检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
作 者:杨欣[1,2] 徐玲玲 周秋兰[1] 林世新[1] 李龙飞[1]
机构地区:[1]怀化学院化学与化学工程系,湖南怀化418008 [2]怀化学院民族药用植物资源研究与利用湖南省重点实验室,湖南怀化418008 [3]武汉市化学工业研究所有限责任公司,湖北武汉430064
出 处:《分析测试学报》2011年第11期1257-1261,共5页Journal of Instrumental Analysis
基 金:怀化学院校级科研课题(HHUY2011-08);湖南省高校"中药制剂工程与质量控制"产学研合作示范基地建设项目;湖南省教育厅科研基金资助项目(10C1059);怀化学院重点学科建设项目
摘 要:构建了基于石墨烯(GS)-纳米金(Au)复合纳米微粒修饰印刷电极(SPCEs)的电化学传感器(SPCEs│GS/Au),建立了微分脉冲溶出伏安(DPSV)法测定水中痕量镉的电分析方法。采用扫描电镜(SEM)对电极表面进行了表征,DPSV法研究了镉的电化学性质。在优化实验条件下,溶出峰电流与Cd2+的质量浓度在2.5×10-7~2.5×10-5 g/L范围内呈良好线性,相关系数为0.998 0,检出限为1.8×10-7 g/L。将该方法用于实际水样的测定,回收率为96%~107%,实验结果与石墨炉原子吸收光谱(GF-AAS)法一致。该传感器采用复合纳米微粒修饰SPCEs,既能富集Cd2+又能扩增响应电流,且一次使用可抛弃、样品用量少、操作简便,可快速、准确地测定水样中的痕量镉。An electrochemical sensor based on graphene sheets (GS) and gold nano-particles (Au) composite nano-particles modified screen-printed carbon electrodes(SPCEs) was fabricated( SPCEs [ GS/Au), and an electrochemical method was developed for the determination of trace cadmium (Cd) in water by differential pulse stripping voltammetric (DPSV) method. Au preparation and the construction processes of SPCEs I GS/Au electrode were characterized by scanning electron micrography (SEM), and the electrochemical properties of Cd^2+ were investigated. Under the optimum conditions, a good linear relationship was obtained between peak current and Cd^2+ concentration in the range of 2. 5 ×10^-7 -2.5 ×10^-5 g/L(r2 =0. 998 0) with a detection limit(3tr) of 1.8 ×10^-7 g/L. The method was applied in the determination of Cd^2 + concentration in real water samples with recoveries of 96% - 107%. The analytical results were consistent with those of the graphite furnace atomic absorption spectrometric (GF -AAS) method. The SPCEs I GS/Au electrode showed a high response current and an enrichment ability clue to the modification of composite nano-particles. Therefore, the electrode was suitable for the determination of Cd^2+ in water with advantages of disposable design, lit- tle sample consumption and simple, operation.
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.33