Application of Electroanalytical Chemistry in Heteropoly Compounds System──Studies on the Redox Properties of Bis( undecatungstometalate)Lanthanates

应用电化学方法，系统研究ｋｅｇｇｉｎ结构稀土取代衍生物Ｌｎ（ＭＷ＿（１１）＿２（Ｍ＝Ａｓ，Ｔｉ，Ｇａ，Ｌｎ＝Ｌａ，Ｃｅ，Ｐｒ，Ｎｄ，Ｓｍ，Ｅｕ，Ｇｄ，Ｄｙ）在溶液中的氧化还原性质，得其氧化顺序，提出还原机理。The redox properties of Ln(MW_(11))_2(M=As, Ti, Ga; Ln=La,ce,pr,Nd,Sm,Eu,Gd , Dy ) are systematically studied.It has been found that the redox order is La(AsW_(11))_2>La(TiW_(11))_2>La(GaW_(11))_2.The reduction process of Ln(MW_(11))_2 anion has been discussed.作者联系地址：哈尔滨工程大学化工系, 东北师范大学化学系Author's Address: Depertment of Chemical Engineering,Harbin Engineering University,Harbin 150001Liu JingfuDepartment of Chemistry,Northeast Normal University,Changchun 13002

The Preparation of Heteropoly Compound Polypyrrole Film Modified Electrode and Its Electrochemical Properties

报道四元杂多化合物Ｋ１０Ｈ３［Ｎｄ（ＳｉＭｏ７Ｗ４Ｏ３９）２］·ｘＨ２Ｏ（简写为Ｎｄ（ＳｉＭｏ７Ｗ４）２１３－）聚吡咯（ＰＰｙ）膜修饰电极的制备及其电化学性能．该电极保持了四元杂多化合物的电化学活性和电催化性能，并具有很好的稳定性，在酸性水溶液中对ＮＯ－２具有明显的催化作用．Electronically conducting polypyrrole doped with heteropolyanions K 10 H 3[Nd(SiMo 7W 4) 2]·xH 2O(denoted as [Nd(SiMo 7W 4) 2] 13- )was synthesized by electrochemical polymerization. This modified electrode maintains the electrochemical and electrocatalytic properties of heteropolyanion, with having good stability and electrocatalytic activity on the reduction of nitric oxide in acidic aqueous solution.作者联系地址：哈尔滨工程大学化工系,中国科学院长春应用化学研究所Author's Address: Department of Chemical Engineering, Harbin Engineering University, Harbin 150001 Liu Baifeng Dong Shaojun Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun 13002

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^