M.V. Lomonosov Moscow State University, Chemistry Department, Leninskie Hills 1/3, 119991, GSP-1, Moscow, Russia.
M.V. Lomonosov Moscow State University, Chemistry Department, Leninskie Hills 1/3, 119991, GSP-1, Moscow, Russia; University of Washington, Department of Bioengineering, Seattle, WA, 98195, USA.
Anal Chim Acta. 2017 Feb 8;953:57-62. doi: 10.1016/j.aca.2016.11.037. Epub 2016 Nov 26.
The optoacoustic (OA) technique capable for light-absorption measurements in highly concentrated solutions is applied for direct solubility assessment in highly absorbing saturated solutions without any dilution or sample preparation. Maximum solubility of Phenol Red in aqueous solutions at pH>11 is found to be 1.3±0.1 g/L. The experimental dependence of solubility of Phenol Red on solution acidity was obtained with optoacoustic and conventional spectrophotometric measurements. The data from both methods show complementary results. The model of the solubility of Phenol Red on solution acidity describing the experimental dependence is proposed, which cannot be attained at pHs above 7 without the OA-technique.
该光声（OA）技术可用于测量高浓度溶液中的光吸收，无需稀释或样品制备即可直接评估高吸收饱和溶液中的溶解度。在 pH>11 的水溶液中，发现苯酚红的最大溶解度为 1.3±0.1 g/L。通过光声和常规分光光度法测量获得了苯酚红溶解度随溶液酸度的实验关系。两种方法的数据均显示出互补的结果。提出了一个描述实验关系的苯酚红溶解度随溶液酸度变化的模型，在 pH 值高于 7 时，如果没有 OA 技术，该模型无法得到。
