Trace metals in bivalves and sediments from Tolo Harbour, Hong Kong

Chu, Ka Hou; Cheung, W.M.; Lau, Shing-Tak Douglas

doi:10.1016/0160-4120(90)90202-h

Cited by 33 publications

(12 citation statements)

References 15 publications

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“…These values decline to 36.56, 174.2, 70.65 and 0.78 mg kg -1 , respectively, in site L and drop further to 28.75, 123.2, 46.02 and 0.29 mg kg -1 in site P, which is located in Tolo Channel. The spatial distribution patterns of the four heavy metals are supported by previous research in Tolo Harbour (Chu et al 1990;Lam et al 1997;Owen and Sandhu 2000). It has been documented by Chu et al (1990) that higher concentrations of metals, especially Cu, Zn and Cd, were found in sediments from inner Tolo Harbour (20-150, 25-180, 3-7 mg kg -1 ) than in sediments from Tolo Channel (5-25, 25-35, 3-4 mg kg -1 ).…”

Section: Spatial Distributions Of Heavy Metals and Source Apportionmentsupporting

confidence: 54%

“…In addition to the natural input of heavy metals from the sulphide minerals, anthropogenic sources of heavy metals associated with urban and industrial activities were also important inputs to marine sediments, which should also be (Wong et al 1980;Yim and Leung 1978;Owen and Sandhu 2000;Zhou et al 2007). Copper sulphate, extensively used to treat diseases in fishes cultured in floating cages, may contribute high copper concentration observed in this area (Chu et al 1990). …”

Section: Spatial Distributions Of Heavy Metals and Source Apportionmentmentioning

confidence: 99%

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Spatio-temporal trends of heavy metals and source apportionment in Tolo Harbour, Hong Kong

Chen

Jiao

2009

Environ Earth Sci

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This study provided a picture of the spatial and temporal distributions of Cr, Co, Ni Cu, Zn, As, Cd and Pb in bottom sediments of Tolo Harbour. The concentrations of the eight heavy metals differed significantly between sites due to the poor tidal flushing in Tolo Harbour. The levels of Cu, Zn, Cd and Pb were generally enriched in sediments from inner Tolo Harbour, while sediments from outer Tolo Harbour (Tolo Channel) had higher levels of Cr, Co and Ni. The redox sensitive element arsenic showed no distinct spatial pattern in Tolo Harbour. The decreasing levels of Cu, Zn, Pb and Cd in sediments with increasing distance from land demonstrated a typical diffusion pattern from land to the direction of sea. Two hot spots of Cu, Zn, Pb and Cd in sediments were located near Tai Po and Sha Tin new town, indicating that Cu, Zn, Pb and Zn were from land-derived sources. The sites with relatively high levels of Cr, Co and Ni in sediments were located in areas close to waste spoil in sea floor. The natural and anthropogenic inputs from Sha Tin and Tai Po to Tolo Harbour were mostly responsible for Cu, Zn, Cd and Pb enrichment in sediments from inner Tolo Harbour. The waste spoil in sea floor was believed to contribute to the Cr, Co and Ni in outer Tolo Harbour. The results of correlation coefficient between the eight heavy metals showed that Cu, Zn, Cd and Pb were strongly positively correlated, and Cr, Co and Ni were also significantly correlated with each other. The best explanation of strong correlation was their similar source. As, however, is not well correlated with the other seven heavy metals. The average concentrations of Cu and Zn displayed general increasing trends from 1978 to 2006 in Tolo Harbour, while the mean levels of Cr and Pb displayed a substantial decrease from 1978 to 1987, then a slight increase after 1987. No distinct temporal trends of the concentrations of Ni and As were observed from 1978 due to the inconsecutive data. On the other hand, the increasing trends of Cr, Cu, Zn, Cd and Pb were observed since 1996.

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Section: Spatial Distributions Of Heavy Metals and Source Apportionmentsupporting

confidence: 54%

Section: Spatial Distributions Of Heavy Metals and Source Apportionmentmentioning

confidence: 99%

Spatio-temporal trends of heavy metals and source apportionment in Tolo Harbour, Hong Kong

Chen

Jiao

2009

Environ Earth Sci

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“…(Pentreath 1973, Bryan 1976, Phillips 1976. In general terms, the concentration of metals in soft tissues is higher in winter than in summer as reported for many marine bivalves: Mytilus edulis (Phillips 1976, Amiard et al 1986), M. galloprovincialis (Majori et al 1978), Perna vindis (Chu et al 1990), Crassostrea gigas (Boyden & Phillips 1981) and Macoma balthica (Bordin et al 1992). In addition, Phillips (1976) concluded that high flesh weights in mussels were associated with low metal concentrations whilst metal contents did not change with individual weight.…”

Section: Resultsmentioning

confidence: 65%

Bioavailable heavy metals in estuarine waters as assessed by metal/shell-weight indices in sentinel mussels Mytilus galloprovincialis

Soto¹,

Kortabitarte²,

Marigómez³

1995

Mar. Ecol. Prog. Ser.

