DEPURATION OF TRACE METALS IN TRANSPLANTED PERNA VIRIDIS FROM POLLUTED
1
Jr. of Industrial Pollution Control 29(1)(2013) pp 1-6
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DEPURATION OF TRACE METALS IN TRANSPLANTED PERNA VIRIDIS
FROM POLLUTED SITE AT KG PASIR PUTEH TO RELATIVELY
UNPOLLUTED SITES AT KG SG MELAYU AND SG BELUNGKOR IN
THE STRAITS OF JOHORE
Y.J. EUGENE NG 1, C.K. YAP *1, M.P. ZAKARIA 2, A.Z. ARIS 2 AND S.G. TAN 3
1
Department of Biology, Faculty of Science, 2 Department of Environmental Sciences, Faculty of
Environmental Studies, 3 Department of Cell and Molecular Biology, Faculty of Biotechnology and
Biomolecular Science, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia.
Key words: Accumulation, Transplantation, Mussels.
(Received 31 July, 2012; accepted 1 September, 2012)
ABSTRACT
Green-lipped mussels Perna viridis were transplanted from a known polluted site at Kg Pasir Puteh
(KPP) to two relatively unpolluted sites at Kg Sg Melayu (KSM) and Sg Belungkor (SB). Total soft
tissues of mussels were determined for Ag, As, Be, Co, Cr, Cs, Hg, Li, Mn, Se, Sr and V. After 6 weeks
of transplantation, KPP had higher levels of Co, Cr, Hg, Sr and V if compared to KSM and SB because
of the negative value in rate of depuration. As expected, the coastal waters at KSM and SB can be used
for depuration of trace metals Co, Cr, Hg, Li, Sr and V since their levels were lower when compared to
KPP population after transplantation. However, it was found that after weeks 2 and 6 of transplantation from KPP, KSM and SB had higher levels of Ag, As, Be and Se if compared to KPP. Present finding
revealed an unknown source of trace metal pollution at KSM and SB and future studies are much
needed to understand the sources for such elevation of trace metals in the active mussel aquacultural
site especially at KSM.
INTRODUCTION
Anthropogenic activities are major sources of trace
metal pollution in the coastal area (Amin et al., 2009).
Transplantation is widely used nowadays for a more
accuracy of metal pollution in the coastal waters. In
particular, marine mussels are suitable for
transplantation experiments because of several
advantages. Firstly, monitoring sites may be chosen
*Corresponding author’s email: yapckong@hotmail.com
independently without considering the presence of
natural populations (Hedouin et al., 2011). Secondly,
the transplanted mussels can be located to those
coastal waters in which the accessibility of
bioaccumulation status is hard-to-reach (Hunt and
Slone, 2010; Giarratano et al., 2010). Thirdly, the
intrinsic factors inherent in marine mussels including
age, size, stage of sexual maturity of mussels can be
controlled (Alfonso et al., 2010) besides the exposure
2
EUGENE ET AL.
times and depth of transplantation. Fourthly, the all
marine mussels investigated have a low genetic
variation and in the same phase of the reproductive
cycle since they are abundant and are of the same
source (Phillips and Segar, 1986). In addition, the
green-lipped mussel Perna viridis populations focused
in this study has been reported to have low genetic
variation and thus the mussel species is suitable to be
employed as a valid biomonitor in Peninsular
Malaysia (Yap et al., 2002a; Ong et al., 2009).
Therefore, by conducting transplantation
experiments, the influence of external and internal
factors such as seasonal variation, size or age which
are susceptible to induce bias in data comparison is
minimized (Regoli and Orlando, 1994 and Hedouin
et al., 2011). Hence, the trace metals accumulated in
the transplanted P. viridis in this study can provide
more accurate information on the trace metal
contamination in the study area.
In this study, mussels P. viridis were collected from
Kg Pasir Puteh (KPP) was used for transplantation
purpose because this site had been reported as being
contaminated by Cd, Pb, Cu and Zn (Yap et al., 2002b,
2003a, 2003b, 2004a, 2004b, 2006). Meanwhile, Kg.
