Journal of Environmental Treatment Techniques
2020, Volume 8, Issue 3, Pages: 978-984
claimed that metal in water can enter the plants by the intracellular
(symplastic) and extracellular (apoplastic) pathways. However,
The authors declare that there is no conflict of interest that
would prejudice the impartiality of this scientific work.
the cell wall of plants limits the extracellular transport in the root
and lead to lower detection of Ag in the aerial part of plants. For
this experiment, only the root parts of the plant had to submerge
in the media; thus, the majority of the accumulated metal
nanoparticles are more likely to be attached and move in through
the plant roots. Therefore, these particles have low interaction
with the aerial part of the plant since the cell wall has a high cation
exchange capacity. However, silver is known to be toxic to some
plants, inhibiting enzymes and altering the permeability of the cell
membrane wall. Thus, a number of silver species are still able to
make their way into the leaves of plants. This indicates that silver
is not necessarily bound only to the root tissue of plants. The
silver species can be transported through damaged cells or these
species can utilize transport proteins to translocate from roots to
leaves [56, 57, 58].
All authors of this study have a complete contribution for data
collection, data analyses and manuscript writing.
Ellis, L.-J. A., Baalousha, M., Valsami-Jones, E., Lead, J. R.
Seasonal variability of natural water chemistry affects the fate and
behaviour of silver nanoparticles. Chemosphere. 2018. 191, 616–
2. Zhang, C., Hu, Z., Deng, B. Silver nanoparticles in aquatic
environments: Physiochemical behavior and antimicrobial
mechanisms. Water Research. 2016. 88, 403–427.
Lodeiro, P., Achterberg, E. P., Pampín, J., Affatati, A., El-Shahawi,
M. S. Silver nanoparticles coated with natural polysaccharides as
models to study AgNP aggregation kinetics using UV-Visible
spectrophotometry upon discharge in complex environments.
Science of the Total Environment. 2016. 539, 7–16.
Buric, P., Jaksic, Z., Stajner, L., Sikiric, M.D., Jurasin, D., Cascio,
C., Calzolai, L., Lyons, D.M. Effect of silver nanoparticles on
Mediterranean Sea urchin embryonal development is species-
specific and depends on the moment of first exposure. Marine
Environmental Research. 2015. 111, 50-59.
AgNPs rapidly change in particle size and surface chemistry
upon exposure to media and interaction with their chemical
environments such as salinity and pH. These exposures need to
be considered in evaluating the hazard and risks of AgNPs toward
the aquatic ecosystem since they affect the speciation of AgNPs
and their toxicity. Toxic effects can be enhanced or decreased due
to the transformations of AgNPs in the water environment by
bioaccumulation and the dissolution of AgNPs to the formation
of Ag+ ions. On the other hand, phytoremediation is a natural
method that utilizes the plant's metabolic system to remove,
reduce, degrade, assimilate, and metabolize AgNPs in water
sources and store them in the biomass of the plants. The
appropriate selection of aquatic plants can remediate AgNPs-
contaminated water. Heavy metal contamination is a growing
environmental concern; thus, successful removal using
phytoremediation approaches with duckweeds, waterweeds,
floating, and submerge macrophytes should be studied further to
provide an environmentally benign solution to the problem.
Additional studies need to be performed using macrophytes and
similar organisms to determine the most effective way for silver
Fabrega, J., Zhang, R., Renshaw, J.C., Liu, W.T., Lead, J.R. Impact
of silver nanoparticles on natural marine biofilm bacteria.
Chemosphere. 2011a. 85, 961-966.
Fabrega, J., Luoma, S.N., Tyler, C.R., Galloway, T.S., Lead, J.R.
Silver nanoparticles: behavior and effects in the aquatic
environment. Environment International. 2011b. 37, 517-531.
Kumahor, S.K., Hron, P., Metreveli, G., Schaumann, G.E., Vogel,
H.J. Transport of citrate-coated silver nanoparticles in unsaturated
sand. Science of the Total Environment. 2015. 535, 113-121.
Braun, A., Klumpp, E., Azzam, R., Neukum, C. Transport and
deposition of stabilized engineered silver nanoparticles in water-
saturated loamy sand and silty loam. Science of the Total
Environment. 2015. 535, 102-112.
Metreveli, G., Philippe, A., Schaumann, G.E. Disaggregation of
silver nanoparticle homoaggregates in a river water matrix. Science
of the Total Environment. 2015. 535, 35-44.
0. Gambardella, C., Costa, E., Piazza, V., Fabbrocini, A., Magi, E.,
Faimali, M., Garaventa, F. Effect of silver nanoparticles on marine
organisms belonging to different trophic levels. Marine
Environmental Research. 2015. 111, 41-49.
1. McGillicuddy, E., Murray, I., Kavanagh, S., Morrison, L., Fogarty,
A., Cormican, M., Dockery, P., M. Prendergast, N. R., Morris, D.
Silver nanoparticles in the environment: Sources, detection, and
ecotoxicology. Science of the Total Environment. 2017. 575, 231-
The authors would like to acknowledge the Universiti
Teknologi Malaysia and Ministry of Education of Malaysia for
Q.J130000.2522.19H06. The authors also appreciate UTM
Zamalah for providing a scholarship in favor of the undertaken
2. Ma, Y., Metch, J.W., Vejerano, E.P., Miller, I.J., Leon, E.C., Marr,
L.C., Vikesland, P.J., Pruden, A. Microbial community response of
nitrifying sequencing batch reactors to silver, zero-valent iron,
titanium dioxide, and cerium dioxide nanomaterials. Water
Research. 2015. 68, 87-97.
3. Cui, B., Ren, L., Xu, Q.H. Silver_ nanoparticles inhibited
erythrogenesis during zebrafish embryogenesis Aquatic
Toxicology. 2016. 177, 295-305.
Authors are aware of, and comply with, best practice in
publication ethics specifically with regard to authorship
(avoidance of guest authorship), dual submission, manipulation
of figures, competing interests and compliance with policies on
research ethics. Authors adhere to publication requirements that
submitted work is original and has not been published elsewhere
in any language.
14. Begum, A.N., Aguilar, J.S., Elias, L., Hong, Y. Silver nanoparticles
exhibit coating and dose-dependent neurotoxicity in glutamatergic
neurons derived from human embryonic stem cells.
Neurotoxicology. 2016. 57, 45-53.