基于磁性分离富集的ICP-AES法测定水中痕量重金属研究【毕业设计】.doc

- PAGE I - （20 届） 本科毕业设计 基于磁性分离富集的ICP-AES法测定水中痕量重金属研究 所在学院 专业班级 化学 学生姓名 学号 指导教师 职称 完成日期 年 月 基于磁性分离富集的ICP-AES法测定水中痕量重金属研究 PAGE 12 PAGE 13 摘　要 【摘要】为了对水体中痕量Pb、Cd、Cr、Ni 进行快速准确分析，利用一种新型磁性纳米微粒Fe3O4(核)/ZrO2(壳)(以Fe3O4/ZrO2表示)，富集水相中的金属离子并在外加磁场下分离，用盐酸洗脱，采用电感耦合等离子体发射光谱 (ICP-AES) 测定洗脱液中的Pb、Cd、Cr、Ni的新方法。考察了溶液pH值、吸附时间、洗脱时间、浓度和共存离子等因素对分析物分离富集的影响。本法对Pb、Cd、Cr、Ni的检出限(3σ)分别为：13.5 ng/mL、1.01 ng/mL、2.94 ng/mL和3.31 ng/mL。该方法简单易操作、精密度高，用于各类水体中金属离子的检测，效果良好。 【关键词】Fe3O4/ZrO2复合材料；磁性分离富集；痕量重金属；电感耦合等离子体发射光谱。 Determination of trace metal in water by inductively coupled plasma-atomic emission spectrometry based on magnetic enrichment Abstract 【ABSTRACT】A new method has been established for the simultaneous pre-enrichment of trace metals( Pb, Cd, Cr and Ni ) prior to their determinations by inductively coupled plasma atomic emission spectrometry (ICP-AES) in water samples base on magnetic nano-Fe3O4 (core) /ZrO2 (shell) (Fe3O4 / ZrO2) . The factors affecting the separation and pre-enrichment of analytes such as pH, absorption time, elution time and concentration, interfering ions were studied. The detection limits of the method (3σ) were 13.5 ng/mL, 1.01ng/mL, 2.94ng/mL and 3.31mg/L, respectively. The results show that this method was simple, accurate, sensitive and could be applied for the pre-enrichment-separation and determination of trace metals in all kinds of water samples. 【KEYWORDS】Fe3O4/ZrO2 material; magnetic separation and concentration; trace metals; inductively coupled plasma-atomic emission spectrometry . 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc292627875 摘　要 PAGEREF _Toc292627875 \h 2 HYPERLINK \l _Toc292627876 Abstract PAGEREF _Toc292627876 \h 3 HYPERLINK \l _Toc292627877 1前言 PAGEREF _Toc292627877 \h 5 HYPERLINK \l _Toc292627878 1.1概述 PAGEREF _Toc292627878 \h 5 HYPERLINK \l _Toc292627879 1.2重金属的检测方法 PAGEREF _Toc292627879 \h 5 HYPERLINK \l _Toc292