Sg. Melayu (KSM) and Sg. Belungkor (SB) are two
relatively unpolluted sites (Yap et al., 2006) and the
mussels collected from KPP were placed in the coastal
waters of KSM and SB for two and six weeks for
depuration purpose. All the above three sites are
located in the Straits of Johore. The Straits of Johore is
a high mussel spatfall area in Peninsular Malaysia
besides Sebatu at Malacca coastal water (Al-Barwani
et al., 2007).
Therefore, the objective of this paper was to
determine the levels of 12 trace metals (Ag, As, Be, Co,
Cr, Cs, Hg, Li, Mn, Se, Sr and V) in the total soft tissues
(TST) of transplanted P. viridis from KPP to KSM and
SB.
MATERIALS AND METHODS
About 200 individuals of P. viridis were collected from
KPP in the Straits of Johore (Figure 1), on 28 November
2009. Mussel transplantation was conducted on the
same day in which those mussels collected from KPP
were transplanted in the coastal waters at KSM and
SB, both located in the Straits of Johore (Figure 1).
Samplings of mussels were conducted after 2 and 6
weeks from KSM and SB.
Prior to transplantation, after the mussels were
collected from KPP, all mussels were rinsed using
seawater for 3 times to get rid of any visible sediment
on the mussel shells. The mussels were then divided
randomly into sub-groups of 40 individuals and each
sub-group was placed in a polyethylene cage of 20 ×
15 × 18 cm which permitted water circulation through
it. Four cages were used per site and left suspended in
the water column at an average depth of 1.5m using a
rope which was modified from Faverney et al. (2010).
The collected mussels were rinsed with seawater
before being transported back to the laboratory in an
ice compartment at 10°C.
After the byssus of P. viridis were discarded, the
total soft tissues were then dried in an oven for 72
hours at 105°C to constant weight. TST were
homogenized and about half gram of sample was
digested using the CEM Microwave Sample
Preparation System following essentially the methods
of Zhou and Liu (1997). Seven mL of HNO3 and 1mL
of H2O2 were mixed with the dried samples in closed
Teflon vessels. The vessels were then sealed and placed
in a microwave oven at 220ºC for 30 minutes. The
resulting digests were then transferred to 100mL
volumetric flasks and diluted to 100mL using double
distilled water. The sample was then filtered through
Whatman No. 1 filter paper and the filtrate was stored
in an acid-washed pill box until metal analysis.
After filtration, the samples were analysed for Ag,
As, Be, Co, Cr, Cs, Hg, Li, Mn, Se, Sr and V using an
Inductively Coupled Plasma-mass Spectrometer with
Dynamic Reaction CellTM (ICP-MS DRCplus) (Perkin
Elmer ELAN DRCplus). The data are presented in µg/
kg dry weight. To avoid possible contamination, all
glassware and equipment used were acid-washed
and the accuracy of the analysis was checked against
blanks. For data validation, Certified Reference
Materials (CRM) for Mussel Tissue, no. 2976 (National
Institute of Standard and Technology (NIST), USA)
were also analyzed and checked for recoveries as
shown in Table 1.
t-test was conducted to see check if the metal levels
after transplantation periods (Weeks 2 and 6) are
significantly different from the initial week 0 metal
levels. The statistical analysis was done by using
STATISTICA StatSoft Inc. version 8.0 for Windows.
The rate of metal depuration was calculated
according to the following formula as suggested by
Yap et al. (2004a):
Rate of metals depuration
= Metal level end of metal exposure - Metal level end of metal depuration
Day(s) of metal depuration
DEPURATION OF TRACE METALS IN TRANSPLANTED PERNA VIRIDIS FROM POLLUTED
RESULTS
The concentrations of all 12 metals in the total soft
tissues of transplanted P. viridis from KPP to KSM
and SB are presented in Table 2. The concentrations
of Co, Cr, Hg, Li, Sr and V for the transplanted mussel
from KPP to KSM and SB were decreased after 2 and 6
weeks of transplantation. Thus, this is within our
expectation that the coastal waters at KSM and SB
can be used for depuration of trace metals Co, Cr, Hg,
Li, Sr and V.
