The biogeochemical behaviour of Cd, Cu, Pb and Zn in the Scheldt estuary: results of the 1995 surveys

Baeyens, Willy; Parmentier, K.; Goeyens, Léo; Ducastel, Geert; Gieter, M. De; Leermakers, Martine

doi:10.1007/978-94-017-3573-5_3

Cited by 20 publications

(34 citation statements)

References 9 publications

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“…The extension of the area under anoxic conditions changes over the year due to differences in freshwater input, temperature and organic loading, and is smaller in winter periods (Zwolsman and Van Eck, 1993). Recent observations made by Zwolsman et al (1997), Paucot and Wollast (1997) and Baeyens et al (1998b) indicate that the anoxic area has moved from salinity 15 in 1978 to salinity < 7-8 at present, thanks to improved waste-water treatment in the hinterland (Fig. 3).…”

Section: Dissolved Oxygen and Phmentioning

confidence: 96%

“…Although part of the data (Mn, Cd, Ni, Zn) discussed in the present paper were published earlier (Duinker et al, 1982a), it is interesting, also in a historical context, to compare them with data published recently. Due to the reduction of local inputs and the improvement of waste-water treatment, the anoxic zone has now moved upstream to a salinity of around 7 in summer (Zwolsman et al, 1997;Baeyens et al, 1998b). In winter, with high river discharges, the situation has improved to the extent that no anoxic zone exists in the upper estuary any more (Zwolsman et al, 1997;Baeyens et al, 1998b).…”

Section: Introductionmentioning

confidence: 99%

“…Due to the reduction of local inputs and the improvement of waste-water treatment, the anoxic zone has now moved upstream to a salinity of around 7 in summer (Zwolsman et al, 1997;Baeyens et al, 1998b). In winter, with high river discharges, the situation has improved to the extent that no anoxic zone exists in the upper estuary any more (Zwolsman et al, 1997;Baeyens et al, 1998b). With the information of the present situation in the Scheldt estuary and our historical data, it will be interesting to investigate which impact the changed situation has on the trace metal distributions.…”

Section: Introductionmentioning

confidence: 99%

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Contrasting behaviour of trace metals in the Scheldt estuary in 1978 compared to recent years

Nolting

Helder

Baar

et al. 1999

Journal of Sea Research

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Section: Dissolved Oxygen and Phmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Contrasting behaviour of trace metals in the Scheldt estuary in 1978 compared to recent years

Nolting

Helder

Baar

et al. 1999

Journal of Sea Research

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“…The physical, chemical and biological processes that occur in an aquatic environment often affect the inorganic elements and heavy metal concentrations [15,16]. Human activities, which control these processes, have been reported to increase the concentration of metals in many of the natural water systems [17].…”

Section: Discussionmentioning

confidence: 99%

Arsenic Levels in the Environment and Foods Around Kisumu, Kenya

Makokha¹,

Kinyanjui²,

Magoha³

et al. 2012

TOENVIEJ

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Abstract:The objective of this study was to determine the level of arsenic in the environment and in foods consumed around Kisumu, and compare these levels with the recommended WHO maximum limits. Arsenic was determined in water samples from Lake Victoria, River Nyamasaria, tap water as well as in the soil samples. It was also determined in staple foods including maize, beans, fish and vegetables. Arsenic content in the samples was determined using Atomic Absorption Spectrophotometry. The results showed that arsenic content in the water and soil ranged from 0.00 to 8.30 ng/100 ml and 12.39 to 24.36 g/100 g, respectively, and the mean arsenic levels in all water and soil samples were within the safe WHO limits for arsenic. The arsenic content in the maize and bean samples ranged from 5.21 to 7.03 g/100 g. The arsenic content in the vegetables and fish ranged from 2.89 to 7.34 and 4.31 to 7.66 g/100 g, respectively. The arsenic content in all the food samples were also within the safe WHO arsenic limits. However, there were variations in arsenic contents between the species of fish studied. The arsenic content was significantly higher in soil samples in comparison to water samples (p<0.05). Overall the arsenic levels in all the food, water and soil samples were within the maximum WHO safe limits. It is recommended that continuous monitoring of arsenic levels of water, soil and foods be put in place since there could be seasonal variations in their levels.

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“…In order to avoid the possible organic contamination from membrane filters, some researchers (Dubruiel et al, 1997;Khan et al, 1998) used glass fiber filters for dissolved organic carbon determination while some other researchers used the membrane filters after decontaminating them. Rinsing the filters with dilute nitric acid, dilute hydrochloric acid followed by distilled water, or deionized distilled water (DDW) have been reported as the decontamination methods (Buffle et al, 1992;Baeyens et al, 1998;Karanfil et al, 2003). Hwang et al (1979) examined the concentrations of total organic carbon (TOC), chemical oxygen demand (COD) and nitrate in the filtrates of a Millipore mixed cellulose acetate and cellulose nitrate membrane filter.…”

Section: Introductionmentioning

confidence: 99%

Effect of Leaching from Filters on Laboratory Analyses of Collective Organic Constituents

Khan¹,

Subramania-Pillai²

2006

proc water environ fed

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Membrane and glass fiber filters are widely used in laboratory water and wastewater analyses. During sample filtration, some filters release organic compounds, which may interfere with organic analyses. This research investigated the interferences due to organic leaching in the determinations of dissolved organic carbon, biodegradable dissolved organic carbon, soluble biochemical oxygen demand, and soluble chemical oxygen demand and the appropriate cleaning method for the filters. Nineteen filters studied included 16 membrane filters and 3 glass fiber filters. A wide variation was observed on the amount and characteristics of organics leaching from the filters. Some filters showed no organic leaching while some others had very high organic leaching. Soaking the filters in deionized distilled water (DDW) resulted in more leachable organics from the filters compared with filtering DDW through them. Certain filters should be avoided for use in the above analyses and soaking in DDW is a more suitable cleaning method than discarding initial filtration volumes for most filters.

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The biogeochemical behaviour of Cd, Cu, Pb and Zn in the Scheldt estuary: results of the 1995 surveys

Cited by 20 publications

References 9 publications

Contrasting behaviour of trace metals in the Scheldt estuary in 1978 compared to recent years

Contrasting behaviour of trace metals in the Scheldt estuary in 1978 compared to recent years

Arsenic Levels in the Environment and Foods Around Kisumu, Kenya

Effect of Leaching from Filters on Laboratory Analyses of Collective Organic Constituents

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