Contamination river sediment

Kristiansson E, Pick J, Janzon A et al (2011) Pyrosequencing of antibiotic-contaminated river sediments reveals high levels of resistance and gene transfer elements. PLoS One 6(2) el7038... 

Quality Assurance/Quality Control. QA/QC measures included field blanks, solvent blanks, method blanks, matrix spikes, and surrogates. Percent recovery was determined using three surrogate compounds (nitrobenzene-d5, 2-fluorobiphenyl, d-terphenyl-diQ and matrix spikes (naphthalene, pyrene, benzo[ghi]perylene) the recoveries ranged from 80 to 102%. Separate calibration models were built for each of the 16 PAHs using internal standards (naphthalene-dg, phenanthrene-dio, perylene-di2). Validation was performed using a contaminated river sediment (SRM 1944) obtained from NIST (Gaithersburg, MD) accuracy was <20% for each of the 16 analytes. 

By coupling flow field-flow fractionation (flow FFF) to ICP-MS it is possible to investigate trace metals bound to various size fractions of colloidal and particulate materials.55 This technique is employed for environmental applications,55-57 for example to study trace metals associated with sediments. FFF-ICP-MS is an ideal technique for obtaining information on particle size distribution and depth profiles in sediment cores in addition to the metal concentrations (e.g., of Cu, Fe, Mn, Pb, Sr, Ti and Zn with core depths ranging from 0-40 cm).55 Contaminated river sediments at various depths have been investigated by a combination of selective extraction and FFF-ICP-MS as described by Siripinyanond et al,55... 

Klarup, D.G. (1997) The influence of oxalic acid on release rates of metals from contaminated river sediment. Science of the Total Environment, 204(3), 223-31. 

Potential new applications of SFE include the hy-drometallurgical extraction of gold and the remediation of contaminated river sediments. 

Helgen, S. O., and Moore, 1. N., 1996, Natural background determination and impact quantification in trace metal-contaminated river sediments Environmental Science Technology, v. 30, no. 1, p. 129-135. 

Indoor air concentrations of PCBs in 34 homes near New Bedford Harbor, Massachusetts were measured between April 1994 and April 1995 during the dredging of contaminated river sediments. PCB levels in indoor air samples ranged from 7.9 to 61 ng/m in homes closest to the dredging operation compared to more distant houses which had levels ranging from 5.2 to 51 ng/m (Vorhees et al. 1997). However, these indoor concentrations exceeded outdoor concentrations by an average ratio of 32, indicating the importance of indoor air concentrations to human exposures. House dust was also analyzed for PCB... 

Chlorinated and Brominated Organic Pollutants in Contaminated River Sediments 23... 

Figure 10.12 gives the scheme of a pilot plant, which has been designed by the Environmental Research Centre at Leipzig. With this technique, contaminated river sediments should be treated and decontaminated to an extent, that they can... 

Tsai et al. have adopted the microwave activation of electrochemical processes and have employed it to improve the analytical detection of Pb [52,53]. The combination of microwave enhancement and boron-doped diamond electrode material has been introduced and explored for analytical procedures recently [49-54]. It was discovered that both the deposition of Pb metal at negative potential followed by anodic stripping, and the deposition of Pb02 at positive potential followed by cathodic stripping are enhanced in the presence of microwave activation. This exploratory work is extended here in order to develop a novel electroanalytical technique for the analysis of Pb. The new technique was applied to determine the Pb content in a contaminated river sediment sample. 

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