β-Cyclodextrin modified filter paper based solid phase extraction–room temperature phosphorimetry for preconcentration and determination of nitrogen heterocyclic compounds in water samples

Talanta ◽  
2007 ◽  
Vol 72 (5) ◽  
pp. 1630-1636 ◽  
Author(s):  
R ZHU ◽  
P WANG ◽  
X WANG ◽  
X SU
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