Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 441329
Title Simultaneous analysis of small organic acids and humic acids using high performance size exclusion chromatography
Author(s) Qin, X.P.; Liu, F.; Wang, G.C.; Weng, L.P.
Source Journal of Separation Science 35 (2012)24. - ISSN 1615-9306 - p. 3455 - 3460.
DOI https://doi.org/10.1002/jssc.201200414
Department(s) Soil Chemistry and Chemical Soil Quality
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) spectroscopic properties - molecular-weight - iron-oxide - adsorption - substances - goethite - matter - water - polydispersity - complexation
Abstract An accurate and fast method for simultaneous determination of small organic acids and much larger humic acids was developed using high performance size exclusion chromatography. Two small organic acids, i.e. salicylic acid and 2,3-dihydroxybenzoic acid, and one purified humic acid material were used in this study. Under the experimental conditions, the UV peaks of salicylic acid and 2,3-dihydroxybenzoic acid were well separated from the peaks of humic acid in the chromatogram. Concentrations of the two small organic acids could be accurately determined from their peak areas. The concentration of humic acid in the mixture could then be derived from mass balance calculations. The measured results agreed well with the nominal concentrations. The detection limits are 0.05 mg/L and 0.01 mg/L for salicylic acid and 2,3-dihydroxybenzoic acid, respectively. Applicability of the method to natural samples was tested using groundwater, glacier, and river water samples (both original and spiked with salicylic acid and 2,3-dihydroxybenzoic acid) with a total organic carbon concentration ranging from 2.1 to 179.5 mg C/L. The results obtained are promising, especially for groundwater samples and river water samples with a total organic carbon concentration below 9 mg C/L.
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