GNPS Unknown precursors in forest soil Dissolved Organic Matter by direct-injection ESI tandem MS

This dataset consists of fragmentation data obtained from a representative forest soil DOM sample. The sample was originally taken in November 2005 in a German conifer forest ("Wetzstein") and freeze-dried for storage. In 2018, the sample was reconstituted in bi-distilled water and extracted by SPE (PPL Bond Elut) at an extraction efficiency of 87%. This dataset contains dat for four selected precursor mixtures (isolated at 1 Da window) at m/z 241, 301, 361 and 417. This spans the usual ion abundance range of MS1 fingerprints of terrestrial DOM. Each precursor mixture was measured non-fragmented ("CID0") and at collision energies (CID, N2) of 15, 20 and 25 in reduced profile mode. Each MS/MS spectrum was obtained by averaging 150 scans. For more details, see the connected manuscript.