CAJ | 학술논문

将铋和聚苯胺共沉积在玻碳电极上制备了杂化膜,然后在杂化膜上沉积一层铋膜,制备了一种新颖的电化学传感器——有机-无机杂化复合铋膜电极(HCBiFE),用于痕量重金属离子Cd(Ⅱ)和Pb(Ⅱ)的检测(0.1mol/L醋酸缓冲溶液,pH 4.7).优化了镀膜条件、离子测试参数.在1～90 μg·L-1的浓度范围内,两离子溶出峰电流与浓度呈现出良好的线性关系,富集时间120 s时,Cd(Ⅱ)和Pb(Ⅱ)的检测限分别低至0.2,0.5μg·L-1.该复合膜具有很好的稳定性和重现性,能够抗机械剥蚀、不易脱落,对50 μg·L-1的Cd(Ⅱ)和Pb(Ⅱ)连续测定50次,相对标准偏差分别为4.3％,6.1％.30 d后,该复合膜电极对Cd(Ⅱ)和Pb(Ⅱ)溶出峰电流分别下降3.2％,4.9％,表明该复合膜电极性能稳定,有望应用于环境水体的现场监测.
장필화취분알공침적재파탄전겁상제비료잡화막,연후재잡화막상침적일층필막,제비료일충신영적전화학전감기——유궤-무궤잡화복합필막전겁(HCBiFE),용우흔량중금속리자Cd(Ⅱ)화Pb(Ⅱ)적검측(0.1mol/L작산완충용액,pH 4.7).우화료도막조건、리자측시삼수.재1～90 μg·L-1적농도범위내,량리자용출봉전류여농도정현출량호적선성관계,부집시간120 s시,Cd(Ⅱ)화Pb(Ⅱ)적검측한분별저지0.2,0.5μg·L-1.해복합막구유흔호적은정성화중현성,능구항궤계박식、불역탈락,대50 μg·L-1적Cd(Ⅱ)화Pb(Ⅱ)련속측정50차,상대표준편차분별위4.3％,6.1％.30 d후,해복합막전겁대Cd(Ⅱ)화Pb(Ⅱ)용출봉전류분별하강3.2％,4.9％,표명해복합막전겁성능은정,유망응용우배경수체적현장감측.
A novel electrochemical sensor(organic-inorganic hybrid composite bismuth film electrode)was fabricated on a glassy carbon substrate electrode by an electrochemical co-deposition of polyaniline and bismuth followed by plating a thin layer of bismuth on the hybrid film.The hybrid composite bismuth film electrode was applied to detect trace Cd(Ⅱ)and Pb( Ⅱ )in 0.1 mol/L acetate buffer solution(pH 4.7 )by square ware anodic stripping voltammetry.The influencing factors of stripping signals and the operational parameters were investigated in detail.The newly developed electrode revealed highly linear behavior in the examined concentration range from 1 to 90μg · L-1 for both test metal ions,with the detection limits of 0.2 μg · L-1 and 0.5 μg · L-1 for Cd( Ⅱ )and Pb( Ⅱ )respectively,offering good coefficients of variation(CVs)of 4.3％ and 6.1％ for Cd( Ⅱ )and Pb( Ⅱ )(50 μg · L-1,n=50)respectively.After 30 d,the stripping peak currents for 50 μg · L-1 Pb( Ⅱ )and Cd(Ⅱ)on the composite film were detected decreasing 3.2％ and 4.9％,respectively.The long term stability makes it possible to be applied in on-site monitoring of heavy metals in environmental water.