The Determination of Total Nitrogen Including Nitric Nitrogen.

Davisson, B. S.; Parsons, J. T.

doi:10.1021/ie50112a015

Cited by 27 publications

(6 citation statements)

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“…The most widely used modifications today include the salicylic acid-thiosulfate modification method [23], the alkaline reduction modification method [24], and the permanganate-reduced iron modification method [25]. There are serious doubts about the ability of the salicylic acid-thiosulfate method to recover NO 2 − -N quantitatively, especially in undried soils [26]. None of the modifications has shown satisfactory results in recoveries of NO 3 − -N and NO 2 − -N across a wide range of soils and plant materials.…”

Section: Nitrogen Contents Of Chicken Littermentioning

confidence: 99%

Organic Fertilizers in Alabama: Composition, Transformations, and Crop Response in Selected Soils of the Southeast United States

Kpomblekou-A¹,

Mortley²

2016

Organic Fertilizers - From Basic Concepts to Applied Outcomes

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Rapid growth in organic production in the past 20 years is due to consumer concerns about the impacts of conventional agriculture on the environment, food safety, and quality. There are considerable variations in nutrient concentration and the rate of mineralization among organic fertilizers. Some organic fertilizers and application rates are specific to soil types, which affect the nutrient potential. Two organic fertilizers produced in Alabama and added to soils are the chicken or poultry litter (1.8 million Mg annually) and the hydrolyzed liquid fish protein. The under-or overestimation of the total N content of the litter may result in its over-or underapplication with potential environmental consequences to surface waters. The overestimation of the total N may result in its inadequate application. The inorganic forms (ammonium, NH 4 +-N; nitrate, NO 3 −-N; and nitrite, NO 2 −-N) are found in small but sometimes significant amounts especially when broiler litter is stored under environmental conditions favorable to nitrification. Limited information is available on the usefulness of the various modifications of the regular Kjeldahl method in poultry litter analysis and transformations when added to soils. This chapter provides information and our experiences on the sources of organic fertilizers produced in the southeastern United States (Alabama).

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Section: Nitrogen Contents Of Chicken Littermentioning

confidence: 99%

Organic Fertilizers in Alabama: Composition, Transformations, and Crop Response in Selected Soils of the Southeast United States

Kpomblekou-A¹,

Mortley²

2016

Organic Fertilizers - From Basic Concepts to Applied Outcomes

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“…It is recognized that some forms of nitrogen are difficult to convert to ammonia, and for oxides of nitrogen, a reduction step is often (Davisson and Parsons, 1919). Three ml of 0.25N NaOH and approximately 0.2g of Devarda's metal were first added to a micr*Kjeldahl flask which contained a sample.…”

Section: Total Nitrogen Analysismentioning

confidence: 99%

Nitrite Binding Sites on Myoglobin

Lee

Cassens

1976

Journal of Food Science

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“…Ferrum reductum7 was successfully used to oxidize NO 2 − ‐N to NO 3 − ‐N while Olsen8 used KMnO 4 and then ferrum reductum to reduce NO 3 − ‐N to NH 4 + ‐N, which was then followed by the Kjeldahl digestion. The most widely used modifications today include the salicylic acid–thiosulfate modification introduced by Cope,9 the alkaline reduction modification method introduced by Davisson and Parsons,10 and the permanganate–reduced iron modification method introduced by Olsen 8. There are serious doubts about the ability of the salicylic acid–thiosulfate method to recover NO 2 − ‐N quantitatively, especially in undried soils 11.…”

Section: Introductionmentioning

confidence: 99%

“…A low recovery (79.5–83.0%) of NO 3 − ‐N added to a Muscatine soil using the salicylic acid–thiosulfate method was reported 14. The Devarda's alloy method has a limited value 10. The reduction of NO 3 − ‐N in dilute HCl using Devarda's alloy showed 80–95% recovery of NO 3 − ‐N 15.…”

Section: Introductionmentioning

confidence: 99%

Relative proportion of inorganic and total nitrogen in broiler litter as determined by various methods

Kpomblekou-A

2006

J Sci Food Agric

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We report relative proportion of inorganic N in broiler litter and compare the regular Kjeldahl method with three of its modifications (the salicylic acid-thiosulfate modification, the Devarda's alloy modification, and the potassium permanganate-reduced iron modification), and with a Leco-combustion (CHN-600) method for the degree to which they include NO 3 − -N and NO 2 − -N in broiler litter analysis. Inorganic N in the litter (<500 µm) was determined after extraction with 2 mol L −1 KCl. NH 4 + -N and (NO 3 − + NO 2 − )-N in the filtrate were analysed by steam distillation while NO 2 − -N was determined by a modified Griess-Ilosvay colorimetric method. For the determination of total N, 25 mg broiler litter (<1000 µm) was digested according to four semi-micro-Kjeldahl methods in a 100-mL Pyrex Kjeldahl flask using an electrically heated six-flask micro-Kjeldahl digestion rack. Ammonium-N in the digest was determined by steam distillation. The results showed that inorganic N represents a small portion of total N in the samples. Ammonium is the most dominant inorganic N (1.61-5.39 g kg −1 ) in the samples; it represents between 42 and 94% of the inorganic N. The (NO 3 − + NO 2 − )-N contents varied between 0.19 and 5.56 g kg −1 while NO 2 − -N contents in the samples were negligible (<0.6 g kg −1 ). The regular Kjeldahl method and its modifications recovered all the NH 4 + -N added but recovery of added NO 2 − -N and NO 3 − -N varied considerably with the methods. The Devarda's alloy and the potassium permanganate methods showed the highest N measurements while the Leco-combustion showed the lowest N measurements.

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The Determination of Total Nitrogen Including Nitric Nitrogen.

Cited by 27 publications

References 0 publications

Organic Fertilizers in Alabama: Composition, Transformations, and Crop Response in Selected Soils of the Southeast United States

Organic Fertilizers in Alabama: Composition, Transformations, and Crop Response in Selected Soils of the Southeast United States

Nitrite Binding Sites on Myoglobin

Relative proportion of inorganic and total nitrogen in broiler litter as determined by various methods

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