Predicting the capacity of powdered activated carbon for trace organic compounds in natural waters

Article Abstract:

A simple method was developed to predict the powdered activated carbon (PAC) capacity for trace organic compounds, such as the herbicide atrazine and the odor-causing compound 2-methyl-isoborneolin, natural water. Results revealed that the PAC capacity for the micropollutants in multi-solute systems is directly proportional to the initial micropollutant concentration. Estimating PAC dose to remove micropollutants from natural waters would not need mathematical models from a single isotherm if the initial target compound concentration is low.

Analysis, Water, Activated carbon, Atrazine, Water analysis, Carbon, Activated

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Occurrence and transformation reactions of chiral and achiral phenoxyalkanoic acid herbicides in lakes and rivers in Switzerland

Article Abstract:

Chiral 2-(4-chloro-2-methylphenoxy)propionic acid (mecoprop, MCPP) and the achiral 4-chloro-2-methylphenoxyacetic acid (MCPA), 2,4-dichlorophenoxyacetic acid (2,4-D) and a benzoic acid derivative, dicamba, are the compounds often detected in lakes and rivers in Switzerland. Most compounds, except for small traces of dichlorprop, DCPP, can not be detected in mountain lakes. Concentrations of the herbicide compounds remain below the ECE recommended drinking water tolerance level of 100 ng/L.

Switzerland

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Metabolites of alachlor in water: identification bymass spectrometry and chemical synthesis

Article Abstract:

The biodegradation products the herbicide, alachlor, were examined. The dissolved alachlor in river water yielded several metabolites including chloroacetic acid and 2,6-diethylaniline (DEA). The metabolites can be as toxic as their parent compound, alachlor, because they have lower molecular weight and more oxidized than alachlor. These properties makes the metabolites more water soluble, more mobile and more capable to leach.

Administration of Air and Water Resource and Solid Waste Management Programs, Water Pollution Control, Alachlor

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