Effect of solvent properties on the dispersion coefficient in an on-line microwave flow-injection system

✍ Scribed by Xingguo Chen; Yanjun Xu; Zhide Hu

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 451 KB
• Volume: 314
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(95)00268-5

✦ Synopsis

The dispersion behaviour of solutes (samples and reagents) is influenced by the physical properties and structural parameters of solvents used as carrier streams in a flow-injection system. Chromogenic reagents as indicators, such as

solvents as carrier steams, such as methanol, ethanol, propan-l-01, propan-2-01, butan-l-01 and pentan-l-01, and a laboratory-made microwave flow-injection analyzer were used to explore the relationship between the dispersion coefficient D of solutes and the properties of solvents in an on-line microwave flow-injection system. When the microwave heating time t, was fixed, the relation between the dispersion coefficient D of the four chromogenic reagents in the flow system and molar volume, boiling point, molecular connectivity index, expanded solubility parameter and viscosity were found to have the following general relationship D = a + bP, where a and b were constants whose values varied with the parameter examined (P), the particular chromogenic reagents and the microwave heating time. In addition, we calculated the viscosity of methanol at 30°C on the basis of the above relations and no significant difference. was shown between this value and that determined by a viscosimeter. This indicated that it is possible to calculate some properties of solvents by measuring the dispersion coefficient D of solutes iu a flow-injection system.