Abstract
Using the conventional XAD 8/4 method with general columns to isolate dissolved organic matter (DOM) is extremely time-consuming and labor-intensive. This study presents a rapid and effective method using solid-phase extraction (SPE) cartridges packed with XAD 8/4 resins for isolating various DOMs. The relative fraction (percentage hydrophobic, transphilic, and hydrophilic) of the various DOMs processed by both methods showed similar values. Moreover, changes in the molecular weight distribution of effluent from XAD 8/4 resins processed by both methods showed the same ultraviolet (UV) and fluorescence absorbance pattern s. The biopolymer compositions of eluates from XAD 8/4 resins also showed no significant difference between the two methods. However, higher carbon recovery of the isolation method using SPE cartridges was found (with columns: 88.9%; with SPE: 95.9%). In addition, the proposed method using SPE cartridges packed with XAD 8/4 resins is much faster than that using general columns (with columns: 1468 min; with SPE: 485 min). The proposed isolation method is highly efficient and accurate; it is an excellent candidate method for isolating various DOMs.
Highlights
Interest in drinking water analysis for natural organic matter (NOM), which is of health and aesthetic concern, has rapidly increased [1]
NOM, which exists in ground and surface water, consists of complex and heterogeneous compounds composed of humic substances, carbohydrates, proteins, and others at levels of parts per million [2,3]
An isolation method for organic matter using solide-phase extraction (SPE) cartridges packed with XAD 8/4 resins was developed in comparison with an isolation method using general columns filled with XAD 8/4 resins in this study
Summary
Interest in drinking water analysis for natural organic matter (NOM), which is of health and aesthetic concern, has rapidly increased [1]. 8/4 resins have been used to isolate organic solutes from water [5,6,7]. The properties of XAD 8/4 resins are well understood, and extensive studies have been conducted to evaluate resin performance in the isolation and recovery of organic matters from water [8,9,10]. The combined isolation method for dissolved organic matter (DOM) with XAD 8/4 resins has been extensively used in water chemistry research. It has been established that the so-called hydrophobic (HPO) fraction of DOM adsorbs onto the XAD 8 resin from water samples and can be eluted from the resin using 0.1 N NaOH solution
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