萃取-非水介质氢化物发生-ICP-AES中的干扰及Ni-Fe基合金的分析

本文结合溶剂萃取研究了非水介质中氢化物发生-ICP-AES的分析条件、干扰等因素的影响。利用KI~+H_2SO_4/MIBK萃取体系将As,Sb,Bi萃取到MIBK中而与基体元素分离,然后将该有机相与甲酸按等体积混合后,即可直接进行氢化物发生-ICP-AES分析。还对影响萃取和氢化物发生的一些因素及共存元素的干扰进行了讨论。该方法应用于Ni-Fe基合金中As和Sb的分析,取得了较满意的结果。

AÇÕES estratégicas de transferência de tecnologias para o aumento da produtividade do milho no Brasil.

2010

Avaliação multicritério para priorização de ações e tecnologias visando o desenvolvimento sustentável de Paty do Alferes, RJ.

2002

Contribuições da Embrapa Trigo e da Embrapa Transferência de Tecnologia ao desenvolvimento sustentável da reforma agrária no Rio Grande do Sul - ações e atividades realizadas de 2005 a 2008.

2009

Agricultura familiar: regulamentos para as ações coletivas.

2000

Interface of chip-based capillary electrophoresis-inductively coupled plasma-atomic emission spectrometry (CE-ICP-AES)

An interface of chip-based capillary electrophoresis (CE)-inductively coupled plasma-atomic emission spectrometry (ICP-AES) that is based on cross-flow nebulization has been developed. A polydimethylsiloxane (PDMS) CE-chip with conventional cross channel layout was used. A stainless steel tube was placed orthogonal to the exit of the CE separation channel for cross flow nebulization. A supplementary flow of buffer solution at the channel exit was used to improve nebulization efficiency. Two capillaries were inserted into the CE chip near the inlet of the separation channel for sample and buffer solution injection. Syringe pumps were used to manipulate the flow rate and flow direction of the sample, buffer, and supplementary buffer solution. Peak broadening due to the shape (bulb and tube-shaped) and size of the spray chambers was studied. The smaller tube-shaped spray chamber was used because of smaller peak broadening effect due to aerosol transport. The nebulization and transport efficiency of the CE-ICP interface was approximately 10%. Ba2+ and Mg2+ ions were eluted from the CE-chip within 30 s. Resolution of the Ba2+ and Mg2+ peaks was 0.7 using the chip-based CE-ICP-AES system.

Desafios para mitigação de impactos das ações antrópicas no Cerrado.

2008

Avaliação de ações prioritárias para conservação do Bioma Caatinga.

Este documento sintetiza as informações geradas nas duas últimas décadas por várias Instituições de Pesquisa, Desenvolvimento e Ensino do Brasil, no que se refere a elaboração de um diagnóstico do quadro natural e agrossocioeconômico deste tão importante ecossistema.