Nitrogen
Nitrogen is the chemical element with the symbol N and atomic number 7. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772. Although Carl Wilhelm Scheele and Henry Cavendish had independently done so at about the same time, Rutherford is generally accorded the credit because his work was published first. The name nitrogène was suggested by French chemist Jean-Antoine-Claude Chaptal in 1790 when it was found that nitrogen was present in nitric acid and nitrates. Antoine Lavoisier suggested instead the name azote, from the Greek ἀζωτικός "no life", as it is an asphyxiant gas; this name …
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Laws.Africa · 7 October 2022 English
organic compound N2O nitrous oxide NOx nitrogen oxides SWDS solid waste disposal site SAGERS …
Laws.Africa · 5 September 2022 English
500 μM) and 10 mg l−1 (320 μM) for inorganic nitrogen (DIN) and phosphorus (DIP), respectively. Unfortunately …
Laws.Africa · 26 August 2022 English
percent" means mass percent of nitrogen represented by subtracting the nitrogen contribution from non-meat … present in the product, from the total percent nitrogen analyzed, multiplied by a factor of 30; "lean … equivalent (%)" (LME %) means percent protein nitrogen (N) multiplied by a factor of 30 (LME % = percent … offered for sale; (b) the percent protein nitrogen content may be from a plant or animal source or … 937:1978 (Protein [conversion factor 6.25]) Nitrogen determination, calculation Titrimetry, Kjeldahl …
Laws.Africa · 15 July 2022 English
5 0.025 Nitrate as Nitrogen mg/l 20 3.5 Nitrogen (Total Kjeldahl Nitrogen) mg/l 100 10 Polychlorenated …
Laws.Africa · 8 July 2022 English
R117.67 R58.83 123.91 R61.95 Total kjeldahl nitrogen mg/l R135.66 R67.55 142.85 R71.13 Conductivity …
Laws.Africa · 1 July 2022 English
Powder 123.60 107.48 16.12 123.60 0% • Nitrogen 123.60 107.48 16.12 123.60 0% • SCBA …
Laws.Africa · 9 March 2022 English
monoxide (CO), sulphur oxides (SO2), oxides of nitrogen (NOx), volatile organic compounds (VOCs), polynuclear … pressure, in an atmosphere of a neutral gas (mainly nitrogen). The pyrolysis of tyres provide several chemical …
Laws.Africa · 7 March 2022 English
installations; machines for making oxygen and nitrogen; painting machines; dynamos; filters for cleaning …
Laws.Africa · 28 January 2022 English
instruments and sensors for measuring of crop nitrogen requirements and apparatus and instruments for … software, including software for measuring of crop nitrogen requirements and software for measuring, varying …
Laws.Africa · 28 January 2022 English
are considered negligible in South Africa: a) Nitrogen mineralisation associated with loss of soil organic … above their pre- industrial level; (ii) indirect nitrogen deposition; and (iii) the dynamic effects of …
