FAAS法研究六钛酸钾晶须对Cd(Ⅱ)的动/静态吸附行为  

Dynamic and Static State Adsorption Behavior of Cd(Ⅱ) Based on Potassium Hexatitanate Whisker by FAAS

作　　者：程永华[1] 

机构地区：[1]河南省平顶山学院化学系,河南平顶山467000

出　　处：《环境科学与技术》2009年第8期72-75,共4页Environmental Science & Technology

基　　金：科技部创新基金(05C26213100474);江苏省研究生培养创新工程(CX07B_176z)

摘　　要：以火焰原子吸收光谱法(FAAS)为检测手段,研究了六钛酸钾晶须对镉的动态、静态吸附性能,考察影响吸附率的相关因素,对比了静态、动态解吸回收率的影响,同时考察了解吸剂的酸度、流速、用量等对回收率的影响,结果表明:在动态实验中,pH7,流速1.0mL/min.,吸附剂用量0.1g时,Cd(Ⅱ)的吸附效果最佳;以10mL0.1mol/LHNO3为洗脱剂,流速为0.5mL/min时,可将Cd(Ⅱ)完全洗脱。静态实验中,pH7,六钛酸钾晶须用量0.2g,吸附率可达到90%以上。以25mL2mol/L的硝酸溶液对Cd(Ⅱ)进行洗脱,Cd(Ⅱ)的回收率可达99%以上。在优化的试验条件下,本法的检出限为12ng/mL;相对标准偏差为0.7%(Cd(Ⅱ):1μg/mL,n=11)。Dynamic and static state adsorption behavior of Cd （Ⅱ） with potassium hexatitanate whisker was studied systematically by flame atomic absorption spectrometry （FAAS） to investigate the absorption and disentangle on the recovery. In the dynamic condition, the adsorption rate of Cd （Ⅱ） by potassium hexatitanate whisker was over 90% at pH 7.0, velocity of flow 1.0mL/min and dosage 0.1g. Cd （Ⅱ） could be eluted from potassium hexatitanate whisker with 10mL 0.1mol/L HNO3 and velocity of flow 0.5mL/min. In the static state condition, the adsorption rate of Cd（Ⅱ） by potassium hexatitanate whisker was over 90% at pH 7.0 and 0.2g dosage. Cd （Ⅱ） could be eluted from potassium hexatitanate whisker with 25mL 2mol/L HNO3. The detection limits of CdⅡ） were 12ng/mL and relative standard deviation （RSD） was 0.7%.

关 键 词：FAAS 六钛酸钾 Cd(Ⅱ) 动/静态吸附 

分 类 号：X132[环境科学与工程—环境科学]