Determination of Nitrogen Content in the Slags of CaO — Al2O3 System by Kjeldahl Method

Kozin, Roman V.; Kuznetsova, L. K.; Hulyanytska, N.; Mossokovska, I.

doi:10.33955/2307-2180(3)2019.55-60

Cited by 4 publications

(2 citation statements)

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“…Nitrogen was determined by Kjeldahl method (Kozin et al, 2019). Briefly, grain and straw samples were weighed (0.2 g), added with 1.3 g of digestion mixture (CuSO410 g + K2SO4100 g and selenium metal powder 1 g) included 3 ml of concentrated H2SO4 in a digestion tube and assembled.…”

Section: Methodsmentioning

confidence: 99%

Nitrogen application rate and timing management for improved grain quality parameters of wheat crop

Khan¹

2021

PAKJAS

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Nitrogen use efficiency under flood irrigation system is generally low (30%) in field crops, which is one of the fundamental factors of high production cost in the developing countries. Optimum rate and timing of N-application is otherwise important to harvest good quality grain for backing in the recent climate change scenario. Optimum N-rate (NAR) corresponds with the application timing (NAT) has resulted in good quality grains. Aim of the study was to focus on spring wheat grain quality and N use efficiency (NUE) with NAR {i.e., 0, 100, 120, 140 and 160 kg ha-1) and NAT (i.e., 100% at sowing (NAR1), 50% at sowing and 50% at tillering (NAT2), 25% at sowing, 50% at tillering and 25% at booting (NAT3) and 25% at sowing, 25% at tillering and 50% at booting (NAT4)}. Treatment impacts were investigated focusing grain yield, grain-N, and quality parameters (i.e., crude protein, gluten, amylose and amylopectin). Experiment was a randomized complete block, in three replications, conducted at Agronomy Res. Farm of the University of Agric. Peshawar in 2016-17 and repeated in 2017-18. Results showed the highest NUE in100 kg N ha-1, followed by a decreasing rate (p<0.05) for every next N-increment. While averaged on N-rates, the highest NUE observed in NAT3 which did not differ fromNAT4 but decreased (p<0.05) for treatment NAT2 with lowest for theNAT1. Pakhtunkhuwa-2015 showed higher NUE among the varieties. Grain-N, grain yield, gluten and amylose did not differ with NAR 140 and 160 kg ha-1 as well as for the NAT3 and NAT4 but decreased for NAT2 and the lowest was noted for NAT1. The N-content of wheat grain was highest in Pakhtunkhuwa-2015, followed by Pirsabak-2015 and the lowest in DN-84. Nonetheless, grain amylopectin showed a reduction with increasing NAR and/or split N-applications from one to two and/or three doses. Cultivars did not show any changes in the amylopectin. It is concluded that in recent climate changes where flood irrigation system is practiced, three N-splits (NAT3 or NAT4) resulted higher quality grains with140 kg N ha-1 to wheat crop

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Section: Methodsmentioning

confidence: 99%

Nitrogen application rate and timing management for improved grain quality parameters of wheat crop

Khan¹

2021

PAKJAS

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“…the determination of nitrogen content in the slag and steel specimens was carried out in the equipment by the Kjeldahl procedure, which was updated in relation to the determination of nitrogen in slags, and its detailed description is given in [21].…”

Section: Research Proceduresmentioning

confidence: 99%

Nitrogen absorption by 04Kh18N10 steel in plasma-arc melting under slag of CaO–Аl<sub>2</sub>O<sub>3</sub> system

Shapovalov,

Mogylatenko,

Lyutyi

et al. 2024

The Paton Welding J.

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Nitrogen as an alloying element of steel is a strong austenitizer, and it has an essential influence on mechanical properties of steels of different grades. It is rational to use gas phases for nitrogen alloying, and the process can be intensified with the application of highly-concentrated energy sources, for instance, plasma. One of the determining factors of metal alloying is the partial pressure of nitrogen and the process temperature. It is difficult to find works, dealing with nitriding of metal melts in plasma-slag process. the paper gives experimental data on dissolution kinetics and nitrogen solubility in 04cr18ni10 steel. The derived mathematical models of nitrogen dissolution in plasma melting are highly significant, which is indicated by the respective determination coefficients. At less than 0.1 atm partial pressure of nitrogen above the melt, the temperature in the range of 1823-2323 K practically does not influence the content of nitrogen in steel, and at a higher partial pressure, the content of nitrogen in steel decreases with the temperature rise. the melt temperature under the experimental conditions was assessed as 2385 K. It was determined that the coefficient of nitrogen distribution between the metal and slag changes only slightly at up to 1 atm partial pressure of nitrogen and is equal to 1.1-1.2.

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Analysis of metallurgical and welding fluxes, slags, and aerosols for hydrogen, nitrogen and oxygen content

Kozin¹,

Lakomskyi²,

Kalynyuk³

2022

Sovrem. elektrometall.

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Determination of Nitrogen Content in the Slags of CaO — Al2O3 System by Kjeldahl Method

Cited by 4 publications

References 1 publication

Nitrogen application rate and timing management for improved grain quality parameters of wheat crop

Nitrogen application rate and timing management for improved grain quality parameters of wheat crop

Nitrogen absorption by 04Kh18N10 steel in plasma-arc melting under slag of CaO–Аl<sub>2</sub>O<sub>3</sub> system

Analysis of metallurgical and welding fluxes, slags, and aerosols for hydrogen, nitrogen and oxygen content

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