نتایج جستجو برای: thms
تعداد نتایج: 398 فیلتر نتایج به سال:
The effects of ozonation on the formation potential of typical disinfection byproducts (DBPs) and the changes of genotoxicity during post chlorination of tertiary effluent from a sewage treatment plant were investigated. Ozonation enhanced the yields of all detected chlorine DBPs except CHCl3. At a chlorine dose of 5 mg/L, the three brominated THMs and five HAAs increased, while chloroform decr...
The characteristics of dissolved organic matter (DOM) and bromide ion concentration have a significant influence on the formation of disinfection by-products (DBPs). In order to identify the main DBP precursors, DOM was divided into five fractions based on molecular weight (MW), trihalomethane formation potential and haloacetic acid formation potential were determined for fractions, and the cha...
A new single-drop microextraction approach is proposed for the extraction of compounds with a wide range of volatilities from tap water samples with separation/detection by gas chromatographymass spectrometry. This new microextraction mode is called direct immersion-headspace-single drop microextraction (DI-HS-SDME). Trihalomethanes (THMs), hydrocarbons with low molecular weight (benzene, ethyl...
Abstract Introduction: Among disinfection by products, trihalomethanes (THMs) are known as the main carcinogen compounds that it’s the major precursor is humic compounds. The aim of this study was to investigate the removal of humic compounds using Al+3 and Fe+3 compounds from Shahrchay river water.in Urmia city. Methods: This study was done experimental. Experiments perform in ...
Chemical disinfection of water supplies brings significant public health benefits by reducing microbial contamination. The process can however, result in the formation of toxic compounds through interactions between disinfectants and organic material in the source water. These new compounds are termed disinfection by-products (DBPs). The most common are the trihalomethanes (THMs) such as trichl...
A total of 60 products of traditional herbal medicine (THM) in various dosage forms of herbal preparation were analyzed to determine selected trace elements (i.e., Zn, Mn, Cu, Cd, and Se) using ICP-MS. Thirty types of both Chinese and Malay THMs were chosen to represent each population. The closed vessel acid microwave digestion method, using CEM MARS 5, was employed for the extraction of the s...
Th is paper describes how a compet i t i ve tree learning a lgo r i t hm can be derived f r o m f i rst pr inciples. The a lgo r i t hm approximates the Bayesian decision theoret ic so lut ion to the learning task. Compara t ive exper iments w i t h the a lgo r i t hm and the several matu re AI and stat is t ica l famil ies of tree learning a lgor i thms cur rent ly in use show the der ived Bay...
There appears to be very good epidemiological evidence for a relationship between chlorination by-products, as measured by trihalomethanes (THMs), in drinking water and bladder cancer, but the evidence for other cancers, including colorectal cancer appears to be inconclusive and inconsistent. There appears to be some evidence for a relationship between chlorination by-products, as measured by T...
G r i f f i t h s and Pet.rick (1965) propose several algori thms for recognizing sentences of contex t f ree grammars in the general case One of these algor i thms, the NBT (Non-select ive Bottom to Top) Algor i thm, has since been ca l led a " l e f t c o r n e r " algor i thm. Of l a te , i n te res t has been rekindled in l e f t co rne r parsers. Chester (1980) proposes a modi f ica t ion ...
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