Application of copper sulfate pentahydrate as an ammonia removal reagent for the determination of trace impurities in ammonia by gas chromatography

Aomura, Yoko; Kobayashi, Yoshihiko; Miyazawa, Yuzuru; Shimizu, Hideharu

doi:10.1016/j.chroma.2010.01.039

Cited by 6 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…NH 3 detection based on wet chemical methods for example titrimetry and gravimetry require long analysis time, high chemical consumption and non-continuous. Several conventional methods for quantitation of NH 3 such as fourier transform infrared spectroscopy (FTIR), non-dispersive infrared gas analyzer, electrochemical method [5], gas chromatography (GC) [6] and GC coupled with fluorescence detection [7,8]. Electrochemical method based on potentiometric electrodes are sensitivity, yet still they sustain strong interference from alkali metal ions such as Na + and K + ions.…”

Section: Introductionmentioning

confidence: 99%

Reflectometric Optosensor for Visual Detection of Ammonia Based on Silica Pellet Sensing Material

et al. 2015

View full text Add to dashboard Cite

Ammonia (NH 3 ) has been widely used in the manufacture of fertilizers that applied to soil, but the high consumption of fertilizers will end up with water pollution. Owing to the deleterious effects of NH 3 to human and environment, a new optosensor for NH 3 has been fabricated based on silica pellet sensing material. Microsilica was synthesized by sol-gel method in the presence of cobalt(II) chloride hexahydrate (CoCl 2 ·6H 2 O), followed by manual grinding process to obtain microsized silica particles. Due to the non-transparent pellet material used for NH 3 sensing, a fiber optic reflectance spectrophotometer was employed for monitoring of reflectance signal transduction event as the pellet colour changed from pink to blue hue upon reaction with NH 3 at optimum pH 13. Due to the high porosity and surface area of silica microparticles were used as immobilization matrix, the immobilized Co 2+ ion demonstrated broad dynamic linear range from 18 to 100 ppm NH 3 with a fast response time of 3 min. The reflectometric sensing protocol involves a single-step NH 3 assay which merely requires dispensing small aliquots of NH 3 onto the reaction surface of the pellet sensor. This makes on-site NH 3 detection more user-friendly and convenient when compared to traditional electrochemical-, infrared-and gas chromatography-based methods.

show abstract

Section: Introductionmentioning

confidence: 99%

Reflectometric Optosensor for Visual Detection of Ammonia Based on Silica Pellet Sensing Material

et al. 2015

View full text Add to dashboard Cite

show abstract

“…This is also done because commercially available CuSO 4 is in hydrated form and would be expected to yield a hydrated mixed adsorbent upon impregnation at low temperatures. Understanding the effect of solvation is also significant in itself because water deactivated silica 40,41 and hydrated CuSO 4 42 have extensive application in chromatography to selectively adsorb polar substances. Hence, the effect of hydration and the nature of local interactions that lead to favorable bonding scenarios are addressed based on the geometric structures and NH 3 adsorption energies.…”

Section: Introductionmentioning

confidence: 99%

DFT investigation of NH3 physisorption on CuSO4 impregnated SiO2

Ambati

Saiyed

Rankin

2012

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

In this quantum chemical investigation, NH(3) physisorption onto a model of copper sulfate impregnated silica is compared with pure silica and copper sulfate adsorbents. The physisorption process is modeled as direct binding of the NH(3) molecule to the adsorption site of the dry adsorbents and as displacement of a H(2)O molecule by NH(3) in the hydrated complexes. The surface of silica is represented by a hydroxyl group attached to a silsesquioxane cage, H(7)Si(8)O(12)(OH) and silica impregnated with CuSO(4) by the most stable configuration of the cluster containing a CuSO(4) ion pair placed adjacent to the silica cage. H(2)O is systematically added to the dehydrated adsorbents to investigate the role of water in NH(3) adsorption. Modeling hydrated environments of each type of adsorbent is focused on H(2)O molecules that directly coordinate with the active sites. The results indicate that the binding energy of adsorbing NH(3) onto the mixed adsorbent is greater than in pure silica. This enhanced binding in the mixed adsorbent is consistent with improved Brønsted acidity of the silanol in the presence of CuSO(4).

show abstract

“…1 Meanwhile, gaseous ammonia is toxic to human health and corrosive to metal instruments. 2 Thus, several approaches have been explored to detect ammonia, such as electrochemistry, 3,4 chromatography, 5,6 and colorimetry. 7,8 Among these methods, uorescent sensors have gained increasing interest in recent years, which can be easily integrated as portable devices with high sensitivity for real-time detection.…”

mentioning

confidence: 99%

Cobalt-porphyrin/dansyl piperazine complex coated filter paper for “turn on” fluorescence sensing of ammonia gas

Lin

et al. 2015

RSC Adv.

View full text Add to dashboard Cite

show abstract

Application of copper sulfate pentahydrate as an ammonia removal reagent for the determination of trace impurities in ammonia by gas chromatography

Cited by 6 publications

References 11 publications

Reflectometric Optosensor for Visual Detection of Ammonia Based on Silica Pellet Sensing Material

Reflectometric Optosensor for Visual Detection of Ammonia Based on Silica Pellet Sensing Material

DFT investigation of NH3 physisorption on CuSO4 impregnated SiO2

Cobalt-porphyrin/dansyl piperazine complex coated filter paper for “turn on” fluorescence sensing of ammonia gas

Contact Info

Product

Resources

About