Comparison of the Automatic Dumas (Coleman Model 29A Nitrogen Analyzer II) and Kjeldahl Methods for the Determination of Total Nitrogen in Agricultural Materials

1968 ◽  
Vol 51 (1) ◽  
pp. 216-219 ◽  
Author(s):  
G F Morris ◽  
R B Carson ◽  
D A Shearer ◽  
W T Jopkiewicz
Keyword(s):  
Experimental Data ◽  
Standard Deviation ◽  
Total Nitrogen ◽  
Statistical Evaluation ◽  
Kjeldahl Method ◽  
Agricultural Materials ◽  
Combustion Technique

Abstract A wide variety of agricultural materials were analyzed for total nitrogen by the Kjeldahl and automatic Dumas methods. The recoveries of nitrogen compared favorably by both methods when a catalystassisted combustion technique was used in the automatic Dumas method. Statistical evaluation of the experimental data, as measured by standard deviation, showed that the Kjeldahl method was generally more precise than the automatic Dumas method

Comparison of the Automatic Dumas and Kjeldahl Methods for the Determination of Total Nitrogen in Fertilizers

1969 ◽  
Vol 52 (5) ◽  
pp. 943-946
Author(s):  
G F Morris ◽  
R B Carson ◽  
W T Jopkiewicz
Keyword(s):  
Experimental Data ◽  
Total Nitrogen ◽  
Statistical Evaluation ◽  
Kjeldahl Method ◽  
Precision And Accuracy

Abstract Representative N-P-K fertilizers were analyzed for total nitrogen by the automatic Dumas method, using a catalyst-assisted combustion at 900°C, and by the macro Kjeldahl method. The precision and accuracy of both methods were considered to be adequate for this type of material and compared favorably. The automatic Dumas method gave slightly higher results than the Kjeldahl method and a statistical evaluation of the experimental data showed that the Kjeldahl method was generally more precise.

scholarly journals Improvement of the Conditions for the Determination of Total Nitrogen in Fish Meal in Kjeldahl Method and Its Comparison with Dumas Method

2011 ◽  
Vol 60 (1) ◽  
pp. 67-74 ◽  
Author(s):  
Takashi KUBOTA ◽  
Tomoko OSHIDA ◽  
Kozue YANAI ◽  
Yuzuru INOUE ◽  
Seiji MATSUI ◽  
...  
Keyword(s):  
Total Nitrogen ◽  
Fish Meal ◽  
Kjeldahl Method

Zirconium Dioxide, A New Catalyst, in the Kjeldahl Method for Total Nitrogen Determination

1974 ◽  
Vol 57 (5) ◽  
pp. 1228-1230 ◽  
Author(s):  
William Glowa
Keyword(s):  
Total Nitrogen ◽  
Zirconium Dioxide ◽  
Mercuric Oxide ◽  
Cupric Sulfate ◽  
Nitrogen Determination ◽  
Mixed Catalyst ◽  
Kjeldahl Method

Abstract The standard Kjeldahl method for the determination of total nitrogen in fertilizers, feeds, foods, and beverages has been modified to eliminate the use of mercuric oxide, which is poisonous to the environment. A new mixed catalyst, consisting of 0.60 g cupric sulfate and 0.20 g zirconium dioxide in combination or 0.70 g zirconium dioxide alone, is recommended to replace the 0.70 g or more of mercuric oxide used in all official macro Kjeldahl methods.

Tellurium as Catalyst in Semimicro Kjeldahl Method for Total Nitrogen Determination

1982 ◽  
Vol 65 (4) ◽  
pp. 786-790
Author(s):  
Christina F-H Liao
Keyword(s):  
Total Nitrogen ◽  
Organic Nitrogen ◽  
Complete Recovery ◽  
Nitrogen Compounds ◽  
Nitrogen Determination ◽  
Plant Soil ◽  
Clearing Time ◽  
Kjeldahl Digestion ◽  
Kjeldahl Method ◽  
Agricultural Materials

Abstract A modified semimicro Kjeldahl procedure is described for total nitrogen determination in agricultural materials and refractory organic nitrogen compounds, in which tellurium, alone or in combination with copper, is used as a catalyst. Tellurium alone is adequate for complete recovery of nitrogen from nicotinic acid if the acid:salt ratio is carefully controlled to nearly 1. However, when a mixture of tellurium and copper is used, complete nitrogen recovery could be obtained at a higher acidrsalt ratio. Use of a mixture also reduces clearing time when compared with copper alone in the Kjeldahl digestion. For samples containing nitrate, a Devarda's alloy (Cu:Al:Zn = 10:9:1) is proposed as a reducing agent in the pretreatment procedure to convert nitrate to ammonium in 6N H2SO4, with subsequent digestion of the sample by using a mixture of K2S04-catalyst and concentrated H2SO4. The proposed method is applicable for total nitrogen determination including NO3-N in plant, soil, and fertilizer samples.

