Determination of the second ionization constant of 3,5-dinitrosalicylic acid (DNSH2) and the instability constant of [DNSFe]+ and titrimetric determination of thiourea with a 3,5-dinitrosalicylate-selective electrode |
| |
| Institution: | 1. Key Lab. for Anisotropy and Texture of Materials, Education Ministry of China, School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, PR China;2. Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester, M13 9PL, England, UK;3. Shenyang Northeastern Institute of Metal Materials Co., Ltd., Shenyang, 110108, PR China;1. College of Textiles, Qingdao University, Qingdao, Shandong 266071, China;2. Laboratory of New Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, Qingdao, Shandong 266071, China;3. Collaborative Innovation Center for Marine Biomass Fibers, Materials and Textiles of Shandong Province, Qingdao University, Qingdao, Shandong 266071, China;1. Los Alamos National Laboratory, Los Alamos, NM, 87545, USA;2. Honeywell FM&T, Kansas City, MO, 64147, USA;1. Research Laboratories in Sciences Applied to Food, Canadian Irradiation Centre (CIC), INRS-Institute Armand-Frappier, University of Quebec, 531 Boulevard des Prairies, Laval, Quebec, Canada H7V 1B7;2. FPInnovations, 570 Boulevard Saint Jean, Pointe-Claire, Quebec, Canada H9R 3J9;3. International Atomic Energy Agency (IAEA), Division of Nuclear Sciences and Applications, Department of Physical and Chemical Sciences, Section of Industrial Applications and Chemistry, Vienna International Centre, POB 100, A-1400, Vienna, Austria |
| |
| Abstract: | Measurements made with a combination of glass and 3,5-dinitrosalicylate-selective membrane electrode in DNSHNa solutions varying in pH and ionic strength have been used to determine the second ionization constant of 3,5-dinitrosalicylic acid. Also the instability constant of the complex DNSFe]+ has been determined by titrating known amounts of iron(III) with standard DNSHNa solution. A method has been developed for the semiautomatic potentiometric titration of thiourea with silver nitrate in the presence of 3,5-dinitrosalicylate ions, using the aforementioned selective electrode. Thiourea in the range 1.5–15 mg was determined with average relative error and relative standard deviation of about 1%. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
