Analysis of structurally modified polyacrylamides by on-line thermochemolysis-GC–MS |
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| Institution: | 1. State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China;2. Department of Chemistry, Lanzhou University, Lanzhou 730000, China;3. College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;1. Center for Resources and Environmental Research, Beijing University of Chemical Technology, Beijing 100029, China;2. Beijing Municipal Environmental Monitoring Center, Beijing 100044, China;3. Department of Biological Systems Engineering, Washington State University at Pullman, WA 99164-6120, USA;1. Department of pharmacy and Guangdong Province Key Laboratory of Pharmacodynamic of Traditional Chinese Medicine & New Drug Research, Jinan University, Guangzhou 510632, China;2. Laboratory of Analytical Pharmaceutical Chemistry, Department of Pharmaceutical Sciences, University of Liege, CHU B36, Liege B-4000, Belgium;1. Department of Forensic Sciences, George Washington University, Washington, DC, United States;2. Department of Chemistry, United States Naval Academy, Annapolis, MD, United States;1. Division of Metabolomics, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan;2. Vrije Universiteit Brussel, Department of Chemical Engineering, Pleinlaan 2, B-1050, Brussels, Belgium |
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| Abstract: | Cationically modified polyacrylamides (cPAA) are commonly used flocculants in sewage water treatment processes. Therefore, those compounds are quantitatively important contaminants in sewage sludges, which were deposited on agricultural soils as fertilizers in the past and even today in many countries. In order to monitor environmental pathways and to correlate ecotoxicological effects with quantitative data, there is a necessity for methodologies for quantitative analyzes of technically applied polyacrylamides. The present investigation provides a fundamental proof of the verifiability of cPAA in particulate samples by on-line thermochemolysis-GC–MS in presence of tetramethyl ammonium hydroxide. This methodological approach induces degradation of cPAA to glutarimide related structures. Experiments were carried out on pure cPAA, spiked sediments and sewage sludges. The results revealed a linear correlation between thermochemically degraded quantities of cPAA and abundances of glutarimide related degradation products as well as a theoretical limit of detection of 250 mg/kg, which is sufficient for corresponding analyzes concerning sewage sludges. Thermochemolysis experiments on polyacrylamide and anionically modified derivates revealed the same glutarimide related degradation products as obtained by degradation of cPAA. |
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