LTAR202404230430S6S7BGC LTAR series 6 vial mixup. All samples run in numerical order. Tech order in trays/racks: …25,26, 28 , 27 ,29,30…., ….48, 73 ,50,51,52, 77 ,54,55,56, 61 ,58,59,60, 57 ,62,63,64, 49 ,74,75,76, 53 ,78,79,80… LTAR series 7 vial mixup …108,110,109,111,112….

LTER20240425S2BGC GC run Appears that vial 11, std 3.0 is off/incorrectly made, compared with all the other standards.

LTAR Series 2 and 3, datafile LTAR2024403280404S2S3BGC notes: Series 2 had a number of vials out of order received by techs. All vials run in order on GC. Vial order from techs in trays: …95, 96, 117, 101, 99, 100, 121, 102, 103…. then …115, 116, 97, 118, 119, 120, 98, 122, 123…. Series 3 only had one vial pair out of order - 57 and 58 were swapped in the tray. All vials run in numerical order.

First LTAR gas chamber sampling run on the GC. All samples run in numerical order. Rack order as submitted by techs had these two issues: vials 98 and 101 were swapped, and vials 135 and 131 were swapped. (Meaning order submitted was …96,97,101,99,100,98,102… and …129,130,135,132,133,134,131,136…. respectively.)

LTER20240306S17 GC run notes: Vial 20 broke in transport. Dave refilled vial with N2 and ran in series - should have blank results for vial 20. All samples run in numerical order, though received vials 163 and 164 swapped in tech’s sample tray.

Vial error on BCSE Series 20 run. Lost nitrous oxide values for vial 66, but was able to continue run uninterrupted otherwise. Setup a separate run that just included a blank vial and vial 66. Transferred those N2O values to the BCSE Series 20 run results for vial 66. CO2 values slightly different, but kept the original values. Rerun saved under same name with a “-A” added at the end of directory/filename.

Found an error in naming a recent run. January, 2024 collection and run for BCSE samples was recorded as Series 18, when it should have been Series 19. This has been corrected in the data file storage on BenGC computer. Updated data directory name to \BCSE20240110S19BGC 2024-01-10 13-09-04. Excel results file found in that folder was also corrected, changing all S18 samples to S19. File sent to Kevin for approval while error corrections are fresh in our minds…

Vial notes for GC run LTER20240206S16BGC.PRP: All vials run in numerical order. Vials swapped in trays received from Techs: 46 & 47, 50 & 51, 66 & 67. i.e. Vials received in this order 44, 45, 47, 46, 48, 49, 51, 50, 52, 53… but run in this order 44, 45, 46, 47, 48, 49, 50, 51, 52, 53….

Combo sampling run of LTER/GLBRC samples - Everything run in order until end of BCSE samples. Tech note that Ambient 1 was actually Duplicate 2. So last 8 BCSE samples physically run in this order: Dup1, Amb1, Dup3, Dup4, Dup2, Amb2, Amb3, Amb4. The sample queue in the software is Dup1, Dup2, Dup3, Dup4, Amb1, Amb2, Amb3, Amb4.

GC run corrections LTER Series 13, collected 11/2/2023. Filename LTER20231102S13BGC.PRP Vials all run in numerical order on GC analysis. Some vials submitted were out of order in the racks. Out of order vials: …176, 177, 182, 179, 180, 181, 178, 183, 184…

LTER Series 12 (10/06/2023) GC analysis notes: All vials run in numerical order. Vials 16 and 14 switched in sampling tray. Vials 73 and 93 switched in sampling tray. Ambient 2 vial broke - replaced with a blank sample (N2). During run second pass, vial #17 at position 31, the analysis paused with the vial lost from the autosampler rack (found on chair). Vial replaced and analysis started back up - GC made CO2 injection and continued on with the run.

GC run of LTER Series 11 notes:
Samples 183 and 175 were switched in trays submitted by techs. All samples run in numerical order on GC. CO2 analyzer did not have the gas turned on for initial run. Part “B” of the run was started over after gas flow was reset. So, the first set of standards are likely bad for this portion of the run - only use the 2nd set of standards for calibration.

Replaced standard cylinder from GC lab. Attached are old and new files with calculated concentrations.

The instrument malfunctioned/stopped during the holiday weekend and was not noticed upon return. Thus, much of the second loop, N2O and CO2 was not analyzed. CH4 values will be kept. Caught this in the flux approval phase by KK in Feb. 2024.

Patrick Wright took the ECD from the LTER Shed Shimadzu for disposal. I removed the detector prior to Patrick’s arrival. GC now has an equipment release form filled out by Patrick. Need to clean instrument and then ready for Surplus (or disposal).

Removed ECD from LTER Shed Shimadzu GC for pickup on Wednesday 5/3 by Patrick Wright.

Setup and started Ben GC series 13 LTER. Series 12 vial caps were not tightened fully so many may have leaked. Need to review S12 and decide whether to use or toss.

Changed N2 and H2 cylinders lab GC.

Kevin and Dave Deep Core afternoon. Training for Dave and collected T3R4 All, T3R5 S1 and 2. Worked on samples for Debasish N2O + dilution on 72 samples.

Running first half of J. Jones CUE samples.

LTER S9 GC samples on GC.

Run of samples for Evans Lab (Holly) kk

Second needle bent on Ben GC running efix samples. Throw out old caps.

GC run, LTER series 7, 20220629-Cathy

GC run, LTER series 5, 20220602-Cathy