3
On the other hand, the concentrations of Ag, As,
Be and Se were increased during the transplantation
period in both KSM and SB. For Cs and Mn, the
concentrations were increased at KSM, while the
concentrations were decreased in SB in both week 2
and week 6. Generally, all the trace metal levels in
weeks 2 and 6 were higher in KSM than in SB. This
indicated SB is a cleaner site for metal depuration
purpose when compared to KSM.
The depuration rate for the transplanted P. viridis
was shown in Table 3. The negative value in the Table
Table 1. A comparison of trace metal concentrations (µg/kg dry weight) between measured values and certified
values in the Certified Reference Materials (CRM) for Mussel Tissue, no. 2976 (National Institute of Standard and
Technology (NIST), USA).
Metals
Certified values (C)
Measured value (M)
Percentage of recovery
[(M/C) x 100]
Ag
As
Cr
Hg
Mn
Se
Sr
11.00
13,300.00
500.00
61.00
33,000.00
1,800.00
93,000.00
10.90
13,420.00
707.80
49.00
28,009.70
1,781.00
89,310.40
99.09
100.90
141.56
80.33
84.88
98.94
96.03
Note: Certified values for other trace metals that are not indicated are not available in the CRM.
Fig. 1 Transplantation map for Perna viridis. Note: A- Kampung Pasir Puteh; B- Sungai Melayu; C- Sg Belungkor.
EUGENE ET AL.
4
Table 2. Trace metal concentrations (mean±SE, µg/kg dry weight) in total soft tissue (TST) of transplanted Perna viridis
from Kg Pasir Puteh (week 0) to Kg. Sg. Melayu and Sg. Belungkor after weeks 0 and 6.
Metal
Weeks
Sg Melayu
Ag
0
2
6
0
2
6
0
2
6
0
2
6
0
2
6
0
2
6
0
2
6
0
2
6
0
2
6
0
2
6
0
2
6
0
2
6
76.338
210.534
213.614
4757.637
5464.833
5956.471
12.160
56.035
106.011
563.091
430.736
419.616
8026.202
7388.831
5745.234
78.636
274.735
513.898
122.597
10.697
4.955
13012.720
12694.295
9877.933
104257.215
124748.984
132477.894
1221.951
1485.530
1891.323
130747.688
123261.262
102359.888
4962.260
3987.353
3033.800
As
Be
Co
Cr
Cs
Hg
Li
Mn
Se
Sr
V
Belungkor
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
15.060
1.611
30.083
32.088
292.442
1572.625
0.584
4.696
34.233
6.204
55.467
59.654
95.464
184.677
218.017
9.974
34.424
223.440
9.223
0.309
1.611
32.880
399.852
358.737
948.782
9070.285
393.230
51.103
29.364
89.730
432.922
14.407
426.971
50.484
178.249
161.181
3 is due to the accumulation of Ag, As, Be, Cs, Mn and
Se, instead of depuration, in the transplanted mussels
after weeks 2 and 6.
DISCUSSION
From this study, the higher levels of Ag, As, Be and Se
in KSM and SB after transplantation periods when
compared to week 0 (original KPP population) could
be due to higher bio availabilities of these metals which
are related to anthropogenic inputs at KSM and SB.
