First posted April 14, 2023 For additional information, contact: Director, Ohio-Kentucky-Indiana Water Science CenterU.S. Geological Survey6460 Busch Blvd, Suite 100Columbus, OH 43229Contact Pubs Warehouse The U.S. Survey and Nature Conservancy previously collaborated to evaluate changes trends in the concentrations flux of nutrients (total phosphorus, as phosphorus; nitrate plus nitrite, nitro...

The objective of this collaborative study was to evaluate the proposed method for determining the total nitrogen in soy sauce by the Kjeldahl method submitted to the Codex Alimentarius Commission for endorsement in accordance with the protocol for the design, conduct, and interpretation of method-performance studies. The digestive conditions of the proposed method are the addition of 10 mL of H...

DPT, a combination vaccine against diphtheria, tetanus and pertussis is available since many years and still continued in the national immunisation schedule of many countries. Although highly potent, reactions to DPT vaccine are well known, mainly attributed to the factors like Pertussis component, aluminum adjuvant and lower purity of tetanus and diphtheria toxoids. The latter most important a...

Support material used in constructed wetlands has been shown to be a key element and significant mechanism in the process of contaminants removal from sewage including phosphorus compounds. Recycled waste tires processed into small chips that are similar to conventional stone aggregate are currently used in the construction of septic system leach fields and could be a green alternative as suppo...

In 1935 one of us described micromethods for ammonia, urea, total nitrogen, uric acid, creatinine, and allantoin (1). These methods are adapted for the analysis of 1 to 2 ml. aliquots of dilute solutions, e.g. 0.1 mg. per cent of ammonia or urea, and for carrying out a large number of analyses simultaneously. These methods all end in a calorimetric measurement. In the present communication meth...

An evaluation of a new non-destructive technique for the determination of total nitrogen in cane leaves using a Technicon infra-red reflectance analyzer is described. More than 200 leaf samples were analysed and the results indicated that a nitrogen content between 1 and 3% can be accurately determined in less than a minute. Regression analysis indicated that the N values determined by infra-re...

In most cited food composition studies and tables, the proximate system measures protein as total nitrogen (N) (determined by Kjeldahl or Dumas method) multiplied by a specific factor. A factor of 6.25 is used for determining total protein from total N (Jones, Munsey, & Walker, 1942). Although more expensive, it is considered more accurate to base protein content of foods on amino acid data (Gr...

A new method for the determination of nitrogen in biologic material is described. It is basedon an improvedashingprocedureand the Berthelot reactton in which nitrogen is converted to indophenol.The concentration of this substance is determined photometrically. The proposedmethod yields the same results as the Keldahi procedure; however, it offers a higher degree of sensitivity combined with the...