README for SVTAG BVOC Tracers to share 150601 •// •// Error for these compounds are generally: •// ~15% precision for total mass (i.e. for correlations), 20-25% total uncertainty including accuracy error. Points below quantification are reported as 0. •// ~20% precision for particle mass (i.e. for correlations), 25-30% total uncertainty including accuracy error •// ~15% for Fp. Fp is calculated using pre-calibrated signals, so Fp is occasionally reported even when mass is below quantification but above detection. •// This indicates that a particle signal was detected at the given Fp of total signal, but is below the level of quantification. •// Fp can be greater than 1 as it is the ratio of two independent measurements of either particle or total gas+particle but most points of Fp > 1 should be within error of 1 •// •// Specific error and LOQ estimates will be provided in ICARTT format. •// Error is somewhat higher from 6/17/13 - 6/22/13 due to operational issues.All times are in local time. •// •// Concentrations for methyl tetrols are likely to change by a scalar based following injection of authentic standards (currently quantified using erythritol) •// Concentrations of hydroxy glutaric acid may still change slightly, though likely not by more than a simple multiplication factor of up to ~30% •// •// G. Isaacman, 8/6/14 •// With questions, e-mail givw@mit.edu •// •// Updated 6/19/2014 to include dates 7/5 through 7/14. Uncertainty is a bit higher for these points, though only points for which error and calibrations are reasonable are included, so these should be okay to use •// Updated 8/6/2014 to include authentic standard calibrations of methyl tetrols, so these compounds and C5-alkene triols have been multiplied by a scaling factor •// Data reported in this file: •//C136_hydroxyglutaricac_Total, ng_per_m3, 3-hydroxy glutaric acid •//C136_hydroxyglutaricac_Fp, fraction_in_particle, 3-hydroxy glutaric acid •//C136_hydroxyglutaricac_Particle, ng_per_m3, 3-hydroxy glutaric acid •//C137_pinic_acid_Total, ng_per_m3, pinic acid •//C137_pinic_acid_Fp, fraction_in_particle, pinic acid •//C137_pinic_acid_Particle, ng_per_m3, pinic acid •//C138_pinonic_acid_Total, ng_per_m3, pinonic acid •//C138_pinonic_acid_Fp, fraction_in_particle, pinonic acid •//C138_pinonic_acid_Particle, ng_per_m3, pinonic acid •//C139_methyl_tetrol_1_Total, ng_per_m3, 2-methyerythritol •//C139_methyl_tetrol_1_Fp, fraction_in_particle, 2-methyerythritol •//C139_methyl_tetrol_1_Particle, ng_per_m3, 2-methyerythritol •//C140_methyl_tetrol_2_Total, ng_per_m3, 2-methylthreitol •//C140_methyl_tetrol_2_Fp, fraction_in_particle, 2-methylthreitol •//C140_methyl_tetrol_2_Particle, ng_per_m3, 2-methylthreitol •//C141_C5_alkene_triol_1_Total, ng_per_m3, 3-methyl-2,3,4-trihydroxy-1-butene •//C141_C5_alkene_triol_1_Fp, fraction_in_particle, 3-methyl-2,3,4-trihydroxy-1-butene •//C141_C5_alkene_triol_1_Particle, ng_per_m3, 3-methyl-2,3,4-trihydroxy-1-butene •//C142_C5_alkene_triol_2_Total, ng_per_m3, cis-2-methyl- 1,3,4-trihydroxy-1-butene •//C142_C5_alkene_triol_2_Fp, fraction_in_particle, cis-2-methyl- 1,3,4-trihydroxy-1-butene •//C142_C5_alkene_triol_2_Particle, ng_per_m3, cis-2-methyl- 1,3,4-trihydroxy-1-butene •//C145_methylglycericaci_Total, ng_per_m3, 2-methyl glyceric acid •//C145_methylglycericaci_Fp, fraction_in_particle, 2-methyl glyceric acid •//C145_methylglycericaci_Particle, ng_per_m3, 2-methyl glyceric acid •//C149_levoglucosan_Total, ng_per_m3, levoglucosan •//C149_levoglucosan_Fp, fraction_in_particle, levoglucosan •//C149_levoglucosan_Particle, ng_per_m3, levoglucosan •//C85_Vanillin_TMS_Total, ng_per_m3, vanillin (total only, all or mostly gas phase) • •// 6/1/15, GIVW, correction to alkene triol calibration factors: •// C141_C5_alkene_triol_1_Total and C141_C5_alkene_triol_1_Particle *= (5.0/2.1) •// C142_C5_alkene_triol_2_Total and C142_C5_alkene_triol_2_Particle *= (2.1/6.0) •// note that this leaves total alkene triol mass approximately unchanged