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- W2054991344 abstract "Abstract Measuring nitrogen stable isotopes is common in laboratories involved in nitrogen research in agriculture, as they can obtain information on source-sink balances in the environment. Conventional quadrupole mass spectrometers are not commonly used in studies of the 14 N 15 N ratio in the environment; the main reason is the high standard deviation of samples in the range of natural abundances, since they do not have the precision of magnetic-sector mass spectrometers. It has previously been shown that, following the addition to soil of 15NH4+, the quadrupole mass spectrometer QM 130-CS (RIAL Vacuum, Italy) can be efficiently used to determine low 15N enrichment levels, but that it cannot be used when the 15N abundances to be measured are at the level of natural 15N abundance. One reason is that the very simple setup of the inlet line of the quadrupole does not eliminate the small current fluctuations of the detector (electron multiplier). A different inlet line, resembling a double-beam spectrophotometer, for the measurement of 15N natural abundances is proposed." @default.
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- W2054991344 date "1992-08-01" @default.
- W2054991344 modified "2023-09-26" @default.
- W2054991344 title "Use of quadrupole mass spectrometers in environmental studies: Determination of 15N abundances" @default.
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- W2054991344 doi "https://doi.org/10.1016/0026-265x(92)90022-u" @default.
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