+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Identification of active agents for tetrachloroethylene degradation in Portland cement slurry containing ferrous iron

, : Identification of active agents for tetrachloroethylene degradation in Portland cement slurry containing ferrous iron. Environmental Science & Technology 41(16): 5824-5832

Experimental studies were designed to identify the active agents in Fe(II)-based degradative solidification/stabilization (Fe(II)-DS/S) that are responsible for the degradation of tetra chloroethylene (PCE) as well as the conditions that enhance the formation of these active agents. First, the conditions that lead to maximizing production of the active agents were identified by measuring the ability of various chemical mixtures to degrade PCE. Results showed that Fe(II), Fe(III), and Cl were the elements most closely associated with high degradation rates. In addition to elemental composition, unknown factors associated with the formation of solid phases could also be important in determining the extent of formation of active reducing agents. Second, instrumental analysis techniques (XRD, SEM, SEM-EDS) were used to identify compounds in chemical mixtures that were observed to have high activities for PCE degradation. SEM-EDS analysis indicated that Fe was associated with hexagonal particles, which is the typical shape of several AFm phases in hydrated Portland cement that are composed of calcium, aluminum/iron, hydroxide, and possibly other anions. No Fe-containing solid phases could be identified. Therefore, it appears that AFm phases are the most likely active agents for PCE degradation in mixtures containing Portland cement or its acid extract. Mixtures without cement did not form the same solid phases but were observed to form ferrous hydroxide as a major solid phase.


PMID: 17874793

DOI: 10.1021/es070361f

Other references

Tada, T.; Byrne, R.A.; Schuster, T.; Cuni, R.; Kitabata, H.; Tiroch, K.; Dirninger, A.; Gratze, F.; Kaspar, K.; Zenker, G.; Joner, M.; Schömig, A.; Kastrati, A., 2013: Early vascular healing with rapid breakdown biodegradable polymer sirolimus-eluting versus durable polymer everolimus-eluting stents assessed by optical coherence tomography. Differences in early arterial healing patterns after stent implantation between biodegradable and durable polymer based new generation drug-eluting stents are not well understood. The aim of this study was to compare the healing patterns of a nove...

Fan, C-xin.; Ford, P.W.; Hu, W-ping.; Qin, B-qiang., 2003: Divergence of carbon dioxide fluxes in different trophic areas of Taihu Lake, China. Carbon dioxide partial pressures (pCO2) and CO2 fluxes on air-water interface in different trophic-level areas of Taihu Lake, China, were calculated and corrected using alkalinity, pH, ionic strength, active coefficient, water temperature and wind...

Uchiyama H.; Nakata M.; Morihiro S.; Tanaka R., 1988: Use of personal computer and digitizer for karyotype analysis. A simple software program using personal computer and digitizer for karyotype analysis written by N88-DISK BASIC was listed and its output example was shown (Fig. 1).

Kanamatsu, T.; Tsukada, Y., 1995: Studies on amino acid metabolism in rat brain administered with 13C-glucose by NMR spectroscopy. Journal of Neurochemistry 65(SUPPL ): S59

Mokarian-Tabari, P.; Collins, T.W.; Holmes, J.D.; Morris, M.A., 2011: Cyclical "flipping" of morphology in block copolymer thin films. We studied the kinetics of nanopattern evolution in (polystyrene-b-polyethylene oxide) diblock copolymer thin films. Using scanning force microscopy, a highly unexpected cylindrical flipping of morphology from normal to parallel to the film plane...

Rupasinghe, H.P.V.; Jackson, C.J.C.; Poysa, V.; Kinjo, J., 2004: A rapid method to analyze saponin precursors in soybean (Glycine max (L.) Merrill). A rapid and efficient analytical method was developed to distinguish and to quantify two major saponin precursors in soyabeans; soyasapogenol A, contributing to the undesirable sensory characteristics, and soyasapogenol B, representing group B and...

Shikishima, Bunji, 1959: Study on the extracellular connective tissue elements in the extra-ocular membrane. Changes in corneal content of hexosamine and hydroxyproline caused by alkali- and acid-burns to the cornea were analyzed biochemically.

Gu, Y-quan.; Zhang, J.; Qi, L-xing.; Yu, H-xi.; Li, J-xin.; Li, X-feng.; Guo, L-rui.; Luo, T.; Cui, S-jun.; Wang, Z-gao., 2007: Surgical treatment of 82 patients with diabetic lower limb ischemia by distal arterial bypass. Background Diabetic lower limb ischemia is a serious complication of diabetes mellitus. This study was conducted to investigate the effectiveness of distal arterial bypass treatment in diabetic patients with lower limb ischemia.Methods From July...

Dexter, RW., 1974: Unusually large numbers of chimney swifts at a nest. Bird-Banding, 454: 365

Chotirmall, S.H.; McElvaney, N.G., 2015: Fungi in the cystic fibrosis lung: bystanders or pathogens?. Improvement to the life expectancy of people with cystic fibrosis (PWCF) brings about novel challenges including the need for evaluation of the role of fungi in the cystic fibrosis (CF) lung. To determine if such organisms represent bystanders or...