نتایج جستجو برای: thms
تعداد نتایج: 398 فیلتر نتایج به سال:
BACKGROUND Trihalomethanes (THMs) and haloacetic acids (HAAs) are regulated disinfection by-products (DBPs); their joint reproductive toxicity in drinking water is unknown. OBJECTIVE We aimed to evaluate a drinking water mixture of the four regulated THMs and five regulated HAAs in a multigenerational reproductive toxicity bioassay. METHODS Sprague-Dawley rats were exposed (parental, F1, an...
BACKGROUND Evidence on the association between colorectal cancer and exposure to disinfection by-products in drinking water is inconsistent. OBJECTIVES We assessed long-term exposure to trihalomethanes (THMs), the most prevalent group of chlorination by-products, to evaluate the association with colorectal cancer. METHODS A multicenter case-control study was conducted in Spain and Italy in ...
Traditional Indian (Ayurvedic) and Chinese herbal medicines have been used in the treatment of a variety of diseases for thousands of years because of their natural origin and lesser side effects. However, the safety and efficacy data (including dose and quality parameters) on most of these traditional medicines are far from sufficient to meet the criteria needed to support their world-wide the...
The presence of trihalomethanes (THMs) in potable-water sources is an issue of great interest because of the negative impact THMs have on human health. The objective of this study was to correlate the presence of trihalomethanes with more routinely monitored parameters of water quality, in order to facilitate THM control. Water samples taken at various stages of treatment from a water treatment...
We obtain n e w entropy and m u t u a l information formulae for regenerative stochastic processes. We use them on Markov channels to generalize the resul ts i n Goldsmi th and Varaiya [3]. Also w e obtain tighter bounds on capaci ty and better algori thms than in [3].
Background & Aims: Humic acid is a major agent in trihalomethanes (THMs) formation during chlorination process, which are known as carcinogens. The aim of this study were to investigate the removal of humic acid by three coagulants including PACl, alum and ferric chloride from water sources and their effect on zeta potencial. Materials & Methods: This study was conducted  ...
BACKGROUND Exposure to disinfection by-products (DBPs) in drinking water has been associated with cancer risk. A recent study (Villanueva et al. 2007; Am J Epidemiol 165:148-156) found an increased bladder cancer risk among subjects attending swimming pools relative to those not attending. OBJECTIVES We evaluated adults who swam in chlorinated pools to determine whether exposure to DBPs in po...
هدف از این پژوهش، توسعه و ارزشیابی استفاده از روش فضای فوقانی در ترکیب با کروماتوگرافی گازی مجهز به آشکارساز رسانایی الکترولیتی برای اندازه‌گیری‌تری هالومتان‌ها (THMs) در آب آشامیدنی است. اثر عامل‌های مؤثر مانند دمای آب، قدرت یونی محیط، زمان هم‌زدن و حجم نمونه بر عملکرد روش بررسی شد. اندازه‌گیری‌ها با استفاده از استاندارد داخلی 1-کلرو-2- بروموپروپان انجام شدند. پاسخ برای تمامی تری‌هالومتان‌ها د...
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