CAJ | 학술논문

建立了一种新的锂离子选择电极体系，以水热法的MnO2为原料制备海胆球形的尖晶石锰酸锂，以其为活性载体，采用压片技术制备了锰酸锂-碳糊电极（LMO-CPE），该电极对Li+具有优良的电位响应特性。并探讨了响应机理，系统研究了电极组分配比、适用的pH值范围、检测下限、选择性系数等性能。实验结果表明：锰酸锂：乙炔黑：石蜡(质量分数比)=20∶50∶30时制备的LMO-CPE电极在1×10-5~1×10-1 mol/L范围内出现能斯特响应， pH=10时的响应性能最好，响应时间15 s以下，斜率可达到67．17 mV/dec，检测下限7．76×10-6 mol/L；采用混合溶液法测得Na+和K+选择性系数分别为1．02×10-3和1．97×10-3，Ca2+、Mg2+、Ba2+的选择性系数在10-5数量级以下，该类电极对于其他碱金属和碱土金属离子有好的选择性。
건립료일충신적리리자선택전겁체계，이수열법적MnO2위원료제비해담구형적첨정석맹산리，이기위활성재체，채용압편기술제비료맹산리-탄호전겁（LMO-CPE），해전겁대Li+구유우량적전위향응특성。병탐토료향응궤리，계통연구료전겁조분배비、괄용적pH치범위、검측하한、선택성계수등성능。실험결과표명：맹산리：을결흑：석사(질량분수비)=20∶50∶30시제비적LMO-CPE전겁재1×10-5~1×10-1 mol/L범위내출현능사특향응， pH=10시적향응성능최호，향응시간15 s이하，사솔가체도67．17 mV/dec，검측하한7．76×10-6 mol/L；채용혼합용액법측득Na+화K+선택성계수분별위1．02×10-3화1．97×10-3，Ca2+、Mg2+、Ba2+적선택성계수재10-5수량급이하，해류전겁대우기타감금속화감토금속리자유호적선택성。
A novel lithium ion-selective electrode constituted of a carbon paste electrode (CPE) modified with a Sea-urchins spherical spinel-type LiMn2O4 (LMO) has been investigated. The LiMn2O4 was prepared by MnO2 with Sea-urchins spherical which prepared with a common hydrothermal method. Experimental parameters, such as influence of the ratio of LiMn2O4 and paraffin oil, pH of the carrier solution and selectivity for Li+against other alkali and alkaline-earth ions were investigated. The Li+LMO-CPE with optimum composition exhibited a good linear response of 67.17 mV/dec in the range of 1×10-5~1×10-1 mol/L over a wide pH10 (NH3·H2O-NH4Cl buffer) and detection limit of 7.76×10-6 mol/L. Selectivity coefficients, Ki,j, have been determined for the LMO-CPE using a fixed interference methodology.Considering the interference of hydrogen ions, the K is 1.02×10-3,the K is 1.97×10-3. And the selectivity coefficients of Ca2+、Mg2+、Ba2+are all less than 10-5 . Therefore, the LMO-CPE has a highly selectivity for lithium ion over alkali and alkline earth ions.