Evaluating the graphene oxide dispersions for fish embryo toxicity (FET) test.
The Fish Embryo Toxicity (FET) test has wide utilization in nanoecotoxicology. However, some difficulties have been found related to the aggregation and precipitation of nanomaterials in exposure medium and the contrasting results among studies due to differences in the material characteristics. Furthermore, abiotic factors as the presence of organic matter can influence the test evaluation. The aim of this study was to evaluate and characterize the effect of the humic acid presence in the stability of two types of graphene oxide dispersion in an exposure medium used in FET test. Stock-suspensions (1.0 mg mL-1) of GO (sigma Aldrich, flakes) or base-washed GO (bwGO) and humic acid (HA sodium salt, Sigma Aldrich) were prepared in ultrapure water (UW). They were sonicated before preparing the GO or bwGO test suspensions at 100.0 µg mL-1 in UW and reconstituted water (RW, pH 8±0.2, 425±129 µS/cm), with HA (20.0 µg mL-1)or not. The samples were incubated during 96h at 26oC. The GO and bwGO and its dispersions were characterized through the following techniques: spectrophotometry, centrifugation, dynamic light scattering (DLS), nanoparticle tracking analysis (NTA), thermogravimetry (TGA), and X-ray photoelectron spectrometry (XPS). The results showed that materials aggregated and precipitated quickly in RW, but in the presence of HA the stability was similar to that found in UW. The aggregation and precipitation of bwGO was more intense than that of GO. The bwGO showed a great particle sizes heterogeneity than GO, in any condition tested. The different behavior can be related to the less presence of oxygenated groups in bwGO regards to GO. These results showed that surface characteristic of GO and the presence of HA influence the GO behavior in exposure medium and support the use of HA as a natural dispersant to graphene oxide in FET test.
Main Authors: | , , , , |
---|---|
Other Authors: | |
Format: | Separatas biblioteca |
Language: | pt_BR por |
Published: |
2017-04-06
|
Subjects: | FET test, Ecotoxicologia., Peixe., Graphene, |
Online Access: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/1068204 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
dig-alice-doc-1068204 |
---|---|
record_format |
koha |
spelling |
dig-alice-doc-10682042017-08-16T04:28:13Z Evaluating the graphene oxide dispersions for fish embryo toxicity (FET) test. CLEMENTE, Z. CASTRO, V. L. S. S. de FRANQUI, L. SILVA, C. A. MARTINEZ, D. S. T. ZAIRA CLEMENTE, CNPEM; VERA LUCIA SCHERHOLZ S DE CASTRO, CNPMA; LIDIANE FRANQUI, CNPEM; CRISTIANE A. SILVA, CNPEM; DIEGO STEFANI TEODORO MARTINEZ, CNPEM. FET test Ecotoxicologia. Peixe. Graphene The Fish Embryo Toxicity (FET) test has wide utilization in nanoecotoxicology. However, some difficulties have been found related to the aggregation and precipitation of nanomaterials in exposure medium and the contrasting results among studies due to differences in the material characteristics. Furthermore, abiotic factors as the presence of organic matter can influence the test evaluation. The aim of this study was to evaluate and characterize the effect of the humic acid presence in the stability of two types of graphene oxide dispersion in an exposure medium used in FET test. Stock-suspensions (1.0 mg mL-1) of GO (sigma Aldrich, flakes) or base-washed GO (bwGO) and humic acid (HA sodium salt, Sigma Aldrich) were prepared in ultrapure water (UW). They were sonicated before preparing the GO or bwGO test suspensions at 100.0 µg mL-1 in UW and reconstituted water (RW, pH 8±0.2, 425±129 µS/cm), with HA (20.0 µg mL-1)or not. The samples were incubated during 96h at 26oC. The GO and bwGO and its dispersions were characterized through the following techniques: spectrophotometry, centrifugation, dynamic light scattering (DLS), nanoparticle tracking analysis (NTA), thermogravimetry (TGA), and X-ray photoelectron spectrometry (XPS). The results showed that materials aggregated and precipitated quickly in RW, but in the presence of HA the stability was similar to that found in UW. The aggregation and precipitation of bwGO was more intense than that of GO. The bwGO showed a great particle sizes heterogeneity than GO, in any condition tested. The different behavior can be related to the less presence of oxygenated groups in bwGO regards to GO. These results showed that surface characteristic of GO and the presence of HA influence the GO behavior in exposure medium and support the use of HA as a natural dispersant to graphene oxide in FET test. 2017-04-06T11:11:11Z 2017-04-06T11:11:11Z 2017-04-06 2016 2017-08-01T11:11:11Z Separatas In: ENCONTRO ANUAL DA SOCIEDADE BRASILEIRA DE PESQUISA EM MATERIAIS, 15., 2016, Campinas. [Abstracts...] Rio de Janeiro: Sociedade Brasileira de Pesquisas em Materiais, 2016. Resumo B6E2. http://www.alice.cnptia.embrapa.br/alice/handle/doc/1068204 pt_BR por openAccess |