The only direct observable activities found in KSM
are fish and mussel aquaculture and rubber plantation
(Yap et al., 2006) meanwhile only a jetty and
76.338
105.958
157.000
4757.637
5003.482
5936.400
12.160
20.330
26.900
563.091
422.699
344.300
8026.202
7083.293
5418.700
78.636
58.584
47.300
122.597
5.597
4.900
13012.720
11701.484
10340.000
104257.215
81915.097
70312.700
1221.951
1421.951
1533.000
130747.688
111003.234
95873.600
4962.260
3522.050
2893.400
T-Test
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
15.060
19.759
15.600
32.088
119.119
43.617
0.584
17.499
0.656
6.204
27.145
2.432
95.464
200.758
264.800
9.974
20.272
2.202
9.223
0.656
1.000
32.880
56.891
66.437
948.782
264.586
234.468
51.103
13.510
41.956
432.922
179.034
358.524
50.484
46.838
117.836
p< 0.05
p< 0.05
p< 0.05
p>0.05
p< 0.05
p< 0.05
p>0.05
p< 0.05
p>0.05
p>0.05
p< 0.05
p< 0.05
p< 0.05
p>0.05
p< 0.05
p< 0.05
p< 0.05
p< 0.05
p< 0.05
p< 0.05
p< 0.05
p< 0.05
p< 0.05
p>0.05
agricultural site was found in SB. Thus, both sites are
considered as relatively unpolluted sites in the Straits
of Johore. Present finding indicates a contamination
by Ag, As, Be and Se at KSM and SB.
The presence of higher Ag level in KSM and SB
could be due to the source from residential area nearby
because Ag was used as ornaments in people’s daily
life and erosion of silver ornaments in commercial
areas (Han et al., 2006). On the other hand, high level
of As found in this two sites could be due to the toxicity
in arsenic which can be used in wood preservative to
kill insects, bacteria and fungi (Rahman et al., 2004)
especially widely used in our rubber plantations and
As was also used as various agricultural insecticides
DEPURATION OF TRACE METALS IN TRANSPLANTED PERNA VIRIDIS FROM POLLUTED
Table 3. Rates of depuration for transplanted Perna viridis
from Kg Pasir Puteh to Kg. Sg. Melayu and Sg. Belungkor.
Rate of depuration
Metal
weeks
Sg Melayu
Belungkor
Ag
2
6
2
6
2
6
2
6
2
6
2
6
2
6
2
6
2
6
2
6
2
6
2
6
-9.585
-3.268
-50.514
-28.544
-3.134
-2.235
9.454
3.416
45.526
54.309
-14.007
-10.363
7.993
0.205
22.745
74.638
-1463.698
-671.921
-18.827
-15.937
534.745
675.900
69.636
45.916
-2.116
-1.921
-17.560
-28.066
-0.584
-0.351
10.028
5.209
67.351
62.083
1.432
0.746
8.357
0.025
93.660
63.636
1595.866
808.203
-14.286
-7.406
1410.318
830.335
102.872
49.259
As
Be
Co
Cr
Cs
Hg
Li
Mn
Se
Sr
V
Note: negative rates of depuration indicate higher metal
accumulations instead of depuration.
(Sabina et al., 2005). In addition, Se which was used in
glass production and rubber industry could be the
reason why Se level was high in KSM and SB.
However, whether all the above activities are the major
sources of tarce metal pollution at KSM and SB, only
future studies should be conducted to confirm this.
As expected, lower levels of some trace metals
including Co, Cr, Hg, Li, Sr and V were found in KSM
and SB after transplantation periods. The higher levels
of the above six metals at KPP could be related to large
shipyard repair and construction facilities, fossil fuel
fired electrical power plants and shipping dock
activities (Yap et al., 2003a; 2003b; 2006). Therefore,
KSM and SB are suitable sites for depuration of Co,
Cr, Hg, Li, Sr and V from the TST of contaminated
polluted P. viridis.
CONCLUSION
Present findings indicated that the coastal waters at
KSM and SB can be used for depuration of trace metals
5
Co, Cr, Hg, Li, Sr and V since their levels were lower
when compared to KPP population after 2 and 6 weeks
transplantation. However, mussels transplanted to
KSM and SB had higher levels of Ag, As, Be and Se if
compared to KPP, after the transplantation periods.
This revealed an unknown source of trace metal
pollution at KSM and SB. Thus, future studies are
much needed to understand the sources for such
elevation of trace metals in the active mussel
aquacultural site especially at KSM.
ACKNOWLEDGEMENTS
The authors wish to acknowledge the financial
support provided through the Research University
Grant Scheme (RUGS) [vote no. 9316800], provided by
Universiti Putra Malaysia.
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