2 documents found, page 1 of 1
Spectrophotometric determination of uranium using 2-(2- Thiazolylazo)-p-Cresol ...
Teixeira,Leonardo Sena Gomes; Costa,Antonio Celso Spínola; Ferreira,Sérgio Luís Costa; Freitas,Maria de Lourdes; Carvalho,Marcelo Souza deA sensitive and selective spectrophotometric method is proposed for the rapid determination of uranium using 2-(2- Thiazolylazo)-p-Cresol (TAC). The reaction between TAC and uranium (VI) is instantaneous at pH 6.5 and the absorbance remains stable for over 3 h. N-cetyl-N,N,N-trimethylamonium bromide (CTAB) and triton X-100 are used for increasing the sensitivity and solubility of the system respectively. The me...
Spectrophotometric Determination of Aluminium in Iron Ores Using Solid-Phase Ex...
Ferreira,Sérgio Luis Costa; Lemos,Valfredo Azevedo; Costa,Antônio Celso Spinola; Jesus,Djane Santiago de; Carvalho,Marcelo Souza deIn the present paper, a procedure for separation and determination of aluminium in iron matrices is proposed. It is based on the solid-phase extraction of the iron, in the form of thiocyanate complexes, by a polyurethane(PU) foam. The followings parameters were studied: effect of pH and of the thiocyanate concentration on the iron extraction, shaking time required for quantitative extraction, amount of PU foam ...