Simultaneous preconcentration of copper, zinc, cadmium, and nickel in water samples by cloud point extraction using 4-(2-pyridylazo)-resorcinol and their determination by inductively coupled plasma optic emission spectrometry

2009 ◽  
Vol 171 (1-3) ◽  
pp. 1133-1138 ◽  
Author(s):  
Edson Luiz Silva ◽  
Paulo dos Santos Roldan ◽  
Maria Fernanda Giné
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