Chromatogram Library Chrom-Library
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- Hydrogen in Natural Gas using Nitrogen carrier gas
- (1.0MB) These chromatograms show 10ppm up detection of hydrogen.
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- Formaldehyde detection using HID detector
(1.4MB) Formaldehyde does not respond well on FID or PID detectors, and sensitivity is limited on TCD. HID provide an alternative way to measure formadehyde in the low ppm range.
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- Formic Acid using HID detector
(1.3MB) Formic Acid does not respond well on FID.This chromatogram shows formic acid using a HID detector and 30meter MXT-wax column
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- Propane/Propylene separation on 12foot Haysep D column
(227.2KB) This chromatogram shows the separation at 500ppm each.
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- 1ppb Isoprene, a-Pinene and Limonene in air
(3.6MB) This chromatogram shows a dual column system to measure both the very volatile isoprene and the less volatile a-Pinene and Limonene ( terpenes ) in air. An Alumina PLOT column wa used to separate isoprene from the many possible interfering molecules. A plolar column did double duty as both a pre-column to protect the Alumina and as a separation column to handle the terpenes.
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- Ethylene Oxide in air from .5ppm to 50ppm
(793.8KB)These chromatograms show ETO detection limits below .5ppm
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- H2S and NH3 using 30RTX U-Bond column and PID detector
(589.5KB) This chromatogram shows 100ppm levels of H2S and NH3 on a 30 meter U-Bond column and PID detector.
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- PPM levels of Ammonia using a PID detector (689.1KB)
This chromatogram series shows ammonia ( NH3 ) measurement at levels from 10-1000ppm using a PID detector anda 30 meter RTX U-plot column
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- Ammonia separation on 30 meter RTX U-plot column
(2.9MB) These chromatograms show Ammonia ( NH3 ) seprated on the 30 meter RTX U-plot column.
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- Ammonia ( NH3 ) on 1meter Chrom103 column and TCD detector
(1.0MB) This series of chromatograms shows NH3 vapor injections on a 1meter Chrom 103 packed column in teflon tubing.
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- Ammonia Detection as a continous Stream using the PID detector
(177.1KB) This chromatogram shows that the PID detector can measure Ammonia in a continuous stream ( 40ml/minute ) down to 10ppm levels.
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- Ammonia detection as a continuous stream using the PID
(203.0KB) This chromatogram shows the repsonse of the PID to 200ppm NH3 fed to the PID detector as a continuous stream rather than injected into a column,
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- Ammonia detection using TCD and silicone membrane
(1.9MB) This chromatogram shows detection of Ammonia in water using a TCD detector, Haysep P column and a silicone tube used as a membrane sampling probe.
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- MultipleGas#5 Typical chromatograms using H2 and Argon carrier
(1.6MB) These chromatograms compare the MG5 peaks on H2 and also on Argon carrier Gas.
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- MG5 chromatogram plus methanol and ethanol
(638.9KB) This chromatogram shows a mix of hydrocarbons plus methanol and ethanol separated from the late eluting CO2 peak.
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- MultipleGas#5 ReproducibilityTest
(1.1MB) This series of chromatograms and data show the Reproducibiliy of methane and CO on the Multiple Gas #5 GC
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- MultipleGas#5 GC to GC uniformity (1.3MB)
These 3 chromatograms show the same sample run on 3 different MG5 GCs for sensitivty comparison.
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- Typical MG5 TCD sensitivity using helium and Argon carrier gas
(526.0KB) These chromatograms shows the typical TCD sensitivity of the Multipl Gas #5 GC configuration
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- 1% and 100% CO2 on MultipleGas#5 GC
(946.2KB) These chromatograms compare the peak shape of CO2 at 1% and 100% on the MG5 GC
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- MultipleGas#1 typical chromatogram
(509.9KB) This doc shows a typical chromatogram of 1% gases on the Multiple Gas #1 GC configuration with TCD and FIDmethanizer detectors.
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- H2, O2, N2, CH4, CO on 6' MS5A column and TCD detector
(261.4KB) This cheomatogram was obtained with argon carrier gas.
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- CO2 on 1 meter MS5A column
(222.1KB) This chromatograms shows CO2 eluting from a 1 meter MoleSeive 5A column. It is not well known that this is possible, and may be useful for some applications.
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- Water elution on a 3' MS5A column (390.8KB)
It is well known that water is strongly retained on a moleseive column This chromatogram shows what water looks like as it elutes at 300C.
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- MS5A column before and after Bakeout
(539.8KB) This chromatogram compares the dramatic difference is separation between methane and CO, before and after a weekend bakeout at 270C.
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- CO2 reproducibility on MS5A column
(860.8KB) This series of 3 injections demonstrates a %RSD of .6% for CO2 injected on a 6' MS5A column.
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- 1% Gas Mixture using SRI MultipleGas#1GC HID/TCD (534.4KB)
This chromatogram shows H2, O2, N2, CH4, CO, C2H6, CO2, C2H4 and C2H2 on the SRI Multiple Gas#1 GC configuration with HID and TCD detectors in series.
