نتایج جستجو برای: no3

تعداد نتایج: 7056  

2016
Charles David Ikenberry Michelle L. Soupir Matthew J. Helmers William G. Crumpton Philip W. Gassman Roy R. Gu

Implementation of artificial subsurface drainage (tile drainage) for cultivation of row crops in poorly-drained areas of the Upper Midwest of the United States has enabled the region to be one of the most agriculturally productive areas of the world; but has also resulted in loss of wetland ecosystems, altered hydrology, and increased transport of nitrate-nitrogen (NO3-N) to surface water. The ...

Journal: :The journal of physical chemistry. A 2014
Timur Biktagirov Marat Gafurov Georgy Mamin Elena Klimashina Valery Putlayev Sergei Orlinskii

We demonstrate the application of the combined experimental-computational approach for studying the anionic impurities in hydroxyapatite (HAp). Influence of the carbonation level (x) on the concentration of the NO3(2-) radicals in the HAp nanocrystals of Ca10-xNax(PO4)6-x(CO3)x(OH)2 with x in the range 0 < x < 2 and average sizes of 30 nm is investigated by different analytical methods includin...

2011
C. M. Chen S. P. Sander

The column abundance of NO3 was measured over Table Mountain Facility, CA (34.4N, 117.7W) from May 2003 through September 2004, using lunar occultation near full moon with a grating spectrometer. The NO3 column retrieval was performed with the differential optical absorption spectroscopy (DOAS) technique using both the 623 and 662 nm NO3 absorption bands. Other spectral features such as Fraunho...

Journal: :Journal of environmental sciences 2008
Suwen Li Wenqing Liu Pinua Xie Ang Li Min Qin Fumin Peng Yanwu Zhu

Observation of nighttime nitrate radical (NO3) was performed by using long path differential optical absorption spectroscopy (LP-DOAS), on the outskirts of Hefei, China. The time series of NO3 and supporting parameters were simultaneously measured for a week (31 May-7 June 2006). The results indicated that the average concentration of NO3 was 15.6 pptv with an average lifetimes of 96 s, whereas...

Journal: : 2021

???????? ???????????????????? ?????????? ? ??????? ?????? ??????? ????????? ? ??????? Cr3+ Cu2+ NO3H2O. ? ?????? ???????????? ??????? ????? (III), ?????????? ?? ??????? ???? (II), ???????????? ??????? ???????. ??? ???????? ????? ???????????? «?. ?.». ???????????? ????????? ??? ???????????? ????? ???????? 0,01 ????/?, ??????? ????????? C^+:Cu2+ = 1:1, ?????? ???? 0,3 ????/? (NaNO3), ??????????? ...

2011
Tarek M. Y. El-Sheikh Mohamad A. Fouda Mostafa I. Hassan Ahmed I. Hasaballah

Different concentrations of selected heavy metals in the form of cadmium chloride (CdCl2), copper sulphate (CuSO4), lead nitrate (Pb (NO3)2) and mercuric nitrate (Hg (NO3)2) were tested against immature and mature stage of C. pipiens to assess the toxicity, LC50, total carbohydrate and lipid content. The survival potential of 2 instar larvae was highly affected by the contamination with the tes...

2009
Scott D. Wankel Carol Kendall Adina Paytan

[1] Nitrate (NO3 ) concentrations and dual isotopic composition (dN and dO) were measured during various seasons and tidal conditions in Elkhorn Slough to evaluate mixing of sources of NO3 within this California estuary. We found the isotopic composition of NO3 was influenced most heavily by mixing of two primary sources with unique isotopic signatures, a marine (Monterey Bay) and terrestrial a...

2012
Lei Huo Qi Yang Haitao Shang

This study explored the feasibility of using granular ferric hydroxide as adsorbent for the removal of NO3-N. Optimum conditions for NO3-N removal were found to be pH 5.0 and equilibrium time 80min. The equilibrium sorption isotherm was better described by Langmuir sorption isotherm model. The maximum sorption capacity of granular ferric hydroxide was 4.254mg/g at 298K. A comparison of four kin...

Journal: :Environmental science & technology 2004
J D Istok J M Senko L R Krumholz D Watson M A Bogle A Peacock Y J Chang D C White

The potential to stimulate an indigenous microbial community to reduce a mixture of U(VI) and Tc(VII) in the presence of high (120 mM) initial NO3- co-contamination was evaluated in a shallow unconfined aquifer using a series of single-well, push-pull tests. In the absence of added electron donor, NO3-, Tc(VII), and U(VI) reduction was not detectable. However, in the presence of added ethanol, ...

Journal: :The Science of the total environment 2013
Liping Yang Jiangpei Han Jianlong Xue Lingzao Zeng Jiachun Shi Laosheng Wu Yonghai Jiang

Nitrate (NO3-) pollution in aquatic system is a worldwide problem. The temporal distribution pattern and sources of nitrate are of great concern for water quality. The nitrogen (N) cycling processes in a subtropical watershed located in Changxing County, Zhejiang Province, China were greatly influenced by the temporal variations of precipitation and temperature during the study period (Septembe...

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