institution |
EMBRAPA |
collection |
DSpace |
country |
Brasil |
countrycode |
BR |
component |
Bibliográfico |
access |
En linea |
databasecode |
dig-alice |
tag |
biblioteca |
region |
America del Sur |
libraryname |
Sistema de bibliotecas de EMBRAPA |
language |
pt_BR por |
topic |
FET test Ecotoxicologia. Peixe. Graphene FET test Ecotoxicologia. Peixe. Graphene |
spellingShingle |
FET test Ecotoxicologia. Peixe. Graphene FET test Ecotoxicologia. Peixe. Graphene CLEMENTE, Z. CASTRO, V. L. S. S. de FRANQUI, L. SILVA, C. A. MARTINEZ, D. S. T. Evaluating the graphene oxide dispersions for fish embryo toxicity (FET) test. |
description |
The Fish Embryo Toxicity (FET) test has wide utilization in nanoecotoxicology. However, some difficulties have been found related to the aggregation and precipitation of nanomaterials in exposure medium and the contrasting results among studies due to differences in the material characteristics. Furthermore, abiotic factors as the presence of organic matter can influence the test evaluation. The aim of this study was to evaluate and characterize the effect of the humic acid presence in the stability of two types of graphene oxide dispersion in an exposure medium used in FET test. Stock-suspensions (1.0 mg mL-1) of GO (sigma Aldrich, flakes) or base-washed GO (bwGO) and humic acid (HA sodium salt, Sigma Aldrich) were prepared in ultrapure water (UW). They were sonicated before preparing the GO or bwGO test suspensions at 100.0 µg mL-1 in UW and reconstituted water (RW, pH 8±0.2, 425±129 µS/cm), with HA (20.0 µg mL-1)or not. The samples were incubated during 96h at 26oC. The GO and bwGO and its dispersions were characterized through the following techniques: spectrophotometry, centrifugation, dynamic light scattering (DLS), nanoparticle tracking analysis (NTA), thermogravimetry (TGA), and X-ray photoelectron spectrometry (XPS). The results showed that materials aggregated and precipitated quickly in RW, but in the presence of HA the stability was similar to that found in UW. The aggregation and precipitation of bwGO was more intense than that of GO. The bwGO showed a great particle sizes heterogeneity than GO, in any condition tested. The different behavior can be related to the less presence of oxygenated groups in bwGO regards to GO. These results showed that surface characteristic of GO and the presence of HA influence the GO behavior in exposure medium and support the use of HA as a natural dispersant to graphene oxide in FET test. |
author2 |
ZAIRA CLEMENTE, CNPEM; VERA LUCIA SCHERHOLZ S DE CASTRO, CNPMA; LIDIANE FRANQUI, CNPEM; CRISTIANE A. SILVA, CNPEM; DIEGO STEFANI TEODORO MARTINEZ, CNPEM. |
author_facet |
ZAIRA CLEMENTE, CNPEM; VERA LUCIA SCHERHOLZ S DE CASTRO, CNPMA; LIDIANE FRANQUI, CNPEM; CRISTIANE A. SILVA, CNPEM; DIEGO STEFANI TEODORO MARTINEZ, CNPEM. CLEMENTE, Z. CASTRO, V. L. S. S. de FRANQUI, L. SILVA, C. A. MARTINEZ, D. S. T. |
format |
Separatas |
topic_facet |
FET test Ecotoxicologia. Peixe. Graphene |
author |
CLEMENTE, Z. CASTRO, V. L. S. S. de FRANQUI, L. SILVA, C. A. MARTINEZ, D. S. T. |
author_sort |
CLEMENTE, Z. |
title |
Evaluating the graphene oxide dispersions for fish embryo toxicity (FET) test. |
title_short |
Evaluating the graphene oxide dispersions for fish embryo toxicity (FET) test. |
title_full |
Evaluating the graphene oxide dispersions for fish embryo toxicity (FET) test. |
title_fullStr |
Evaluating the graphene oxide dispersions for fish embryo toxicity (FET) test. |
title_full_unstemmed |
Evaluating the graphene oxide dispersions for fish embryo toxicity (FET) test. |
title_sort |
evaluating the graphene oxide dispersions for fish embryo toxicity (fet) test. |
publishDate |
2017-04-06 |
url |
http://www.alice.cnptia.embrapa.br/alice/handle/doc/1068204 |
work_keys_str_mv |
AT clementez evaluatingthegrapheneoxidedispersionsforfishembryotoxicityfettest AT castrovlssde evaluatingthegrapheneoxidedispersionsforfishembryotoxicityfettest AT franquil evaluatingthegrapheneoxidedispersionsforfishembryotoxicityfettest AT silvaca evaluatingthegrapheneoxidedispersionsforfishembryotoxicityfettest AT martinezdst evaluatingthegrapheneoxidedispersionsforfishembryotoxicityfettest |
_version_ |
1756023553629618176 |