Study of Residual Particle Concentrations Generated by the Ultrasonic Nebulization of Deionized Water Stored in Different Container Types

详细信息    查看全文

• 作者：Mark Knight and Giuseppe A. Petrucci
• 刊名：Analytical Chemistry
• 出版年：2003
• 出版时间：September 1, 2003
• 年：2003
• 卷：75
• 期：17
• 页码：4486 - 4492
• 全文大小：114K
• 年卷期：v.75,no.17(September 1, 2003)
• ISSN：1520-6882

文摘

A scanning mobility particle sizer has been used toquantify residual particle number and mass concentrations generated by ultrasonic nebulization of deionized(DI) water stored in a variety of bottles. High variabilityof residual particles was found not only between differentbottle types but also between different bottles of the sametype. Degradation of the water quality, quantified asincreased residual mass and number concentrations asa function of time, occurred to varying degrees for waterstored in different bottle types. Overall, glass bottlesshowed the highest residual particle concentrations andexhibited the poorest stability over time. After a storageperiod of 3 weeks, DI water stored in Pyrex bottlesshowed average increases in particle mass and numberdensities in the aerosol of over 250% and 60%, respectively. Total dissolved impurity levels in the water increased from 110 to 290 ng mL^-1 over the 3-week period.It is hypothesized that leaching from the bottle wallsincreases impurity levels in the water over time. Leachingwas observed for both glass and polymer bottles. Contraryto this trend, residual particle concentrations from deionized water stored in Teflon bottles showed a net decreaseduring the measurement period. With respect to absoluteresidual particle concentrations and storage stability, aTeflon bottle yielded the best performance. Total residualparticle mass and number densities for Teflon were lessthan a factor of 15% and 1%, respectively, as comparedto residual particle levels observed for the Pyrex bottle.Absolute dissolved impurity levels in the water for theTeflon bottle decreased from 7.8 to 3.7 ng mL^-1 over the4-week period.