Estimates of the inputs of polychlorinated biphenyls and organochlorine insecticides to the River Thames derived from the sediment record

Abstract

of 0.23 from the sediment surface to −2.29 m OD changed to 0.32 and subsequently increased to 0.62 between −5.82 m to −9.55 m OD. A number of factors may account for changes in microbial dechlorination activity. However, the possibility that changes in input sources were responsible for such effects cannot be discounted.

Butyltin compounds in a sediment core from the old Tilbury basin, London, UK

“…This resulted in improvements in river water quality and a reduction in concentrations of contaminants associated with the sediments (Scrimshaw and Lester, 1997;Wiese et al, 1997). This is illustrated in Fig.…”

“…2) and the most probable source of these compounds has been identified as the sewage treatment works (STW) at Beckton and Crossness (Scrimshaw and Lester, 1997;Wiese et al, 1997). It had been assumed that a single event of rapid accretion had possibly occurred at depths below -5.3 m OD.…”

“…The collection of the core used for this study and the dating of the core material has been described in detail (Scrimshaw and Lester, 1997;Wiese et al, 1997), with the samples analyzed here taken from core 1. The sampling location (Fig.…”

The fate of steroid estrogens: partitioning during wastewater treatment and onto river sediments

“…The location of the coring site was fixed in such a way that there was a correlation of sediment depth with dates from historical sounding (depth) charts (Scrimshaw and Lester 1997). Table 2 1997b; Scrimshaw and Lester 1997).…”

“…In the aquatic environment these compounds are amenable to biotransformation (Lai et al 2002a), although they also demonstrate bioaccumulation (Gomes et al 2004b) and as a consequence of this behaviour, complex issues for environmental health arise (Lai et al 2002c;. Sediments may become both a sink and a source for contaminants and thus an understanding of the potential for steroid estrogens to become deposited in sediments is important in understanding their environmental impact (Dowson et al 1993;Scrimshaw and Lester 1997;Braga et al 2000;Scrimshaw et al 2005;Jones et al 2006).…”