sources of dissolved organic carbon

... 1377–1390.DISSOLVED ORGANIC CARBON AS AN INDICATOR OF THE SCALE OF WATERSHED INFLUENCE ON LAKES AND RIVERSSarah E Gergel,a, b Monica G Turner,a and Timothy K Kratzc a Zoology Department, University of ... of organic matter that enter lakes primarily in dissolved form (Kowalczewski 1978, Wetzel 1990, 1992) This tea-colored DOC is composed of fulvic and humic acids, products of the degradation of ... study quantifies the extent of the landscape influence using the proportion of wetlands in the watershed measured at different distances to predict dissolved organic carbon (DOC) concentrations

Ngày tải lên: 18/10/2022, 22:44

... biodegradability of terrestrial DOM, i.e., the utilisation of organic compounds by soil microorganismsquantified by the disappearance of DOM or O2or by the evolution of CO2 3 Methods for the determination of ... Bioavailability; Biodegradation; Dissolved organic matter; DOC 1 Introduction In the past 10 years, much progress has been made in the understanding of dissolvedorganic matter (DOM) functions and ... effects ofmetals are generally attributed to toxicity of the organic complexes or the free metal ions Incontrast, the enhanced degradability observed in the presence of metal ions may be due toflocculation,

Ngày tải lên: 15/03/2014, 23:22

... fraction of organic carbon on the basis of method mentioned below Organic carbon Organic carbon was determined by wet oxidation method (Walkley and Black, 1935) Soil microbial biomass carbon ... pools of soil organic carbon and yield of groundnut and wheat as compare to unfertilized control and the initial values The addition of NPK with FYM increased active fraction of organic carbon ... continuous cropping and integrated use of organic and inorganic fertilizers increased soil C sequestration and crop yields Organic Carbon (O C.) The organic carbon was significantly affected by

Ngày tải lên: 29/05/2020, 17:36

... fundamental understanding of the stabilization of carbon in soils The reason for this lies in the fact that one of the largest sinks of organic carbon on the global scale is the organic matter stored ... experiments, most of which has focused on labile carbon with short turnover times But the majority of total soil carbon stocks are comprised of organic carbon with turnover times of decades to centuries ... stabilization of decomposed organic matter is more than that of fresh organic matter They studied the mineralization rate of fresh maize solution, organic matter extracted from Oi layer of soil and organic

Ngày tải lên: 27/09/2020, 13:22

... the formation of suspected carcinogenic disinfection by-products (DBPs), which occurs as a result of reactions be-tween dissolved organic matter (i.e DOM, the com-ponents of natural organic matter ... hydrophilic acide, hydrocarbons Fulvic acids Humic acids Figure 1 A hypothetical distribution of SUVA in natu-ral waters Mi/MT is the mass fraction (on an organic carbon basis) of SUVA components ... (DBP) reactivity profile However, SUVA is not a universal predictor of DOM reactivity because a unique DBP reactivity profile was obtained for each water tested The distribution of SUVA within a

Ngày tải lên: 20/10/2022, 14:08

... aquifer and δ 13C of dissolved inorganic carbon (δ 13C-DIC) was measured to give insights into the source of the inorganic carbon in the groundwater Atmospheric background concentrations of CH4 change ... result of methanogenesis This can occur via either acetate fermentation or reduction of carbon dioxide (CO2) (equation (1) and (2) respectively):31 Anaerobic oxidation of CH4 (AOM), via reduction of ... isotopic composition of the gas Oxidation of CH4 in the vadose zone and atmosphere31, groundwater flow fractionation within boreholes32, and the mixing of various sources of CH433 can alter the

Ngày tải lên: 19/11/2022, 11:38

... in the regulation of gill functions in freshwater fish, particularly in ion-poor, acidic blackwaters. The dissolved component (DOM, dissolved organic matter) of aquatic natural organic matter (NOM) ... modification by dissolved organic carbon and synthetic ligands Can J Fish Aquat Sci (1993). 10 Campbell, P., Twiss, M & Wilkinson, K Accumulation of natural organic matter on the surfaces of living ... Biogeochemistry 36, 125–138 (1997). 12 McKnight, D M et al Spectrofluorometric characterization of dissolved organic matter for indication of precursor organic material and aromaticity Limnol Oceanogr 46,

