scholarly journals A Passive Sampling Study of Small-Scale Variations in Ambient Acetaldehyde and Formaldehyde Concentrations

2011 ◽  
Vol 4 ◽  
pp. ASWR.S7582 ◽  
Author(s):  
Amanda M. Evans ◽  
Amy L. Stuart
Keyword(s):  
High Performance Liquid Chromatography ◽  
High Performance ◽  
Passive Sampling ◽  
High Spatial Resolution ◽  
Small Scale ◽  
Sampling Area ◽  
Ultraviolet Detection ◽  
Hillsborough County ◽  
Coefficients Of Variation ◽  
Concentration Patterns

Radiello passive diffusive aldehyde samplers were used to measure ambient formaldehyde and acetaldehyde levels, approximately every 0.7 km in a 10 km2 sampling area in Hillsborough County, Florida from January 21 to 28, 2010. Samples were analyzed for aldehyde-DNPH derivatives via high performance liquid chromatography with ultraviolet detection. Concentrations were compared with values at a regulatory fixed-site monitor. Distribution statistics, concentration ratios, and spatial contours were calculated to investigate spatial variability. Mean aldehyde concentrations were 2.4 and 1.1 μg/m3 for formaldehyde and acetaldehyde, respectively. Observed spatial concentration patterns were similar for both aldehydes and suggest the influence of nearby roadway emissions. Overall, the spatial variation was small, with coefficients of variation of 13% and 22%, respectively. Results here provide methods and data for understanding exposures to aldehydes at high spatial resolution.

Determination of sterigmatocystin in beer by high performance liquid chromatography with ultraviolet detection

2008 ◽  
Vol 1 (2) ◽  
pp. 161-166 ◽  
Author(s):  
A. Veršilovskis ◽  
S. De Saeger ◽  
V. Mikelsone
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Solid Phase ◽  
Extraction Procedure ◽  
Reversed Phase ◽  
Ultraviolet Detection ◽  
Coefficients Of Variation ◽  
Solid Phase Extraction Procedure

A new method for the determination of sterigmatocystin in beer was developed. This method consists of a solid phase extraction procedure of light and dark beer and reversed phase high performance liquid chromatography with ultraviolet detection. Recoveries of sterigmatocystin from beer samples spiked at levels from 0.5 to 100 µg/l ranged from 81 to 126% for light beer and from 88 to 126% for dark beer with coefficients of variation between 2.2 and 14%. From the total of 26 analysed Latvian beer samples only two (7.7%) were contaminated with sterigmatocystin.

Determination of fexofenadine in Hank's balanced salt solution by high-performance liquid chromatography with ultraviolet detection: application to Caco-2 cell permeability studies

2014 ◽  
Vol 29 (4) ◽  
pp. 537-544 ◽  
Author(s):  
Marco Antônio dos. Reis Júnior ◽  
Ana Cláudia Miranda de Faria ◽  
Eudes da. Silva Velozo ◽  
Teresa Dalla Costa ◽  
Frank Pereira de Andrade ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Salt Solution ◽  
High Performance ◽  
Cell Permeability ◽  
Ultraviolet Detection ◽  
Permeability Studies
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