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Although nitrogen constitutes the major portion of the Earth's atmosphere, its degassing from the mantle and its circulation in the mantle are not well known. The reason is that because of a <1 nmol/g-N concentration, the nitrogen isotope ratios contained in mantle-derived materials, such as mid-ocean-ridge basalt glasses and diamonds, have been difficult to measure precisely using conventional dynamic mass spectrometers. Recently, Wright et al. 1 established a technique that enabled nitrogendoi:10.2116/analsci.14.485 fatcat:qoscthq46vdgtghhx6keqovcgu