Ngày tải lên: 24/11/2022, 17:42

... release of DOC from sloughing of biofilms and release of otherwise bound colloidal and sedimentary organic carbon (SOC). The concentration of DOC in groundwater is highly variable and sources ... sloughing of biofilms was identified as a likely source of DOC Of interest would be Trang 10future studies incorporating both particulate and dissolved organic carbon analysis from samples of groundwater ... potential quantity of carbon released during abstraction We have also suggested that one of the main sources of OC (biofilms) could replenish and therefore could act as an ongoing source of DOC within

Ngày tải lên: 24/11/2022, 17:42

... mesoporous carbon by filling the liquid glass into the pore of the template (silica SBA-15) before impregnating the carbon presource to limit the penetration of carbon sealed the pore system of SBA-15 ... framework of mesoporous carbon materials creates catalysts to decompose adsorbed, release the adsorption sites, regeneration and reuse of mesoporous carbon, extend the scope of application of materials ... PROPERTIES OF TOXIC ORGANIC SUBSTANCES IN THE WATER ENVIRONMENT OF MESOPOROUS CARBON MATERIALS Major: Theoretical Chemistry and Physical Chemistry Code : 62.44.01.19 SUMMARY OF CHEMISTRY

Ngày tải lên: 09/01/2020, 15:17

... quality of food materials So, at this moment a keen awareness has started in all parts of India for adoption of organic cultivation to cure the ills of modern organic agriculture Organic nutrient sources, ... 5%] Trang 8Table.3 Effect of different organic nutrient sources on economics of onion production Table 3: Effect of different organic nutrient sources on economics of onion production (q ha ... content of soil due to the incorporation of organic manures may be attributed to the direct addition of phosphorus as well as solublization of native phosphorus through release of various organic

Ngày tải lên: 09/01/2020, 20:25

... Investigation of Hydraulic Properties of Soils Varying in Texture, Organic Carbon and Soluble Salt Contents of Arid and Semi-arid Regions Seema*, Rita Dahiya and V.K Phogat Department of Soil Science, ... R2 value of 0.83 at 0-15 cm depth and R2 value of 0.66 at 15-30 cm depth (Fig 4) The results showed that increase in soil organic carbon content, resulted in decrease of the volume of water transmitting ... linearly correlated with organic carbon contents of soils with R2 value of 0.72 (Fig 7) The increase in water holding capacity of the soils is due to higher total porosity of soils with higher SOC

Ngày tải lên: 09/01/2020, 20:52

... quantity of organic matter in soil might have added higher quantity of organic carbon The variance in carbon content was highest in the profile of mango orchard it might be due accumulation of litters ... et al., (1964) Estimation of soil organic carbon stock Soil organic carbon stock (SOCS), kg m-2, was estimated from per cent organic carbon, bulk density and depth of soil with the following ... Distribution of soil organic carbon Soil organic carbon was varying in various layers upto 60 cm of depth and in six land uses from 0.22 to 1.32 per cent in the Old alluvium of Indo – Gangetic

Ngày tải lên: 14/01/2020, 03:05

... characterized by 5.4(±0.5)% of dry matter (DM), 7.9(±0.2)%total nitrogen, 4.5(±0.9)%NH4-N, a C/Norg ratio of 13.9, a pH of 7.9,k of 0.408 d-1 and η of 0.887 Each chemical parameter of the BGR used in ... high N application rates with organic fertilizer, likely as a result of the intensive use of root crops and the removal of byproducts (Figure 3) The amount of applied organic fertilizer in the field ... residence time is a consequence of the improved transfer of carbon from fresh organic matter to the SOM pools The SOM synthesis coefficient η of BGR is higher than that of cattle slurry or manure,

