effectiveness of solid phase extraction (SPE) using 90-mm EmporeTM C-18 bonded disks and liquid-liquid extraction (LLE) was compared in extraction of municipal wastewater effluent, as well as distilled and sea water. Both SPE and LLE obtained similar recoveries of polycyclic aromatic hydrocarbons and polychlorinated biphenyls from spiked distilled water. Higher recoveries of chlorinated pesticides were achieved from distilled water than from wastewater effluent by SPE. In addition, SPE yielded higher concentrations of PAHs and LABS from effluent samples than did LLE. Apparently, both SPE and LLE were affected by the presence of abundant dissolved organic carbon in wastewater effluent, but LLE suffered more losses. The condensed packing structure in C-18 disks might allow better extraction of hydrophobic organics from wastewater effluent. Alumina/silica gel clean-up after SPE was necessary to obtain acceptable quantitation results for wastewater effluent. SPE was technically as effective as LLE and superior to LLE, because it used less organic solvent and manpower. Usage of high density glass beads with C-18 disks further improved the efficiency of SPE. Lowering the cost of C-18 disks will make disk SPE more appealing. o 1995 John Wiley Sons, Inc
A previously developed two‐component model was used to estimate the magnitude of interference from tetrapropylene‐based alkylbenzenes (TABs) in measuring linear alkylbenzene (LAB) concentrations in a sediment core collected from the Palos Verdes Shelf (Los Angeles, CA, USA). The magnitude of such interference generally increased with increasing sediment core depth and was fairly high in deeper sediments, where TABs were abundant relative to LABs. Usage of LABs as sewage markers in sediments is generally valid as long as the approximate ratio of TAB to LAB concentration is less than 10.
Abstract-A previously developed two-component model was used to estimate the magnitude of interference from tetrapropylenebased alkylbenzenes (TABs) in measuring linear alkylbenzene (LAB) concentrations in a sediment core collected from the Palos Verdes Shelf (Los Angeles, CA, USA). The magnitude of such interference generally increased with increasing sediment core depth and was fairly high in deeper sediments, where TABs were abundant relative to LABs. Usage of LABs as sewage markers in sediments is generally valid as long as the approximate ratio of TAB to LAB concentration is less than 10.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.