Preparation of dithizone grafted poly(allyl chloride) core–shell–shell magnetic composite microspheres for solid-phase extraction of ultra-trace levels of Pb( <scp>ii</scp> ), Cu( <scp>ii</scp> ) and Cr( <scp>iii</scp> ) ions

Lei Zhang, Weibing Zhang, Zhichao Xiong et al.|RSC Advances|2015

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