Ngày tải lên: 02/02/2020, 06:14

... Effect of Conservation Tillage and Residue Management on Soil Organic Carbon Storage Soil organic carbon is a measureable component of soil organic matter Organic matter makes up just 2–10% of most ... significantly influenced the total soil carbon (TC), total inorganic carbon (TIC), total soil organic carbon (SOC) and oxidizable organic carbon (OC) content of the surface (0 to 15 cm) soil Wide ... due to the increase of tillage intensity, then forming a large number of small aggregates with relatively low organic carbon content and free organic matter particles Free organic matter particles

Ngày tải lên: 12/03/2020, 21:56

... significantly influenced the total soil carbon (TC), Total inorganic carbon (TIC), total soil organic carbon (SOC) and oxidizable organic carbon (OC) content of the surface (0– 15 cm) soil Wide raised ... et al., (2019) also found that the particulate organic carbon (POC), easily oxidizable carbon (EOC), dissolved organic carbon (DOC) contents of 0–20 cm depth were 80, 22 and 13%, respectively, ... more evidential that the labile fractions of SOC such as cold water extractable organic carbon, hot water extractable organic carbon, microbial particulate organic matter are mainly used to detect

Ngày tải lên: 17/03/2020, 20:01

... amount of organic carbon was indicator as the amount of biofilm developed on PAC shows the amount of organic carbon on PAC after each incubation Figure Figure shows the adsorption isotherm of new ... capacity of PAC in the membrane with molecular weight cut-off of 300,000 Da was significantly higher than that in the aeration tank The decrease in the Amount of Organic Carbon/ amount of PAC ( ... objective of this study is to clarify the effect of DOM and biofilm on the adsorption capacity of PAC in the aeration tank of PACT process Materials and methods 2.1 Operation of powdered activated carbon...

Ngày tải lên: 05/09/2013, 08:40

... dissolution/desorption of organic carbon from solid to solution vary in these soils This should be expected in this Fig Partitioning of metal in the Dutch soils vs partitioning of soil organic carbon 408 ... fractions are of limited value because of the manipulations (especially pH) that are required in the fractionation procedure The concentration of organic carbon and the percentage of the TOC contained ... DR, Hathhorn WE Enhanced mobility of Pb in the presence of dissolved natural organic matter J Contam Hydrol 1997; 29:59 – 80 Karlik B Liming effect on dissolved organic matter leaching Water Air...

Ngày tải lên: 15/03/2014, 23:22

... concentrations and fluxes of dissolved inorganic (DIN) and organic N (DON) in precipitation, throughfall, surface runoff and soil solution for three subtropical forests in a region of South China under ... reported similar dissolved inorganic N (DIN) deposition in bulk precipitation in 2004 (Fang et al., 2007) Here we have continued these measurements but including also analysis of dissolved organic N ... indicated that DIN and DON might have different sources −1 −1 at our site Dissolved organic N input amounted to 17.8 kg N yr , accounting −1 for 36% of total dissolved N (TDN) input (47.6 kg N in 2005,...

Ngày tải lên: 23/03/2014, 00:20

... ACCUMULATION OF DISSOLVED ORGANIC MATTER IN MEMBRANE BIOREACTORS LIANG SHUANG (B Eng., Qingdao Technological University) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CIVIL ... explanation of DOM accumulation In order to fulfill the objectives of this study, the characteristics of DOM obtained from the pilot MBR systems were investigated using the classical dissolved organic carbon ... potential of DOM for GVWP and GVHP membranes .66 Table 4.4 Fouling potential of fractional components of DOM in MBR3 at DOC concentration of mg/L .74 Table 5.1 Typical characteristics of influent...

Ngày tải lên: 14/09/2015, 11:16

... SURFACE CHEMISTRY OF ORGANIC CARBONYL COMPOUNDS AND THEIR DERIVATIVES ON Ni(111) LI TINGCHENG (B.Sc WUHAN UNIVERSITY) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CHEMISTRY ... for identifying a wide variety of intermediates in surface reactions A large number of detailed studies of the adsorption, desorption, and reaction of organic carbonyl molecules on single crystal ... vast amount of studies of the CVD of Cu.26-38 Two of the most useful families of Cu CVD precursors that have been identified are the Cu(II) beta-diketonates and Lewis base adducts of Cu(I) beta-diketonates.21,25...

Ngày tải lên: 17/09/2015, 17:19