Faculty of Medicine, University of Banja Luka, Banja Luka, Bosnia and Herzegovina.
University of Belgrade-Faculty of Mining and Geology, Belgrade, Serbia.
PLoS One. 2019 Feb 6;14(2):e0210904. doi: 10.1371/journal.pone.0210904. eCollection 2019.
The porous spinel oxide nanoparticles, MnCo2O4, were synthesized by citrate gel combustion technique. Morphology, crystallinity and Co/Mn content of modified electrode was characterized and determined by Fourier transform infra-red spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction pattern analysis (XRD), simultaneous thermogravimetry and differential thermal analysis (TG/DTA). Nanoparticles were used for modification of glassy carbon electrode (GCE) and new sensor was applied for simultaneous determination of Pb(II) and Cd(II) ions in water samples with the linear sweep anodic stripping voltammetry (LSASV).The factors such as pH, deposition potential and deposition time are optimized. Under optimal conditions the wide linear concentration range from 0.05 to 40 μmol/dm3was obtained for Pb(II), with limit of detection (LOD) of 8.06 nmol/dm3 and two linear concentration ranges were obtained for Cd(II), from 0.05 to 1.6 μmol/dm3 and from 1.6 to 40 μmol/dm3, with calculated LOD of 7.02 nmol/dm3. The selectivity of the new sensor was investigated in the presence of interfering ions. The sensor is stable and it gave reproducible results. The new sensor was succesfully applied on determination of heavy metals in natural waters.
采用柠檬酸凝胶燃烧法合成了多孔尖晶石氧化物纳米粒子 MnCo2O4。通过傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、能谱（EDS）、X 射线衍射图案分析（XRD）和同步热重和差热分析（TG/DTA）对修饰电极的形貌、结晶度和 Co/Mn 含量进行了表征和测定。将纳米粒子用于修饰玻碳电极（GCE），并将新传感器应用于水样中 Pb(II)和 Cd(II)离子的同时测定，采用线性扫描阳极溶出伏安法（LSASV）。优化了 pH 值、沉积电位和沉积时间等因素。在最佳条件下，获得了 Pb(II)的宽线性浓度范围为 0.05 至 40 μmol/dm3，检测限（LOD）为 8.06 nmol/dm3，Cd(II)的两个线性浓度范围分别为 0.05 至 1.6 μmol/dm3 和 1.6 至 40 μmol/dm3，计算的 LOD 为 7.02 nmol/dm3。在存在干扰离子的情况下，研究了新传感器的选择性。传感器稳定，结果重现性好。该新传感器成功应用于天然水中重金属的测定。
