Sequential solid phase extraction protocol followed by liquid chromatography–atmospheric pressure chemical ionization–mass spectrometry for the trace determination of non ionic polyethoxylated surfactants in tannery wastewaters

1999 ◽  
Vol 19 (2) ◽  
pp. 101-110 ◽  
Author(s):  
Montserrat Castillo ◽  
Francesc Ventura ◽  
Damià Barceló
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