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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Relevance of nonfunctional linear polyacrylic acid for the biodegradation of superabsorbent polymer in soils.
Environ. Sci. Pollut. Res. 22, 5444-5452 (2015)
Biodegradability is a desired characteristic for synthetic soil amendments. Cross-linked polyacrylic acid (PAA) is a synthetic superabsorbent used to increase the water availability for plant growth in soils. About 4 % within products of cross-linked PAA remains as linear polyacrylic acid (PAAlinear). PAAlinear has no superabsorbent function but may contribute to the apparent biodegradation of the overall product. This is the first study that shows specifically the biodegradation of PAAlinear in agricultural soil. Two 13C-labeled PAAlinear of the average molecular weights of 530, 400, and 219,500 g mol−1 were incubated in soil. Mineralization of PAAlinear was measured directly as the 13CO2 efflux from incubation vessels using an automatic system, which is based on 13C-sensitive wavelength-scanned cavity ring-down spectroscopy. After 149 days, the PAAlinear with the larger average molecular weight and chain length showed about half of the degradation (0.91 % of the initial weight) of the smaller PAAlinear (1.85 %). The difference in biodegradation was confirmed by the δ13C signature of the microbial biomass (δ13Cmic), which was significantly enriched in the samples with short PAAlinear (−13 ‰ against reference Vienna Pee Dee Belemnite,VPDB) as compared to those with long PAAlinear (−16 ‰ VPDB). In agreement with other polymer studies, the results suggest that the biodegradation of PAAlinear in soil is determined by the average molecular weight and occurs mainly at terminal sites. Most importantly, the study outlines that the size of PAA that escapes cross-linking can have a significant impact on the overall biodegradability of a PAA-based superabsorbent.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Schlagwörter
Polymer mineralization; Polyacrylate; Water superabsorbent polymer (SAP); 13CO2 efflux; Microbial Biomass-c; Degradation; Extraction; Growth; Model; Trees; Wheat; Water
ISSN (print) / ISBN
0944-1344
e-ISSN
1614-7499
Zeitschrift
Environmental Science and Pollution Research
Quellenangaben
Band: 22,
Heft: 7,
Seiten: 5444-5452
Verlag
Springer
Verlagsort
Heidelberg
Nichtpatentliteratur
Publikationen
Begutachtungsstatus
Peer reviewed