Rapid Determination Of Nitrogen Research Articles

Application of Visible/Near Infrared Spectrometers to Quickly Detect the Nitrogen, Phosphorus, and Potassium Content of Chemical Fertilizers

The rapid determination of nitrogen, phosphorus, potassium and other major nutrient elements is an important technical guarantee in the quality control of chemical fertilizers. In this study, a small visible spectrometer and a small near-infrared spectrometer were used to collect spectrum information of 33 different common chemical fertilizers including compound fertilizers, blended fertilizers and controlled-release fertilizers. The 550~950 nm and 1050~1640 nm spectra with stable signals were intercepted as the analysis spectrum, and the competitive adaptive reweighted sampling algorithm (CARS) was used to select 161, 229, and 161 spectral characteristic wavelengths for the three nutrient contents of N, P2O5, and K2O respectively. The partial least squares (PLS) and extreme learning machine (ELM) models of N, P2O5, and K2O were established based on the 550~950 nm waveband, 1050~1640 nm waveband, full spectrum, and characteristic wavelength, respectively. The coefficient of determination (R2), root mean square error (RMSE), and residual predictive deviation (RPD) were used to evaluate the effect of the model. With the optimal prediction models, the values of Rp2 for N, P2O5, and K2O were 0.989, 0.963, 0.981, and for RPD were 9.71, 5.09, 7.29, respectively. The research results show that Vis/NIR spectroscopy can predict the content of nitrogen, phosphorus, and potassium nutrients in fertilizers, and the near-infrared band from 1050 nm to 1640 nm has a better prediction effect. The characteristic wavelength selection reduces the spectral variables by 9/10, and the performance of the model based on the characteristic wavelength is close to that of the full-spectrum model.

Rapid determination of nitrogen in nitrocellulose of smokeless ball propellants

AbstractThe nitrogen analyzer method described here is an excellent alternate to the currently acceptable procedures for percent nitrogen in ball powder. It offers the advantages of greatly reduced analysis time, negligible exposure to mercury, minimum exposure to nitrocellulose, no exposure to sulfuric acid and toxic oxides of nitrogen gases. Analyzer method is currently used for ball powder, but experimental work is continuing on other propellants, nitroglycerin, and nitrating acids. The authors propose this method be accepted as an alternate method for nitrogen content in ball powder.

The rapid determination of nitrogen in Primary and Secondary Explosives using the Merz Method

AbstractThe rapid determination of nitrogen in explosives is basically possible using the Heraeus automatic Mikrorapid N as developed by Merz. The combustion of the substance takes place in pure oxygen and the nitrogen is determined volumetrically. However, when sodium and lead azides are analyzed in this way the residues of sodium and lead strongly attack the quartz of the combustion tube. In order to achieve the longest possible service life of the combustion tubes a joint investigation with BASF AG was undertaken to test other tube materials (e. g. steels, nickel, Alsint, Phythagoras) in addition to quartz. Pythagoras proved to be the most suitable material for the combustion of all explosives at 950° C in the same tube. For the determination of sodium azide a quartz finger (according to Merz) can be inserted in the tube which, at 500° C, collects the sodium residues.

Rapid determination of nitrogen, phosphorus and potassium in fertilisers by flow injection analysis

Based on the flow injection technique and routinely using sample injections of 30 µl, and as low as 5 µl, reliable and sensitive methods for the determination of nitrate, potassium, phosphate and ammonia in fertilisers are described in which potentiometric and spectrophotometric detection is used. At sampling rates of 85–120 samples per hour high reproducibility of measurement and low reagent consumptions were achieved. The good agreement between the results obtained with the flow injection methods and those attained by the manufacturer of the fertilisers with conventional techniques shows that flow injection analysis is potentially suitable for the routine analysis of these and similar substrates.

The rapid determination of nitrogen in organic fluorocarbons and fluoronitrogens

The rapid determination of nitrogen in organic fluorocarbons and fluoronitrogens

Rapid determination of nitrogen in steels by vacuum metlting extraction: H Severus-Laubenfrid et al, Z Anal Chem, 218, 1966, 241–249 ( in German)

In investment casting processes for TiAl alloys, a substantial amount of the original raw material does not end-up as a final product but is instead solidified in runners and feeders of the casting system or as a skull in the crucible. Because of the high prices for the virgin alloys, there is a strong interest in remelting this scrap. This is a challenging task due to the tremendous oxygen affinity of titanium alloys. The contact of the melt with shell mould and crucible material leads to oxygen pickup during casting. Up to now no technique exists to avoid this effect, thus any recycling process for TiAl casting scrap potentially needs a deoxidation technique. Within the IMPRESS project, experimental proof for the feasibility of a novel treatment has been obtained in a series of tests and results are presented in this paper. Casting scrap from pilot-trials has been consolidated via classic vacuum induction melting (VIM) in special ceramic crucibles and then successfully deoxidized by pressure electroslag remelting (PESR) under reactive slags. Further refining by vacuum arc remelting (VAR) finally leads to removal of dissolved reducing agent and impurities like non-metallic-inclusions.

235. Rapid determination of nitrogen in steels by vacuum melting: Gerhardtet al, Z anal chem, 218, 1966, 192–196 (in German).

235. Rapid determination of nitrogen in steels by vacuum melting: Gerhardtet al, Z anal chem, 218, 1966, 192–196 (in German).

A rapid method for the determination of organic nitrogen and phosphorus based on a single perchloric acid digestion

Results of nitrogen determinations obtained by perchloric acid digestion of organic matter under reflux were found to be equivalent to those obtained by the conventional sulfuric acid Kjeldahl method. A rapid determination of nitrogen and phosphorus was thus possible after a single perchloric acid digestion. Nitrogen was determined by nesslerization and phosphorus by a conventional molybdenum blue technique. The method devised was found satisfactory for a great variety of natural products and pure organic compounds, including materials containing all kinds of tertiary nitrogen.

The rapid determination of nitrogen in apple juice and cider

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有機微量窒素分析法迅速化の研究

有機微量窒素分析法迅速化の研究

Fertilizer Analysis, Rapid Determination of Nitrogen and Phosphorus Pentoxide in Ammonium Phosphate Fertilizer Solutions

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFertilizer Analysis, Rapid Determination of Nitrogen and Phosphorus Pentoxide in Ammonium Phosphate Fertilizer SolutionsD. N. Bernhart and R. S. BryantCite this: J. Agric. Food Chem. 1956, 4, 8, 688–689Publication Date (Print):August 1, 1956Publication History Published online1 May 2002Published inissue 1 August 1956https://doi.org/10.1021/jf60066a002RIGHTS & PERMISSIONSArticle Views152Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (185 KB) Get e-Alerts Get e-Alerts

A modified micro-dumas method for rapid determination of nitrogen

The Pregl-Dumas method for the estimation of nitrogen has been modified to make it suitable for the rapid performance of a number of analyses in series. The usual combustion tube for carbon and hydrogen determination is used, and the tube filling and procedure are modified.

Rapid determination of nitrogen by a Kjeldahl-Nessler process

Rapid determination of nitrogen by a Kjeldahl-Nessler process

The Stock Method for the rapid determination of nitrogen in organic bodies

The Stock Method for the rapid determination of nitrogen in organic bodies