Sorption characteristics and performance of an acid dye on a gel-type weak anion exchanger in a finite bath

2006 ◽  
Vol 86 (14) ◽  
pp. 2318-2326 ◽  
Author(s):  
Rosa B Cabrera ◽  
Hector M Fernandez-Lahore
Keyword(s):  
Anion Exchanger ◽  
Acid Dye ◽  
Weak Anion Exchanger ◽  
And Performance ◽  
Sorption Characteristics

scholarly journals Comparison of analytical methods for Humic Like Substances (HULIS) measurements in atmospheric particles

2009 ◽  
Vol 9 (16) ◽  
pp. 5949-5962 ◽  
Author(s):  
C. Baduel ◽  
D. Voisin ◽  
J. L. Jaffrezo
Keyword(s):  
Anion Exchanger ◽  
Atmospheric Aerosol ◽  
Chemical Structure ◽  
Isolation Procedure ◽  
Visible Spectroscopy ◽  
Alpine Valley ◽  
Weak Anion Exchanger ◽  
Uv Visible ◽  
Winter Time ◽  
Comparison Of Analytical Methods

Abstract. Humic-Like Substances (HULIS) are a major contributor to the organic carbon in atmospheric aerosol. It would be necessary to standardize an analytical method that could be easily and routinely used for HULIS measurements. We present one of the first comparisons of two of the main methods in use to extract HULIS, using I) a weak anion exchanger (DEAE) and II) the combination of two separation steps, one according to polarity (on C18) and the second according to acidity (with a strong anion exchanger SAX). The quantification is performed with a TOC analyzer, complemented by an investigation of the chemical structure of the extracted fractions by UV-Visible spectroscopy. The analytical performances of each method are determined and compared for humic substances standards. These methods are further applied to determine the water extractable HULIS (HULISWS) and the 0.1 M NaOH alkaline extractable HULIS (HULIS T) in atmospheric aerosol collected in an Alpine Valley during winter time. This comparison, although on a limited batch of samples shows that the simpler DEAE isolation procedure leads to higher recoveries and better reproducibility than the C18-SAX procedure, and might therefore be preferable.

scholarly journals Comparison of analytical methods for HULIS measurements in atmospheric particles

2009 ◽  
Vol 9 (2) ◽  
pp. 6787-6825
Author(s):  
C. Baduel ◽  
D. Voisin ◽  
J. L. Jaffrezo
Keyword(s):  
Anion Exchanger ◽  
Atmospheric Aerosol ◽  
Chemical Structure ◽  
Isolation Procedure ◽  
Visible Spectroscopy ◽  
Alpine Valley ◽  
Weak Anion Exchanger ◽  
Uv Visible ◽  
Winter Time ◽  
Comparison Of Analytical Methods

Abstract. Humic-Like Substances (HULIS) are a major contributor to the organic carbon in atmospheric aerosol. It would be necessary to standardise an analytical method that could be easily and routinely used for HULIS measurements. We present one of the first comparisons of two of the main methods in use to extract HULIS, using i) a weak anion exchanger (DEAE) and ii) the combination of two separation steps, one according to polarity (on C18) and the second according to acidity (with a strong anion exchanger SAX). The quantification is performed with a DOC analyzer, complemented by an investigation of the chemical structure of the extracted fractions by UV-Visible spectroscopy. The analytical performances of each method are determined and compared for humic substances standards. These methods are further applied to determine the water extractable HULIS (HULISWS) and the 0.1M NaOH alkaline extractable HULIS (HULIST) in atmospheric aerosol collected in an Alpine Valley during winter time. This comparison shows that the simpler DEAE isolation procedure leads to higher recoveries and better reproducibility and should therefore be recommended.

Chromatogaphy of Crystalline Taka-Amylase a on a Weak Anion Exchanger

1959 ◽  
Vol 46 (1) ◽  
pp. 93-95
Author(s):  
Akira Tsugita ◽  
Masayori Inoue ◽  
Shiro Akabori
Keyword(s):  
Anion Exchanger ◽  
Weak Anion Exchanger
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