The potential hazards and risks associated with well-stimulation in unconventional oil and gas development (hydraulic fracturing, acid fracturing, and matrix acidizing) have been investigated and evaluated and federal and state regulations requiring chemical disclosure for well-stimulation have been implemented as part of an overall risk management strategy for unconventional oil and gas develo...

enzymatic deinking has been suggested as an environmentally friendly alternative to complement and replace for conventional chemical deinking. in the present research, the effect of hemicellulase from aspergillus niger has been evaluated on paper quality of mixed 70% old newspaper (onp) and 30% old magazine (omg) pulp. hemicellulose was used at different charges of 0.1 (h1), 0.2 (h2), 0.5 (h3) ...

Polycyclic aromatic hydrocarbons (PAHs) are a class of chemical substances consisting carbon and hydrogen only, which have multiple fused ring systems. Although PAHs widely recognised as contaminants concern (CoC), no applicable limits been established for groundwater in the Romanian legislation. Furthermore, existing methodologies do not include guidelines assessing human exposure to contamina...

Abstract The use of water resources from hand-dug wells, boreholes and streams around cassava processing mills within Ilaro metropolis, Ogun State Nigeria for domestic industrial activities had led to the assessments in vicinities Ekueme, Olorungbogo, Double Crown, Olalandu Akewe mills. Eleven samples were collected taken laboratories physiochemical, heavy metals microbial analyses. values obta...

Here we evaluate the excess lifetime cancer risk (ELCR) posed by 10 PAH-contaminated soils using (i) the currently advocated, targeted chemical-specific approach that assumes dose additivity for carcinogenic PAHs and (ii) a bioassay-based approach that employs the in vitro mutagenic activity of the soil fractions to determine levels of benzo[a]pyrene equivalents and, by extension, ELCR. Mutagen...

Current occupational exposures to chemical agents were assessed as part of an epidemiological study pertaining to the cancer and mortality patterns of Ontario construction workers. The task-based exposure assessment involved members from nine construction trade unions. Air samples were taken using personal sampling pumps and collection media. A DustTrak direct-reading particulate monitor was al...

1117 AUGUST 2005 AMERICAN METEOROLOGICAL SOCIETY | he decreasing levels of halogens in the stratosphere should lead to a gradual recovery from the chemical ozone depletion that has occurred over the past decades (WMO 2003). However, climate change resulting from increases in greenhouse gas concentrations will infl uence the stratosphere through a range of radiative, dynamical, and chemical mech...

Biodegradation of the polycyclic aromatic hydrocarbons of creosote by undefined bacterial cultures was shown to be accompanied by the accumulation of neutral and acidic oxidation products. Formation of a number of identified neutral products is accounted for by demonstration of anomalous actions of an arene dioxygenase on the benzylic methylene and methylene carbons of napthenoaromatic hydrocar...