The Percent Un-Ionized Ammonia in Aqueous Ammonia Solutions at Different pH Levels and Temperatures

1972 ◽  
Vol 29 (10) ◽  
pp. 1505-1507 ◽  
Author(s):  
R. P. Trussell
Keyword(s):  
Aqueous Solution ◽  
Aqueous Ammonia ◽  
Ammonia Molecule ◽  
Ammonium Ion ◽  
Ready Access ◽  
Freshwater Environments

Previous studies have shown that the un-ionized ammonia molecule and not the ammonium ion is the form of the toxicant harmful to fish. Prior attempts to quantify the amount of un-ionized ammonia in an aqueous solution have been confusing. Data given here provide ready access to the amount of un-ionized ammonia over a range of temperature and pH that is common in temperate freshwater environments.

Proton-Coupled Transport of Ammonia in Aqueous Hydrochloric Acid

1985 ◽  
Vol 38 (2) ◽  
pp. 249 ◽  
Author(s):  
DG Leaist
Keyword(s):  
Diffusion Coefficient ◽  
Hydrochloric Acid ◽  
Aqueous Ammonia ◽  
Transport Coefficients ◽  
Ammonia Concentration ◽  
Ammonium Ion ◽  
Coupled Transport ◽  
Ternary Diffusion ◽  
A Value ◽  
Hydrochloric Acid Solutions

Ternary diffusion in aqueous ammonia + hydrochloric acid solutions has been measured at 25°C. It is shown that the transport coefficients can be successfully predicted from the mobilities of H+, Cl -, NH4+, and un- ionized ammonia species present in the solutions. When an ammonia concentration gradient is prepared in a solution containing excess acid, the region of the solution with the higher ammonia concentration is depleted in H+ by formation of ammonium ion: NH3+H+ ↔ NH4+. As highly mobile H+ diffuses up the ammonia gradient, there is counterflow of NH4+ in order to maintain electroneutrality . This mechanism leads to rapid diffusion of the ammonia component as NH4+. Binary diffusion coefficients of aqueous ammonia have also been measured. Extrapolation gives 2.08(�0.01) × 10-2m2 s-1 for the limiting diffusion coefficient of un-ionized ammonia, a value 6% greater than the limiting diffusion coefficient of the ammonium ion.

ChemInform Abstract: Photocatalytic Oxidation of Aqueous Ammonia (Ammonium Ion) to Nitrite or Nitrate at TiO2 Particles.

ChemInform ◽  
2010 ◽  
Vol 23 (43) ◽  
pp. no-no
Author(s):  
C. H. POLLEMA ◽  
E. B. MILOSAVLJEVIC ◽  
J. L. HENDRIX ◽  
L. SOLUJIC ◽  
J. H. NELSON
Keyword(s):  
Photocatalytic Oxidation ◽  
Aqueous Ammonia ◽  
Ammonium Ion ◽  
Tio2 Particles

Direct aqueous synthesis of cyanomethyl thioglycosides from reducing sugars; ready access to reagents for protein glycosylation

2016 ◽  
Vol 14 (28) ◽  
pp. 6679-6682 ◽  
Author(s):  
Stewart R. Alexander ◽  
Antony J. Fairbanks
Keyword(s):  
Aqueous Solution ◽  
Reducing Sugars ◽  
Protein Glycosylation ◽  
Aqueous Synthesis ◽  
Ready Access

Unprotected carbohydrates can be directly converted into cyanooethyl thioglycosides, which in turn may be used for protein glycosylation, in a completely stereoselective manner by reaction with 2-chloro-1,3-dimethylimidazolinium chloride (DMC) and mercaptoacetonitrile in aqueous solution.

REMOVAL OF AMMONIUM ION FROM AQUEOUS SOLUTION USING MAGNETICALLY MODIFIED ZEOLITE

2008 ◽  
Vol 29 (6) ◽  
pp. 633-639 ◽  
Author(s):  
I. W. Nah ◽  
K.‐Y. Hwang ◽  
Y.‐G. Shul ◽  
C. Jeon
Keyword(s):  
Aqueous Solution ◽  
Ammonium Ion ◽  
Modified Zeolite

scholarly journals Ammonia Bioremediation from Aquaculture Wastewater Effluents Using Arthrospira platensis NIOF17/003: Impact of Biodiesel Residue and Potential of Ammonia-Loaded Biomass as Rotifer Feed

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5460
Author(s):  
Mohamed Ashour ◽  
Ahmed E. Alprol ◽  
Ahmed M. M. Heneash ◽  
Hosam Saleh ◽  
Khamael M. Abualnaja ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Brachionus Plicatilis ◽  
Batch Process ◽  
Arthrospira Platensis ◽  
Ammonia Removal ◽  
Ammonium Ion ◽  
Initial Ph ◽  
Aquaculture Wastewater ◽  
Initial Description ◽  
Biodiesel Residue

The present work evaluated the capability of Arthrospira platensis complete biomass (ACDW) and the lipid-free biomass (LFB) to remove ammonium ions (NH4+) from aquaculture wastewater discharge. Under controlled conditions in flasks filled with 100 mL of distilled water (synthetic aqueous solution), a batch process ion-exchange was conducted by changing the main parameters including contact times (15, 30, 45, 60, 120, and 180 min), initial ammonium ion concentrations (10, 20, 30, 40, 50, and 100 mg·L−1), and initial pH levels (2, 4, 6, 8, and 10) at various dosages of ACDW and LFB as adsorbents (0.02, 0.04, 0.06, 0.08, and 0.1 g). After lab optimization, ammonia removal from real aquaculture wastewater was also examined. The removal of ammonium using ACDW and LFB in the synthetic aqueous solution (64.24% and 89.68%, respectively) was higher than that of the real aquaculture effluents (25.70% and 37.80%, respectively). The data of IR and Raman spectroscopy confirmed the existence of various functional groups in the biomass of ACDW and LFB. The adsorption equilibrium isotherms were estimated using Freundlich, Langmuir, and Halsey models, providing an initial description of the ammonia elimination capacity of A. platensis. The experimental kinetic study was suitably fit by a pseudo-second-order equation. On the other hand, as a result of the treatment of real aquaculture wastewater (RAW) using LFB and ACDW, the bacterial counts of the LFB, ACDW, ACDW-RAW, and RAW groups were high (higher than 300 CFU), while the LFB-RAW group showed lower than 100 CFU. The current study is the first work reporting the potential of ammonia-loaded microalgae biomass as a feed source for the rotifer (Brachionus plicatilis). In general, our findings concluded that B. plicatilis was sensitive to A. platensis biomass loaded with ammonia concentrations. Overall, the results in this work showed that the biomass of A. platensis is a promising candidate for removing ammonia from aquaculture wastewater.

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