纳米TiO_2预富集FAAS法测定痕量Mo(Ⅵ)的研究  

Study on Detection of Trace Mo(VI) by Nanometer-TiO_2-Preconcentration FAAS

作　　者：刘向云[1] 田大民[1] 李晓[2] 陈松涛[1] 谢吉民[3] 

机构地区：[1]河南城建学院化工系,河南平顶山467044 [2]中平能化集团尼龙化工公司化工二厂,河南平顶山467000 [3]江苏大学化学化工学院,江苏镇江212013

出　　处：《化工时刊》2010年第6期12-14,32,共4页Chemical Industry Times

摘　　要：采用FAAS法研究了纳米TiO2材料对溶液中痕量Mo(Ⅵ)的分离与富集性能,分别考察了酸度对吸附率、解脱剂浓度和温度对Mo(Ⅵ)回收率、干扰离子对Mo(Ⅵ)含量测定等的影响,并对实际水样中钼离子进行了分离、回收和FAAS法检测。研究结果表明,纳米TiO2可定量吸附Mo(Ⅵ),当pH值约为1.0时,吸附率达到最大;以NaOH为解脱剂,当浓度大于0.2 mol/L,在室温下解脱振荡10 min,Mo(Ⅵ)的回收率达到最大值;除磷以外大多数共存离子不影响Mo(Ⅵ)含量的测定;在优化实验条件下,纳米TiO2对Mo(Ⅵ)的静态吸附容量为1.04 mg.g-1,FAAS法对Mo(Ⅵ)的检出限为12.0 ng.mL-1,相对标准偏差(RSD)为2.9%(n 6,含Mo为5.0μg.mL-1)。A new method was proposed for separation,enrichment and detection of trace Mo（Ⅵ） using nanometer TiO2 by FAAS.The effects of acidity on adsorption ratio,concentration of desorption reagent and temperature on Mo（Ⅵ） recycle ratio,interferential ions on detection of Mo（Ⅵ） concentration were investigated,respectively.Mo（Ⅵ） in actual aqueous samples was separated,recovered and detected by FAAS method.The results showed that Mo（Ⅵ） could be adsorbed by nanometer TiO2,furthermore,adsorption ratio could reach to maximum when pH=1.0;when concentration of NaOH solution was more than 0.2 mol/L,Mo（Ⅵ） recycle ratio reached the most at room temperature;The detection of Mo（Ⅵ） didn＇t affect by most coexisting ions except for phosphor element;In optimized experiment condition,the measured static absorption capacities of nanometer-size titanium oxide on Mo（Ⅵ） ions was 1.04 mg·g^-1,the detection limits of FAAS method for Mo（Ⅵ） was 12.0 ng·mL^-1,the RSD of the method was 2.9%（n=6,with concentration of Mo（Ⅵ） 5.0 μg·mL^-1）.

关 键 词：FAAS法 纳米TIO2 预富集 Mo(Ⅵ)含量 

分 类 号：O657.31[理学—分析化学] O647.3[理学—化学]