Determination of Total Nitrogen in Urine by Pyrochemiluminescence: Collaborative Study

1995 ◽  
Vol 78 (2) ◽  
pp. 301-306 ◽  
Author(s):  
Kristi A Boehm ◽  
P Frank Ross
Keyword(s):  
Standard Deviation ◽  
Total Nitrogen ◽  
Collaborative Study ◽  
Urine Samples ◽  
External Control ◽  
Severe Stress ◽  
Average Recovery ◽  
Oxidative Pyrolysis ◽  
Repeatability Standard Deviation

Abstract Twelve collaborating laboratories analyzed 5 blind duplicate samples of human urine for total nitrogen using a pyrochemiluminescence method. The nitrogen content ranged from low (650 mg/L) to high levels (8800 mg/L) in urine samples of people under moderate to severe stress. In addition to test samples, collaborators also received a certified standard (sodium nitrite in water) as an external control. The pyrochemiluminescence assay was performed on urine samples diluted in water within a range of 1:50 to 1:100. The method detects total nitrogen by reaction of the product of high temperature oxidative pyrolysis and ozone. Repeatability standard deviation values (RDSr) ranged from 1.49 to 3.91% and reproducibility standard deviation values (RSDR) ranged from 3.66 to 9.57%. The average recovery of total nitrogen was 99.9%. The pyrochemiluminescence method for determination of total nitrogen in urine was adopted first action by AOAC INTERNATIONAL.

scholarly journals Method Performance Study of the Determination of Total Nitrogen in Soy Sauce by the Kjeldahl Method

2005 ◽  
Vol 21 (9) ◽  
pp. 1129-1132 ◽  
Author(s):  
Shintaro NOZAWA ◽  
Akiko HAKODA ◽  
Kenichi SAKAIDA ◽  
Tadanao SUZUKI ◽  
Akemi YASUI
Keyword(s):  
Total Nitrogen ◽  
Soy Sauce ◽  
Performance Study ◽  
Method Performance ◽  
Kjeldahl Method

scholarly journals Research on Protein Content and Total Nitrogen and a Cob of Maize Strains by FT-NIR Spectrometry

1970 ◽  
Vol 66 (1) ◽  
Author(s):  
Ioan ROTAR ◽  
Laura Monica DALE ◽  
Roxana VIDICAN ◽  
Alin Mogos ◽  
Ovidiu Ceclan
Keyword(s):  
Total Nitrogen ◽  
Agricultural Development ◽  
Near Infrared ◽  
Direct Analysis ◽  
Infrared Spectrometry ◽  
Physico Chemical ◽  
Kjeldahl Method ◽  
Near Infrared Spectrometry ◽  
Maize Stalks

Using Near Infrared Spectrometry has become lately quite a developed technique in the different physico-chemical parameters of the feed as a procedure is extremely elegant and precise use. This paper aims to highlight a way of direct analysis method undestructive protein and total nitrogen using near infrared spectrometry in conjunction with reflected attenuated total. Tests were conducted on samples of maize cob and maize stalks from The Research - Agricultural Development Turda. Samples done at each variant separately. Each sample was subjected to destructive method calculations: Kjeldahl method for determinating the protein, and then collected with NIR spectrum. We have built mathematical models for both the cob and stalks, based on these techniques and multivariated analysis allows the determination of an error prediction for the best protein 0.5% and the total nitrogen of 0.1%.

scholarly journals Optimum Digestive Conditions for Determination of Total Nitrogen in Soy Sauce by Kjeldahl Method

2006 ◽  
Vol 55 (1) ◽  
pp. 15-21 ◽  
Author(s):  
Shintaro NOZAWA ◽  
Kenichi SAKAIDA ◽  
Tadanao SUZUKI ◽  
Akemi YASUI
Keyword(s):  
Total Nitrogen ◽  
Soy Sauce ◽  
Kjeldahl Method
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