Study on the Interaction of Dissolved Organic Matter with Lead and Arsenic.

In order to study the interaction of organic matter with arsenic (As) and lead (Pb) in natural water, standard dissolved organic matter (standard DOM) was taken as the research object, and the analysis was carried out by spectroscopy, high-resolution mass spectrometry, parallel factor analysis and other methods. The results showed that compared with fulvic acids and humus, protein-like tyrosines showed higher binding capacity to As and Pb. The results of high-resolution mass spectrometry showed that heavy metals could change the original characteristics of the standard DOM, resulting in the transformation of organic matter, such as the decrease of amino carbohydrate components, the increase of tannin-like components, the decrease of the relative abundance of CHO, and the increase of the relative abundance of other heteroatoms. DOM-As showed that there was a strong positive correlation between the ultraviolet characteristic parameter a254 and the fluorescence characteristic parameter HIX, the amino sugar component and CHO obtained by ultra-high resolution mass spectrometry were positively correlated with the ultraviolet characteristic parameters a254, a260, a280 and the fluorescence characteristic parameter HIX, and the fluorescence component C1 was positively correlated with the unsaturated hydrocarbon component obtained by mass spectrometry. The results of the study may provide theoretical support for the quantitative assessment of the mechanism of organic matter-heavy metal interactions in water bodies, thereby reducing the environmental behavior of various pollutants such as heavy metals. [ABSTRACT FROM AUTHOR]