We measured the level of uric lead in workers exposured and nonexposured lead by DPSA,GFAAS and DCM.The basic parameters of the three methods demonstrated that sensitivity and precision of DPSA and GFAAS excelled that...We measured the level of uric lead in workers exposured and nonexposured lead by DPSA,GFAAS and DCM.The basic parameters of the three methods demonstrated that sensitivity and precision of DPSA and GFAAS excelled that of DCM,but the linear range of DPSA and GFAAS are more narrow than that of DCM.All of The three methods had excellent accuracy(paired t-test P>0 05).The results showed the different of the three methods no significant.展开更多
制备了一种硫脲分子PNTU探针,基于其对Hg^(2+)的专一性比色识别,建立了荧光猝灭法测定Hg^(2+)含量的方法。在4-溴-1,8-萘酐的乙醇溶液中,逐滴加入2 mL 80%(质量分数)水合肼溶液,反应完成后,经抽滤,乙醇、水洗涤后干燥,再加入10 mL吡咯烷...制备了一种硫脲分子PNTU探针,基于其对Hg^(2+)的专一性比色识别,建立了荧光猝灭法测定Hg^(2+)含量的方法。在4-溴-1,8-萘酐的乙醇溶液中,逐滴加入2 mL 80%(质量分数)水合肼溶液,反应完成后,经抽滤,乙醇、水洗涤后干燥,再加入10 mL吡咯烷,在氮气保护下继续反应,得到红褐色固体。将其溶于15 mL乙腈中,室温搅拌下滴加1 mL异硫氰酸苯酯,反应完成后,经减压浓缩、水洗得到PNTU探针。将PNTU探针溶液与体积比为8∶2的乙腈-4-羟乙基哌嗪乙磺酸缓冲液的混合液混匀,然后加入含Hg^(2+)的样品溶液,采用荧光猝灭法测定体系的荧光强度。结果显示:当加入Hg^(2+)时,体系的荧光强度明显降低,溶液颜色由黄色变成橙红色;干扰试验表明PNTU探针在有其他金属离子存在的情况下仍可检测出Hg^(2+);Hg^(2+)浓度在20.0μmol·L-1以内与其对应体系的荧光强度降低值呈线性关系,检出限(3S/N)为1.8 nmol·L-1;对实际水样进行3个浓度水平的加标回收试验,Hg^(2+)的回收率为99.6%~104%,测定值的相对标准偏差(n=5)为0.85%~2.6%。基于PNTU探针制备了Hg^(2+)的检测试纸,可方便快捷地检测样品中是否存在Hg^(2+)。展开更多
Paper-based sensing platform is a point of need analytical toolkit for safety testing.However,the sensitivity,specificity,and simplicity are still challenging.Herein,we report a novel strategy(Au/δ-MnO_(2) hollow nan...Paper-based sensing platform is a point of need analytical toolkit for safety testing.However,the sensitivity,specificity,and simplicity are still challenging.Herein,we report a novel strategy(Au/δ-MnO_(2) hollow nanosphere and 3,3′,5,5′-tetramethylbenzidine(TMB)induced test strips for signal-on detection)that can be utilized for hexavalent chromium(Cr^(6+))detection.Interestingly,Cr^(6+)(CrO_(4)^(2−)) as a smart switch can remarkably enhance the oxidase-like activity of Au/δ-MnO_(2) hollow nanosphere.The presence of Cr^(6+) can regulate the surface electronic redistribution of Au/δ-MnO_(2) and adjust the geometric configuration,which leads to the improvement in oxidase-like activity of Au/δ-MnO_(2).As a proof-of-concept application,a visual paper-based sensing platform of Cr^(6+) along with quantitative analysis by the test strips was successfully constructed.This paper-based sensing platform exhibits a linear range with excellent selectivity for other interfering substances and lower limit of detection of 0.09μmol·L^(−1),providing a promising toolkit at-home Cr^(6+) measurement and environmental monitoring.展开更多
文摘We measured the level of uric lead in workers exposured and nonexposured lead by DPSA,GFAAS and DCM.The basic parameters of the three methods demonstrated that sensitivity and precision of DPSA and GFAAS excelled that of DCM,but the linear range of DPSA and GFAAS are more narrow than that of DCM.All of The three methods had excellent accuracy(paired t-test P>0 05).The results showed the different of the three methods no significant.
基金This work was financially supported by Xuzhou science and technology plan project of China(No.KC21294).
文摘Paper-based sensing platform is a point of need analytical toolkit for safety testing.However,the sensitivity,specificity,and simplicity are still challenging.Herein,we report a novel strategy(Au/δ-MnO_(2) hollow nanosphere and 3,3′,5,5′-tetramethylbenzidine(TMB)induced test strips for signal-on detection)that can be utilized for hexavalent chromium(Cr^(6+))detection.Interestingly,Cr^(6+)(CrO_(4)^(2−)) as a smart switch can remarkably enhance the oxidase-like activity of Au/δ-MnO_(2) hollow nanosphere.The presence of Cr^(6+) can regulate the surface electronic redistribution of Au/δ-MnO_(2) and adjust the geometric configuration,which leads to the improvement in oxidase-like activity of Au/δ-MnO_(2).As a proof-of-concept application,a visual paper-based sensing platform of Cr^(6+) along with quantitative analysis by the test strips was successfully constructed.This paper-based sensing platform exhibits a linear range with excellent selectivity for other interfering substances and lower limit of detection of 0.09μmol·L^(−1),providing a promising toolkit at-home Cr^(6+) measurement and environmental monitoring.