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Seasonal variations in metal concentrations in soft tissues of marine mussels can be due, to a great extent, to seasonal changes in flesh weight. Consequently, this event results in an unpredictable overestimation of metal bioavailability when the metal concentration in soft tissues is considered as an index of such metal bioavallability. The Abra estuary (Bizkaia, Bay of Biscay, Spain) was used as a natural experimental basin with well-known differences in the levels of metallic pollutants. The level of metal bioavailability was determined at various sites at different times of the year. For this purpose the conventional approach of recording metal concentrations in soft tissues and the approach based on the calculation of metal/shell-weight indices, first proposed by Fischer (1983), were applied. We concluded that seasonal changes in organism condition (Flesh Condition Index) cause unpredictable oscillations in the metal concentration in soft tissues. For this reason the direct use of metal concentration values is not recommended to assess metal bioavailability. The metal/shell-weight indices, however, were not affected by seasonal changes in the flesh weight of sentinel mussels and thus may provide a more realistic indication of metal bioavailability. In the present study, different metal bioavailabilities, assessed by metal/shell-weight indices, were found at different sampling sites, according to the influence of industrial activities. Seasonal trends in metal/shell-weight indices (attributed to different metal inputs at different tlmes) were also recorded. In conclusion, metal/shell-weight indices, characterized by a high sensitivity and a low noise-to-signal ratio, are a simple and rehable tool for assessing metal bioavailability in 'Mussel Watch' monitonng programmes.

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“…The spatial variation may not be due only to the different salinities of seawater, as this difference was only distinctly observed in the wet season, but also to the variation of Ag biokinetics consistently found in all seasons. Spatial and temporal differences in metal concentrations have been observed previously in bivalves (Amiard et al 1986, Chu et al 1990, Bordin et al 1992. Metal concentrations in bivalves from unpolluted sources were often higher in winter and lower in spring or summer, which may be related to the gonad maturation and spawning of the bivalves.…”

Section: Discussionmentioning

confidence: 85%

Subcellular controls of silver biokinetics in the green mussel Perna viridis from two hydrographic zones

Ng¹,

Wang²

2005

Mar. Ecol. Prog. Ser.

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The roles of subcellular distribution on silver (Ag) accumulation and elimination in the green mussel Perna viridis collected from 2 hydrographical zones (harbour vs. estuarine) in Hong Kong during 3 different seasons were investigated. Ag concentration and biokinetics varied widely between the 2 zones, but were less variable among the different seasons (pre-wet, wet and dry). The harbour population had a 2-to 6-fold higher Ag tissue concentration than the estuarine population. The insoluble fraction was the predominant pool for Ag subcellular distribution in the green mussels. In both the pre-wet and wet seasons, a lower Ag tissue concentration was associated with the insoluble fraction in the estuarine population as compared to the harbour population. Ag uptake from the aqueous phase was faster in the estuarine population during all seasons, but no significant relationship between Ag uptake and salinity was found in this study. Dietary uptake of Ag was similar in both populations, although there was a slight difference in assimilation from diatoms and natural seston. Efflux of Ag was 2 times faster in the estuarine population during the wet and dry seasons, which may partially explain the lower Ag tissue burden in the mussels. These results demonstrated a close correlation between Ag kinetics and its subcellular distribution. The percentage of Ag in the heatsensitive proteins correlated positively to the influx of dissolved Ag and Ag efflux, but negatively to the dietary assimilation. On the other hand, a higher percentage of Ag in the insoluble fraction was related to a higher dissolved uptake rate constant and a lower assimilation. Thus, the role of the individual subcellular fraction in the uptake was exposure pathway-specific. This study highlights the importance of subcellular Ag partitioning in controlling its accumulation and detoxification in bivalves.KEY WORDS: Uptake · Efflux · Mussels · Hydrographical zones · Hong KongResale or republication not permitted without written consent of the publisher

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Trace metals in bivalves and sediments from Tolo Harbour, Hong Kong

Cited by 33 publications

References 15 publications

Spatio-temporal trends of heavy metals and source apportionment in Tolo Harbour, Hong Kong

Spatio-temporal trends of heavy metals and source apportionment in Tolo Harbour, Hong Kong

Bioavailable heavy metals in estuarine waters as assessed by metal/shell-weight indices in sentinel mussels Mytilus galloprovincialis

Subcellular controls of silver biokinetics in the green mussel Perna viridis from two hydrographic zones

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