enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Nitrogen oxide sensor - Wikipedia

    en.wikipedia.org/wiki/Nitrogen_oxide_sensor

    The levels of NO are around 100–2000 ppm (parts per million) and NO 2 20–200 ppm in a range of 1–10% O 2. The sensor has to be very sensitive to pick up these levels. The main challenges in the sensor development are selectivity, sensitivity, stability, reproducibility, response time, limit of detection, and cost.

  3. NOx - Wikipedia

    en.wikipedia.org/wiki/NOx

    Nitrogen oxides are released during manufacturing of nitrogen fertilizers. Though nitrous oxide is emitted during its application, it is then reacted in atmosphere to form nitrogen oxides. This third source is attributed to the reaction of atmospheric nitrogen, N 2 , with radicals such as C, CH, and CH 2 fragments derived from fuel, [ 26 ...

  4. Freshwater acidification - Wikipedia

    en.wikipedia.org/wiki/Freshwater_acidification

    Diagram depicting the sources and cycles of acid rain precipitation. Freshwater acidification occurs when acidic inputs enter a body of fresh water through the weathering of rocks, invasion of acidifying gas (e.g. carbon dioxide ), or by the reduction of acid anions, like sulfate and nitrate within a lake, pond, or reservoir. [ 1 ]

  5. Selective catalytic reduction - Wikipedia

    en.wikipedia.org/wiki/Selective_catalytic_reduction

    Selective catalytic reduction (SCR) means converting nitrogen oxides, also referred to as NO x with the aid of a catalyst into diatomic nitrogen (N 2), and water (H 2 O). A reductant, typically anhydrous ammonia (NH 3), aqueous ammonia (NH 4 OH), or a urea (CO(NH 2) 2) solution, is added to a stream of flue or exhaust gas and is reacted onto a ...

  6. Nitrogen oxide - Wikipedia

    en.wikipedia.org/wiki/Nitrogen_oxide

    NO y (or NOy) refers to the sum of NO x and all oxidized atmospheric odd-nitrogen species (e.g. the sum of NO x, HNO 3, HNO 2, etc.) NO z (or NOz) = NO y − NO x; Mixed Oxides of Nitrogen ("MON"): solutions of nitric oxide in dinitrogen tetroxide/nitrogen dioxide.

  7. Air pollution measurement - Wikipedia

    en.wikipedia.org/wiki/Air_pollution_measurement

    Air pollution is caused by many things. In urban environments, it can contain many components, notably solid and liquid particulates (such as soot from engines and fly ash escaping from incinerators), and numerous different gases (most commonly sulfur dioxide, nitrogen oxides, and carbon monoxide, all related to fuel combustion).

  8. Nitrification - Wikipedia

    en.wikipedia.org/wiki/Nitrification

    Nitrogen cycle. Nitrification is the biological oxidation of ammonia to nitrate via the intermediary nitrite.Nitrification is an important step in the nitrogen cycle in soil.The process of complete nitrification may occur through separate organisms [1] or entirely within one organism, as in comammox bacteria.

  9. Denitrifying bacteria - Wikipedia

    en.wikipedia.org/wiki/Denitrifying_bacteria

    Nitric oxide reductase (Nor) then converts nitric oxide into nitrous oxide 2 NO + 2 H + + 2 e − → N 2 O + H 2 O. Nitrous oxide reductase (Nos) terminates the reaction by converting nitrous oxide into dinitrogen N 2 O + 2 H + + 2 e − → N 2 + H 2 O. It is important to note that any of the products produced at any step can be exchanged ...