M. R. Vardast NSAC. Optimization of dispersive liquid-liquid microextraction followed by flame atomic absorption determination of Cu (II), Ni (II) and Co (II) based on the complexation reaction with phenathrene-9, 10-dine dioxime (PD). JBPR [Internet]. 2013Dec.30 [cited 2024May11];2(6). Available from: http://jbpr.in/index.php/jbpr/article/view/342