نتایج جستجو برای: dissolved nitrate

تعداد نتایج: 62972  

Journal: :Environmental technology 2017
D Ribas M Calderer V Marti A R Johnsen J Aamand B Nilsson J K Jensen P Engesgaard C Morici

This study aims to investigate the depth distribution of the Nitrate Reduction Potential (NRP) on a natural and a re-established wetland. The obtained NRP provides a valuable data of the driving factors affecting denitrification, the Dissimilatory Nitrate Reduction to Ammonium (DNRA) process and the performance of a re-established wetland. Intact soil cores were collected and divided in slices ...

Journal: :Applied and environmental microbiology 1988
S M Arad O D Friedman A Rotem

Porphyridium cultures grown on either nitrate or ammonium as the nitrogen source showed similar patterns of growth and cell wall polysaccharide production. The effect of nitrogen on growth and cell wall polysaccharide production was studied by applying three regimens of supply: batch mode, in which nitrate was supplied at the beginning of the experiment and became depleted at day 6; continual m...

Journal: :Environment and Natural Resources Journal 2023

Dissolved organic matter (DOM) is the most important natural (NOM) fraction which reacts with chlorine to form harmful trihalomethanes (THMs) in water bodies. The characteristics of DOM could be affected by land use catchment, hence comprehensive study understand body important. This was conducted two watersheds different upper stream determine: (1) characteristics, total (TOM), and quality qua...

1999
Ramūnas Stepanauskas Lars Leonardson Lars J. Tranvik Gry M. Berg Deborah A. Bronk Karen L. Bushaw Hélène Edling

Access to bioavailable nitrogen often limits primary production in marine and freshwater ecosystems. Around 70% of nitrogen transported by rivers worldwide consists of dissolved organic nitrogen (DON), but its bioavailability has been poorly investigated. To assess the potential bacterial growth on DON, we developed a bioassay employing natural DON and bacterial inocula in medium manipulated to...

2015
David Kaiser Nicole Kowalski Michael E. Böttcher Daniela Unger Joseph M. Smoak Christian Joshua Sanders

Mangroves serve as either sinks or sources for inorganic and organic nutrients and can mitigate anthropogenic nutrient pollution, control the production in adjacent systems, and prevent eutrophication. To better understand the nutrient dynamics in a subtropical mangrove, we employed a three-way approach in the Nanliu River Estuary, southern China: Pore water profiles and sediment incubations re...

2015
Yao Gong Zhigang Yu Qingzhen Yao Hongtao Chen Tiezhu Mi Jiaqiang Tan Miklas Scholz

The rapid growth of the economy in China has caused dramatic growth in the industrial and agricultural development in the Yellow River (YR) watershed. The hydrology of the YR has changed dramatically due to the climate changes and water management practices, which have resulted in a great variation in the fluxes of riverine nutrients carried by the YR. To study these changes dissolved nutrients...

2014
Daniel Elias Melody J. Bernot Christopher Joseph Salice

Atrazine, metolachlor, carbaryl, and chlorothalonil are detected in streams throughout the U.S. at concentrations that may have adverse effects on benthic microbes. Sediment samples were exposed to these pesticides to quantify responses of ammonium, nitrate, and phosphate uptake by the benthic microbial community. Control uptake rates of sediments had net remineralization of nitrate (-1.58 NO3 ...

Journal: :International journal of advanced academic studies 2022

This paper describes the physico-chemical profile of perennial lake Govindgarh, Madhya Pradesh, where limnological studies were conducted during March 2020 to February 2022. Variables analysed from surface water tank temperature, transparency, pH, electrical conductivity, dissolved oxygen, alkalinity, hardness, chlorides, nitrates and phosphate. The seasonal variations these factors studied int...

Journal: :international journal of advanced biological and biomedical research 2014
reza lalehzari faride ansari samany

groundwater contamination is a serious problem facing the countries. because groundwater is vulnerable to contamination from a variety of sources, and, once contaminated, it is very difficult to restore to its original quality. the main objective of this study was evaluation of groundwater quality in shahrekord aquifer and finding the source of the groundwater contamination. some of the chemica...

2006
YanQi Yang

I hereby declare that I am the sole author of this thesis. This is a true copy of the thesis, including any required final revisions, as accepted by my examiners. I understand that my thesis may be made electronically available to the public. Abstract Iron permeable reactive barriers (PRBs) have been installed at sites contaminated with various reducible organic and inorganic chemicals, particu...

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