光化学法测定氧气在各种介质中的溶解度。
Photochemical determination of the solubility of oxygen in various media.
作者信息
Franco C, Olmsted J
机构信息
Department of Chemistry and Biochemistry, California State University, Fullerton, CA 92634, U.S.A.
出版信息
Talanta. 1990 Sep;37(9):905-9. doi: 10.1016/0039-9140(90)80251-a.
A photochemical method for determining the oxygen concentration in air-saturated non-aqueous solvents has been developed. Solutions containing a sensitizer (Rose Bengal or Methylene Blue) and 1,3-diphenylisobenzofuran (DPIBF) as an oxygen acceptor are irradiated at 546 or 633 nm and the absorbance at 404 nm is monitored. The dissolved oxygen content is found from the change in absorbance and the known 1:1 stoichiometry of addition of singlet oxygen to DPIBF. The solubilities found, accurate to +/- 6%, for oxygen in air-equilibrated solvents, are (mM): acetone, 2.37; acetonitrile, 2.42; dimethylsulfoxide, 0.33; ethanol, 1.94; N-methylformamide, 1.31. Measurements on mixed acetone-N-methylformamide solvents showed that the solubility of oxygen does not vary with solvent composition in a predictable manner.
已开发出一种用于测定空气饱和非水溶剂中氧浓度的光化学方法。含有敏化剂（孟加拉玫瑰红或亚甲蓝）和作为氧受体的1,3 - 二苯基异苯并呋喃（DPIBF）的溶液在546或633nm处进行辐照，并监测404nm处的吸光度。根据吸光度的变化以及单线态氧与DPIBF加成的已知1:1化学计量关系来确定溶解氧含量。对于空气平衡溶剂中的氧，所测得的溶解度（毫摩尔）精确到±6%，分别为：丙酮，2.37；乙腈，2.42；二甲基亚砜，0.33；乙醇，1.94；N - 甲基甲酰胺，1.31。对丙酮 - N - 甲基甲酰胺混合溶剂的测量表明，氧的溶解度不会以可预测的方式随溶剂组成而变化。
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