Chlorinated volatile organic compounds (Cl-VOCs) in environment - sources, potential human health impacts, and current remediation technologies.

Wastewater treatment using hybrid treatment schemes based on cavitation and Fenton chemistry: A review

Synthetic endocrine disruptors in the environment and water remediation by advanced oxidation processes.

High molecular weight (106–3 × 107 Da) polyacrylamide (PAM) is commonly used as a flocculant in water and wastewater treatment, as a soil conditioner, and as a viscosity modifier and friction reducer in both enhanced oil recovery and high volume hydraulic fracturing. These applications of PAM can result in significant environmental challenges, both in water management and in contamination of local water supplies after accidental spills. This paper provides a short review of current applications of high molecular weight PAM, including the potential for PAM degradation by chemical, mechanical, thermal, photolytic, and biological processes. Methods for treating wastewater containing partially degraded PAM are then discussed along with issues related to the potential toxicity and mobility of PAM in the environment after disposal or accidental release.

/pdf/polyacrylamide-degradation-and-its-implications-in-49zxgs8ts6.pdf

Polyacrylamide degradation and its implications in environmental systems

Environmental impact of phthalic acid esters and their removal from water and sediments by different technologies--a review.

Oxidative degradation of diethyl phthalate by photochemically-enhanced Fenton reaction.

Adsorption of methomyl on marine sediments

[1] The distribution, photoproduction, and sea-to-air flux of carbon monoxide (CO) were investigated in the East China Sea (ECS) and the Yellow Sea (YS) during April–May 2009. The concentrations of CO in the surface seawater ranged from 0.12 to 6.99 nmol L−1, with a mean of 2.24 nmol L−1. Concentrations of CO showed pronounced diurnal variations within the euphotic zone with early afternoon or noon maxima 5–40 fold that of the predawn minima. The sea-to-air flux of CO was significantly correlated with the supersaturation factor of CO and wind speeds. The sea surface was a net source of atmospheric CO, and the supersaturation factors of CO varied from 1.1–50.4 with an average of 16.0. On the basis of the concentration of CO in the atmosphere and sea surface, wind speeds, and gas exchange, the calculated mean flux of CO from the ECS and the YS to the atmosphere was 6.67 ± 4.61 μmol m−2 d−1. Using Simple Model of the Atmospheric Radiative Transfer of Sunshine spectral irradiance and chromophoric dissolved organic matter (CDOM) based apparent quantum yield of CO (AQYCO) spectrum, the estimate of CO production from CDOM of the ECS and the YS was 64.5 Gg CO-C in spring. The total photomineralization dissolved organic carbon in the ECS and the YS was estimated to be 5.4–10.5 Tg C yr−1, representing 2.9–5.7% of the primary production in the two seas. Our results indicate that CO cycling in coastal areas was significant to the global carbon cycle.

https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2010JC006300

Distribution, flux, and photoproduction of carbon monoxide in the East China Sea and Yellow Sea in spring

Surface seawater samples were collected in the Jiaozhou Bay, a typical semi-closed basin located at the western part of the Shandong Peninsula, China, during four cruises. Concentrations of monosaccharides (MCHO), polysaccharides (PCHO) and total dissolved carbohydrates (TCHO) were measured with the 2,4,6-tripyridyl- s -triazine spectroscopic method. Concentrations of TCHO varied from 10.8 to 276.1 μM C for all samples and the ratios of TCHO to dissolved organic carbon (DOC) ranged from 1.1 to 67.9% with an average of 10.1%. This result indicated that dissolved carbohydrates were an important constituent of DOC in the surface seawater of the Jiaozhou Bay. In all samples, the concentrations of MCHO ranged from 2.9 to 65.9 μM C, comprising 46.1 ± 16.6% of TCHO on average, while PCHO ranged from 0.3 to 210.2 μM C, comprising 53.9 ± 16.6% of TCHO on average. As a major part of dissolved carbohydrates, the concentrations of PCHO were higher than those of MCHO. MCHO and PCHO accumulated in January and July, with minimum average concentration in April. The seasonal variation in the ratios of TCHO to DOC was related to water temperature, with high values in January and low values in July and October. The concentrations of dissolved carbohydrates displayed a decreasing trend from the coastal to the central areas. Negative correlations between concentrations of TCHO and salinity in July suggested that riverine input around the Jiaozhou Bay had an important effect on the concentrations of dissolved carbohydrates in surface seawater. The pattern of distributions of MCHO and PCHO reported in this study added to the global picture of dissolved carbohydrates distribution.

Xiao-Lan Lu

Papers

Oxidative degradation of diethyl phthalate by photochemically-enhanced Fenton reaction.

Adsorption of methomyl on marine sediments

Distribution, flux, and photoproduction of carbon monoxide in the East China Sea and Yellow Sea in spring

Distributions and seasonal variations of dissolved carbohydrates in the Jiaozhou Bay, China.

Distributions and sea-to-air fluxes of volatile halocarbons in the East China Sea in early winter.