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conferenceseries
.com
Volume 2
Environment Pollution and Climate Change
ISSN: 2573-458X
Climate Change 2018 &
Global ENVITOX 2018
October 04-06, 2018
October 04-06, 2018
London, UK
16
th
Annual Meeting on
Environmental Toxicology and Biological Systems
&
5
th
World Conference on
Climate Change
JOINT EVENT
Effects of size and surface chemistry on the uptake of Au ENPs into sediment-dwelling
Lumbriculus
variegatus
Ping Luo
1,4
, Karen Tiede
2
, Guibin Ma
3
, Jonathan G C Veinot
3
, Zhen Mao
1
, Jiachao Jiang
1
, Katie Privett
4
, Agnieszka Dudkiewicz
5
, Samuel Legros6
and
Alistair B A Boxall
4
1
School of Environment Science and Spatial Informatics—Chinese University of Mining and Technology, Xuzhou, China
2
Centre for Chemical Safety and Stewardship (CCSS)—Food and Environment Research Agency (FERA), UK
3
University of Alberta, Canada
4
University of York, UK
5
National Centre for Food Manufacturing—University of Lincoln, UK
6
CIRAD, UPR Recyclage et risque, Senegal
C
onsiderable efforts have being made to study the potential toxicity of engineered nanoparticles upon the uptake by aquatic
organisms. It is often stated that the uptake is related to physiochemical properties of engineered nanoparticles (ENPs),
such as particle size and surface coating. However, these claims are not sufficiently backed up with the evidences where
conflicting results are obtained in the published data. This study is hence focused on illustrating how these physiochemical
properties of Au ENPs affect the uptake of the ENPs in the sediment-dwelling
Lumbriculus variegatus
. The experiment was
composed of the uptake and depuration study of Au ENPs in sediment dwelling
Lumbriculus variegatus
as well as respective
sedimentation process in natural sediment. Studied Au ENPs were coated with either citrate (Au CIT), mercaptoundecanoic
acid (Au MUDA) or bovine serum albumin (Au BSA) and featured the size of 5 nm or 30 nm. Surface coating and particle
size were both found to be factors affecting the uptake and persistence of ENPs into the
Lumbriculus variegatus
. Comparing
with Au3+, the results showed that Au ENPs took more time to settle in the sediment, had more uptake during exposure and
also had more elimination during depuration. Eventually the persistence of Au in
Lumbriculus variegatus
ranked in regards
to the ENP size in the following order Au3+ > 5 nm > 30 nm. Surface coating influenced the uptake and persistence of Au
ENPs in
Lumbriculus variegatus
through the sedimentation efficiency and tissue affinity. The persistence of the Au ranked
with regards to ENP surface coating is Au BSA > Au CIT > Au MUDA. However, synchrotron XRF images showed that
Lumbriculus variegatus
exposing to Au CIT has more uptake of Au and healthy tissue, while ones exposing to Au MUDA have
less uptake but damaged tissue. It suggests that more and persisting ENPs uptake in the organism do not necessarily produce
more extensive tissue damage.
ping.luo@live.cnEnviron Pollut Climate Change 2018, Volume 2
DOI: 10.4172/2573-458X-C1-003