121st General Meeting of the KCS

Type Poster Presentation
Area Analytical Chemistry
Room No. Event Hall
Time 4월 19일 (목요일) 11:00~12:30
Code ANAL.P-250
Subject Determination of water content in aprotic organic solvents based on the 1H NMR chemical shifts differences between water and solvent peaks
Authors Jeongbin Yoon, Suk Kyu Chang, Byungjoo Kim1, Kihwan Choi2, Sangdoo Ahn*
Department of Chemistry, Chung-Ang University, Korea
1Metrology for Quality of Life, Korea Research Institute of Standards and Science, Korea
2Center for Organic Analysis, Korea Research Institute of Standards and Science, Korea
Abstract A simple and convenient method to determine the water content in aprotic organic solvents using the 1H NMR chemical shifts differences between water and solvent has been developed. There was a linear relation between the chemical shifts difference and the water content in various organic solvents, thereby enabling a simple measurement of the water content in organic solvents. Since the chemical shifts differences values between intrinsic water and solvent proton peaks were used for the measurements, hence no additional reagent was needed. Therefore, the method became much simpler and applicable to a wide range of organic solvents and magnetic fields. This method was validated by a comparison with the conventional Karl Fischer titration and the integral method of qNMR. The temperature effects were also investigated at the temperature values around room temperature, and a correction factor was calculated to expand the versatility of the linear relation even at different temperatures. It has been proposed here that the chemical shift changes of water protons relative to those of solvent protons could be used to effectively assess the residual water content in aprotic organic solvents.
E-mail gjbyoon@gmail.com