液相电导法测定氯化氢脱析速率

介绍了采用液相电导法测定氯化氢脱析速率,从而测试聚氯乙烯树脂稳定性的方法,该方法能提供PVC树脂脱HCl的诱导期、降解速率及降解全过程的信息,与刚果红和老化白度法相比,能确切地反映树脂的热稳定性。     

Trichloroacetic acid‐imprinted polypyrrole film and its property in piezoelectric quartz crystal microbalance and electrochemical sensors to application for determination of haloacetic acids disinfection by‐product in drinking water

A molecularly trichloroacetic acid (TCAA) imprinted non‐crosslinked polypyrole (TCAA‐MIPpy) has been successfully prepared and evaluated in its properties for both piezoelectric quartz crystal microbalance (QCM) and electrochemical means of detection, and application of such sensors for determination of haloacetic acid concentrations in water. Haloacetic acid selectivity was demonstrated in gravimetric or in electrochemical sensors via either cyclic voltammetric or inter‐digitated conductometric (IDC) analyses studies upon comparison with nonimprinted polypyrrole and TCAA‐imprinted polypyrrole. The measurement results with all these systems revealed that the prepared molecularly imprinted polymer can recognize TCAA well from structurally similar compounds. The TCAA‐MIPpy incorporated with only the IDC transduction system produced the specific signal for TCAA detection in aqueous environment, which is useful for the quantifying TCAA disinfection by‐product in water. The analytical application for determination of TCAA in real‐life samples was readily achieved with the incorporation of TCAA‐MIPpy in the IDC analysis system, the results revealing the high sensitivity and selectivity of the method. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Conductometric determination of sulfur in organic substances

A conductometric method is considered for determining sulfur contents in organic substances, in particular in diesel fuel. Ozone is proposed for oxidizing sulfur dioxide.Translated from Izmeritelnaya Tekhnika, No. 9, pp. 19–22, September, 2004.     

电导法测定乙酸解离常数实验数据处理软件设计

介绍了用电导法测定乙酸解离常数的实验原理和步骤,给出了用计算机对电导法测定乙酸解离常数的实验数据进行处理的软件设计方法,同时给出了用Visual FoxPro 6.0编写电导法测定乙酸解离常数的处理软件的基本结构和部分程序代码。     

The Influence of Ethanol on the Dye-Surfactant Complex Formation

Abstract

The formation of complexes between an anionic dye and a cationic surfactant was studied with conductometric method. The conductance of dye-surfactant mixtures in aqueous solutions and in solutions with different amount of ethanol was measured at 25°C. The results have shown that the presence of ethanol significantly decreases the formation of complexes. In the presence of 15% or 20% ethanol no interaction which would cause formation of non-conducting or less conducting species between the dye C.I. Acid Orange 7 and the surfactant N-dodecylpyridinium chloride was detected in the observed concentration range.     

疏水改性聚丙烯酰胺的溶解性能研究

采用电导法对一系列疏水改性聚丙烯酰胺的溶解性进行了研究。考虑了疏水基含量,分子量大小,阴离子基团种类及聚合物试样颗粒大小对溶解速度的影响。结果发现,在相同条件下,疏水改性聚丙烯酰胺的溶解时间远远长于聚丙烯酰胺的溶解时间,疏水基含量越高,溶解速度越慢,分子量越高,溶解速度越慢;聚合物颗粒越大,溶解速度越慢。实验结果实证了采用电导法研究疏水缔合聚合物溶解性的可行性。     

电导法氨氮自动连续监测仪的设计与研究

介绍一种可在线自动连续测定水体中氨氮的监测仪,该仪器以吸氨试剂电导率与氨氮质量浓度的关系为依据,运用流通式管路设计,可实现氨氮质量浓度与氨氮总量的自动连续监测。经验证,仪器的各项性能指标均能满足《氨氮水质自动监测仪技术要求》(HJ/T101-2003)。     

Complexation studies of some newly synthesized precursors for substituted dibenzo and dibenzodiaza crown ethers

This study represents the synthesis of dibenzo and dibenzodiaza crown ether precursors with various functional groups in good yield by employing four different methods using polar protic and aprotic solvents with high boiling points. Also the complexation abilities of all synthesized ligands with Cu²⁺, Zn²⁺, and Ag⁺ were studied by conductometry; thus the conductometric behavior of Cu(NO₃)₂, ZnCI₂, and AgNO₃ in 80% dioxane–water mixture was investigated in the presence of these ligands. The order of formation constant for complexes of the ligands with Cu²⁺, Zn²⁺, and Ag⁺ ions was found to be: Cu²⁺ > Zn²⁺ > Ag⁺ for the ligands of VI , VII , XI , and XII ; Cu²⁺ > Ag⁺ > Zn²⁺ for the ligands of III and VIII ; and Zn²⁺ > Cu²⁺ > Ag⁺ for the ligands of I , II , IV , V , IX , and X . © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 2497–2501, 2004     

酸性染料与阳离子染料的相互作用--电导率法和紫外可见光谱法的研究

酸性／阳离于染料对酸性染料可染纤维与阳离于染料可染纤维混纺交织制品一浴法染色时易出现因阴阳离于相互作用而引起的沉淀现象，有关这种相互作用的理论研究对实际生产合理选用染料和助剂具有重要的意义。电子率法和紫外可见光光语法的研究结果表明，酸性和阳离于染料基本上按理论摩尔比发生库仑力作用，并形成复合物，酸性染料与隔离型阳离于染料相互作用强烈，酸性染料的硫水越强，与阳离于染料相互作用的程度就越大。