氮规则 - 引用次数：1参考来源 - 官能团对染料在电喷雾串联质谱中的离子化和裂解行为的影响 Effects of Functional Groups on Ionization and Fragmentation of Dyestuffs by ESI
氮法则
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Nitrogen rule
abstract:The nitrogen rule states that organic compounds containing exclusively hydrogen, carbon, nitrogen, oxygen, silicon, phosphorus, sulfur, and the halogens either have 1) an odd nominal mass that indicates an odd number of nitrogen atoms are present or 2) an even nominal mass that indicates an even number of nitrogen atoms are present in the molecular ion. The nitrogen rule is not a rule, per se, as much as a general principle which may prove useful when attempting to solve organic mass spectrometry structures.
Originally scheduled to go into effect on January 1st, the rule would have required 27 upwind states to dramatically reduce sulfur dioxide and nitrogen oxide emissions by 2014.
The new rule required about half the states to reduce their emissions of sulphur dioxide, nitrogen oxide and other emissions based on projections of how many pollutants were crossing state lines, and told them how to do it.