نتایج جستجو برای: 254 and doc removal

تعداد نتایج: 16850949  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده علوم پایه 1392

شاخص های عمده ی کربن محلول در آب عبارتند از tdc(کل کربن محلول)، dic (کربن معدنی محلول) و doc (کربن آلی محلول). منشأ عمده ی کربن محلول موجود در منابع آبی می تواند از جو، گیاه، سنگ و خاک و آلاینده ها باشد. با ریزش های جوی و نفوذ آب در خاک و سنگ ها، dic (از انحلال co2و هوازدگی مواد سیلیکاته و کربناته) وdoc (از انحلال مواد آلی موجود در خاک) وارد منابع آب های سطحی و زیرزمینی می شوند. عوامل مختلف فیز...

2015
Patrycja Siudek Marcin Frankowski Jerzy Siepak

Spatial and temporal variability of carbon species in rainwater (bulk deposition) was studied for the first time at two sites located in urban area of Poznań City and protected woodland area (Jeziory), in central Poland, between April and December 2013. The mean concentration of total carbon (TC) for the first site was 5.86 mg L(-1), whereas for the second, 5.21 mg L(-1). Dissolved organic carb...

2016
Helena Osterholz David L. Kirchman Jutta Niggemann Thorsten Dittmar

Estuaries as connectors of freshwater and marine aquatic systems are hotspots of biogeochemical element cycling. In one of the best studied temperate estuaries, the Delaware Estuary (USA), we investigated the variability of dissolved organic matter (DOM) over five sampling cruises along the salinity gradient in August and November of 3 consecutive years. Dissolved organic carbon (DOC) concentra...

2003
Gitai Yahel Jonathan H. Sharp Dominique Marie Clivia Häse Amatzia Genin

The vast majority of organic matter in the world ocean is found in the dissolved pool. However, no evidence has been demonstrated for direct uptake of bulk dissolved organic matter (DOM) by organisms other than bacteria and some invertebrate larvae. The total organic carbon (TOC) is 10–30% higher in coral reefs than in adjacent open waters. The dissolved organic carbon (DOC) accounts for .90% o...

1994
Dennis A. Hansell Nicholas R. Bates Kjell Gundersen

The lability of dissolved organic carbon was estimated in the Sargasso Sea. Rates of DOC mineralization were estimated by monitoring, with high precision, the accumulation of CO, in dark incubation bottles after the removal of particles > 0.8 pm in size. The minimum incubation time used in these experiments was 24 h. Rates from three 24 h incubations conducted on water from 20 m fell in the nar...

Journal: :E3S web of conferences 2021

The whole research paper examines the impact of ozone as either a just use-alone and coagulation benefit, mainly upon reduction dissolved organic carbon from water with moderate rate DOC 10.75 mg/land CaCO3 calcium hardness 300 mg/l. A raw sample has been taken Tigris River (Baghdad, Iraq) was being adopted in work. performance therapy assessed by calculations DOC, quantities, UV254, well total...

2013
Adrian Stefan Andronache Cristina Rosazza Davide Sattin Matilde Leonardi Ludovico D'Incerti Ludovico Minati

An emerging application of resting-state functional MRI (rs-fMRI) is the study of patients with disorders of consciousness (DoC), where integrity of default-mode network (DMN) activity is associated to the clinical level of preservation of consciousness. Due to the inherent inability to follow verbal instructions, arousal induced by scanning noise and postural pain, these patients tend to exhib...

Journal: :Science of The Total Environment 2021

Afforestation is a significant cause of global peatland degradation. In some regions, afforested bogs are now undergoing clear-felling and restoration, often known as forest-to-bog restoration. We studied differences in water-table depth (WTD) porewater chemistry between intact, afforested, restored at raised bog blanket location. Solute concentrations principal component analysis suggested tha...

ژورنال: طلوع بهداشت یزد 2015
احرامپوش, محمد حسن , انوری, فاطمه , جمشیدی, بهزاد, خیر خواه, منیره , دهواری, محبوبه , عسکری شاهی, محسن, قانعیان, محمدتقی,

Introduction: The most important affect of natural organic matters in water is their reaction with chlorine and producing of disinfection byproducts that are carcinogenic. Humic acid is most common natural organic materials of surface water. Advanced oxidation processes (AOPs) are methods for the removal of organics from aqueous solutions. Application of electron beam radiation is one of these ...

Journal: :Water research 2015
I Zucker H Mamane H Cikurel M Jekel U Hübner D Avisar

The Shafdan reclamation project facility (Tel Aviv, Israel) practices soil aquifer treatment (SAT) of secondary effluent with hydraulic retention times (HRTs) of a few months to a year for unrestricted agricultural irrigation. During the SAT, the high oxygen demand (>40 mg L(-1)) of the infiltrated effluent causes anoxic conditions and mobilization of dissolved manganese from the soil. An addit...

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