DETERMINATION OF NI(II) IN ALLOYS USING A NEW REAGENT DERIVED FROM L-DOPA

Autor: Wagner José Barreto, Herica Aparecida Magosso, Miriam Fátima Soares, Bruno Marco Oliveira Silveira, Ieda Spacino Scarminio, Dílson Norio Ishikawa, Sônia Regina Giancoli Barreto

Publikováno v: Eclética Química, Vol 36, Iss 3, Pp 15-20 (2018)

A simple and sensitive UV-Vis spectrophotometric method was developed using a new chromogenic reagent, L-dopasemiquinone, for the quantification of Ni(II) in metallic alloys: Inox, Co-Cr, and Ni-Ti. The complex [Ni(II)(L1-)3]1- presents an intense ba

Externí odkaz: https://doaj.org/article/4cf8d4288eae43d5a0697c00496483bb

Avaliação do risco ambiental em sedimento dos lagos do Riacho Cambé, em Londrina, pela distribuição de metais Avaliation of the environmental risk by metal distribution in sediments from lakes formed by Cambé Stream at Londrina

Autor: Dílson Norio Ishikawa, Renata Zacarias Noale, Thiago Hideyuki Kobe Ohe, Eloana Benassi Ribeiro de Souza, Ieda Spacino Scarmínio, Wagner José Barreto, Sônia Regina Giancoli Barreto

Publikováno v: Química Nova, Vol 32, Iss 7, Pp 1744-1749 (2009)

The proposal of this study was to obtain the profile of these metals distribution Al, Co, Cu, Pb, Cr, Ni, Co and Zn in sediments from lakes in the city of Londrina-PR and evaluate the environmental risk resulting from such distribution. The parameter

Externí odkaz: https://doaj.org/article/4bce4f2709f24292bcf77df4067529c9

Determination of Ni(II) in metal alloys by spectrophotometry UV-Vis using dopasemiquinone

Autor: Marcus Vinícius Brás de Proença, Dílson Norio Ishikawa, Ieda Spacino Scarminio, Miriam de Fatima Soares, Sônia Regina Giancoli Barreto, Wagner José Barreto

Publikováno v: Química Nova, Vol 33, Iss 1, Pp 109-113 (2010)
Química Nova, Volume: 33, Issue: 1, Pages: 109-113, Published: 2010
Química Nova v.33 n.1 2010
Química Nova
Sociedade Brasileira de Química (SBQ)
instacron:SBQ

A spectrophotometric method was proposed for Ni(II) determination in alloys using a dopa-semiquinone (L-1) to form [Ni(II)(L1-)3]1-, ε = 9.3 x 10³ L mol-1 cm-1. The optimal conditions for the determination were: wavelength 590 nm, temperature 25 °

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3b63404d81be2d5279af33a9f7009077
https://doi.org/10.1590/s0100-40422010000100020

Fe, Mn, P and S Speciation in Sediments from the Capivara Hydroelectric Dam Lake (Brazil) as an Indicator of Anthropogenic Influences

Autor: Romilaine Mansano Nicolau, Sônia Regina Giancoli Barreto, Paulo dos Santos Nora, João de Souza Costa, Miriam de Fatima Soares, Adriana Celeste Esteves Gonçalves, Wagner José Barreto, Dílson Norio Ishikawa, Ieda Spacino Scarminio

Publikováno v: CLEAN – Soil, Air, Water. 36:353-359

The conservation of large water resources is essential for the preservation of human life. The quantification and, more importantly, the speciation of chemical substances that indicate the presence of anthropogenic contamination in water resources ar

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::af278c706b4bd3439d1d9bcf78635afe
https://doi.org/10.1002/clen.200700187

Analysis of Physical and Chemical Parameters for Discrimination of Water Origin in a Hydroelectric Reservoir

Autor: Wagner José Barreto, Melissa Tiemi Ogasawara, Maria Cristina Solci, Sônia Regina Giancoli Barreto, Sonia Naomi Nomi, Dílson Norio Ishikawa, Ieda Spacino Scarminio

Publikováno v: CLEAN – Soil, Air, Water. 35:239-245

Seventeen physical and chemical parameters were obtained from a hydroelectric reservoir located in a tropical region in the south of Brazil. Multivariate Principal Component Analysis (PCA) and Hierarchical Group Analysis (HGA) were used to identify t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c5b933ea848d13b0cf107e7b656d916e
https://doi.org/10.1002/clen.200700015