负载有结晶紫的微晶酚酞分离铅(Ⅱ)

Lead Separation Using Microcrystalline Phenolphthalein Loaded with Crystal Violet

研究了负载有结晶紫的微晶酚酞固相萃取分离富集Pb（Ⅱ）的新方法．在pH1．0～7．0的酸度范围内，Pb（Ⅱ）与I^-形成的络阴离子PbI4^2-能与结晶紫（CV^＋）形成疏水性三元离子缔合物[PbI4]^2-（CV^＋）。而被微晶酚酞吸附,在一定条件下，该体系能够使Pb（Ⅱ）与常见离子Zn（Ⅱ）、Fe（Ⅲ）、Co（Ⅱ）、Ni（Ⅱ）、Mn（Ⅱ）、Cr（Ⅱ）、Al（Ⅱ）等完全分离．

It is the first study that microcrystalline phenolphthalein was utilized as a solid phase adsorbent to preconcentrate and separate lead. At pH 1.0～7.0, Pb（ Ⅱ ） can react with I- to form complex anion PhI4^2- , and the resulting PhI4^2- reacts with CV^＋ to form ion-association complex [PhI4]^2-（CV^＋ ）2 which can be adsorbed on the surface of microcrystalline phenolphthalein. Under the optimum conditions, Pb（ Ⅱ ） can be totally separated from Zn（ Ⅱ ）, Fe（ Ⅲ ）, Co（ Ⅱ ）, Ni（ Ⅱ ）, Mn（ Ⅱ ）, Cr（ Ⅲ ） and Al（ Ⅲ ） etc.