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Geranmayeh Oromieh, Aidin, 2011. Evaluating solubility, aggregation and sorption of nanosilver particles and silver ions in soils. Second cycle, A2E. Uppsala: SLU, Dept. of Soil and Environment

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Abstract

Engineered nanoparticles (ENPs) are used in so many different products. ENPs are released
into different environmental compartments. Silver nanoparticle (AgNP) is one of the most
used ENPs. AgNPs may cause damage to the environment due to their toxicity and wide
exposure. In this thesis possible exposure ways of AgNPs to the environment was reported.
Also sorption-solubility and aggregation of AgNPs and AgNO3 based on the different
concentration of Ag and pH function in clayey and sandy soil was investigated.

Results showed that sorption of both silver nanoparticles and silver ions by the soils were
increased with increasing pH. Silver (nano/ion) sorption ratio in clayey treatment was slightly
higher than sandy one. It can be due to having higher CEC value and finer texture in clay in
comparison with sand. Partitioning between nanosilver and free silver ions was investigated
by help of ultrafiltration. It can be concluded that a significant fraction of the silver
nanoparticles were oxidized and transformed to free Ag+ during the oxic experimental
conditions.

The aggregation of AgNPs and silver ions was investigated based on the different
concentration of silver in a constant pH. Aggregation of silver nanoparticulate by help of
SEM and XRD were identified in 2.5 ppm concentration of AgNPs in sandy soil. No
aggregation was found at low concentration of silver nanoparticles. No silver aggregated spot
could be recognized at 6.7, 0.65 and 0.05 ppm concentration of silver in silver nitrate polluted
soil samples.

Main title:Evaluating solubility, aggregation and sorption of nanosilver particles and silver ions in soils
Authors:Geranmayeh Oromieh, Aidin
Supervisor:Berggren Kleja, Dan and Kessler, Vadim and Hallin, Sara
Examiner:Eriksson, Jan
Series:Examensarbeten (Institutionen för mark och miljö, SLU)
Volume/Sequential designation:2011:08
Year of Publication:2011
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:NM010 Soil and Water Management - Master's Programme 120 HEC
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Keywords:silver nitrate, silver nanoparticle (AgNP), soil, solubility, aggregation
URN:NBN:urn:nbn:se:slu:epsilon-8-1018
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-8-1018
Subjects:Soil science and management
Soil chemistry and physics
Pollution
Language:English
Deposited On:21 Mar 2011 12:37
Metadata Last Modified:06 Oct 2012 15:50

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