Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Lilibeth dlC. Coo"'
Autor:
Ma. Cristine Faye J. Denna, Bryan A. Rivera, Razelle Angela B. Camitan, Dan Alfonso O. Yabut, Lilibeth dlC. Coo
Publikováno v:
Sensors and Actuators B: Chemical. 260:445-451
This study describes the selective determination of copper (II) using the recently developed polymer inclusion membrane (PIM) in a river water system via a continuous flow (CF) system. The PIM is composed of 42% di(2-ethlyhexyl) phosphoric acid (D2EH
Publikováno v:
Talanta. 82:1156-1163
A general mathematical model of a flow-through optical chemical sensor prepared by the immobilization of 1-(2′-pyridylazo)-2-naphthol (PAN) into a commercial Nafion ® membrane was developed. The model takes into account the preparation of the opto
Publikováno v:
Talanta. 68:298-304
A flow injection-column preconcentration-hydride generation atomic absorption spectrophotometric (FI-column-HGAAS) method was developed for determining μg/l levels of As(III) and As(V) in water samples, with simultaneous preconcentration and speciat
Autor:
Imee Su Martinez, Lilibeth dlC. Coo
Publikováno v:
Talanta. 64:1317-1322
An optical chemical sensor responsive to selenium (SeO 3 2− ) in water samples was developed. Its matrix was nafion membrane suffused with an organic ligand p -amino- p ’-methoxydiphenylamine or variamine blue (VB). The method of analysis was flo
Publikováno v:
Talanta. 58:1063-1069
A copper-sensitive optical chemical sensor (optrode) is described. The optrode is based on a Nafion membrane and an immobilized organic ligand coupled with a flow injection (FI) system. The FI system includes a flow-through removable measuring cell a
Publikováno v:
Electroanalysis. 12:841-845
Publikováno v:
Analytica Chimica Acta. 392:201-211
The extraction of PAN (1-(2′-pyridylazo)-2-naphthol) from neutral ethanol–water solutions into Nafion ® membranes was studied using a system consisting of two thermostated (25°C) extraction cells clamped on opposite sides of a circular Nafion
Autor:
Lilibeth dlC. Coo, Terence J. Cardwell, Maruse Sadek, Robert T. C. Brownlee, Robert W. Cattrall, Spas D. Kolev
Publikováno v:
Analytica Chimica Acta. 386:137-144
The values of the diffusion coefficient of PAN (1-(2′-pyridylazo)-2-naphthol) in various ethanol–water solutions at 298 K were determined using both flow injection (FI) and nuclear magnetic resonance (NMR) techniques. The transient FI concentrati
Publikováno v:
Analytica Chimica Acta. 360:153-159
The solubility and the protolytic constants of 1-(2-pyridylazo)-2-naphthol (PAN) have been accurately determined at temperatures between 20.0 and 30.0°C in ethanol–water solutions with ethanol concentrations ranging from 10.0% to 95.0% (v/v). The
Publikováno v:
Analytica chimica acta. 803
A disposable paper-based sensor (PBS) is described for the determination of Cu(II) in natural and waste waters at approximately 2 cents per measurement. The device makes use of a polymer inclusion membrane (PIM) to provide the selectivity for Cu(II).