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- Natural Gas using TCD(1.1MB)
This chromatogram show natural gas standard run the the Natgas GC configuration using Hydrogen carrier gas Data is shown for both 1 meter and 2 meter Haysep D columns in series with a 30meter MXT1 1micron film capillary column
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- Using Room air as carrier gas with TCD detector
(731.0KB) These chromatograms show room air and human breath on a SRI Educational TCD GC using hydrogen and then room air as carrier gas. The room air carrier is supplied by a built-in air compressor making this unit operate with no gas cyclinders.
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Hydrogen Plus CO,CO2, CH4 C2H4 and C2H6 (525.9KB) This chromatogram shows common gases separated on a 12 foot Haysep D column using the SRI MG3 GC.
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Hydrogen ArgonMG5
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- Helium at ambient levels ( 5.2ppm ) (2.2MB)
This series of chromatograms shows helium in outdoor air measured with aTCD detector and both Argon and Air carrier gas.
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- Detection of N2@25ppm
(954.9KB) This chromatogram shows detection of 25ppm N2 using a TCD detector and hydrogen carrier gas.
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- Argon-Oxygen separation using a 24 foot MoleSieve 5A column (1.3MB)
This series of chromatograms shows room air separated on a 24 foot long Molesieve 5A column at various temperatures including in a dorm fridge at 5C.
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- Krypton in Natural Gas
(478.6KB) This chromatogram shows krypton measured in Natural Gas ( 80% methane ). Krypton is difficult to separate from methane on nearly all columns. A TCD detector was used with methane carrier gas which made the detector blind to th e methane in the natural gas sample, so the krypton could then be detected.
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- 1000ppm Krypton in Natural Gas
(267.7KB) This chromatogram shows Krypton in Natural Gas using methane as the carrier. It was difficult to separate krypton from the methane peak in natural gas, but by using methane as the carrier gas we were able to measure the krypton easily.
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- Water and Alcohols on Haysep D column
(207.9KB) This chromatograms shows air, water, methanol, ethanol, and isopropanol on a 6 foot Haysep D column. Oven temperature was 150C isothermal.
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- Residual Solvents on Haysep R/D column
(1.1MB) SRI packs a special 3 foot ( 1 meter ) column that is half Haysep R and half Haysep D. This column separates ethanol from isobutane, methanol from propane and acetone from pentanes.Other column types have trouble with these separations.
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- C1-C7 Carboxylic Acids on a 30 meter MXT-wax 1 micron
(217.4KB) This chromatogram shows the C1-C8 Carboxylic Acids ( VFA ) injected on a 30 meter MXT-Wax 1 micron film column.
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- 37 Fatty Acids on 100 meter RT-2560 .25mm ID column
(461.6KB) This very long narrow bore column can resolve most fatty acids using 30:1 split injection.
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- Glycerol ( Glycerine ) on 30MXT502 column
(725.9KB) This series of chromatograms shows 3% Glycerol ( same as glycerine ) injected on the 310MM GC using a 30 Meter MXT502.2 1micron film column. The good new is that the glycerol elutes well away from the cannabinoid peaks so it does not interfere.
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- Gasless Educational CCD sensitivity
(687.6KB) These chromatograms show the sensitivty of the CCD ( Catalytic Combustion Detector ) detector on the Gasless Educational GC using room air as carrier gas.
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- Hydrogen, Methane and CO2 using Model 30 TCD GC (273.1KB)
This chromatogram shows .5ml of 1% gases separated at room temperature on the very small, low cost Model 30 GC with a 3 foot Haysep D column.
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- CTR1 column chromatograms
(430.0KB) The SRI CTR1 equivilent column set is a combination of Haysep D and MoleSieve 5A columns in parrallel. This is useful for measuring O2, N2, CH4, CO and CO2 in one injection.
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- TCE on Four detectors
(1.3MB) These chromatograms show TCE at 1ppm and 100ppb on FID, PID, DELCD and ECD detectors.
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- BTEX+TCE and PCE using FID/DELCD combo detector
(503.0KB) This chromatograms shows how useful the combination FID and DELCD detector is. The DELCD responds only to the halgenated molecules like TCE and PCE while the FID responds to all hydrocarbons.
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- BTEX on Cannabis GC column
(475.9KB) These chromatograms show 1 and 10ppm BTEX using the 30 meter MXT502 column supplied with SRI Cannabis testing GCs. Its useful to measure benzene and other toxic residual solvents on the capillary column because the packed column used for residual solvents does not elute benzene as a sharp peak so 1ppm detection is not practical on the packed column but is very possible on the capillary column.
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- Hydrogen detection on SRI RGD detector
(472.5KB) These chromatograms show the detection of ambient H2 ( about 5ppm ) using the SRI RGD ( reduction gas detector ).
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- SF6 detection at ambient levels using both loop and trap
(2.4MB) This series of chromatograms shows the detection of SF6 (sulfur hexafluoride ) using an SRI GC with ECD detector. Detection is compared between a 1ml loop injection and a pre-concentrator trap.
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- Edibles GC Stop-flow and Backflush timing
(522.7KB) This chromatogram shows the effect of the mid-point stop flow timing on the Edibles GC configuration.
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- Comparison of MXT500 and MXT502 Columns for Cannabis Analysis
(199.3KB) This one page documents shows the temperature programs used on the two column types. SRI has had to switch from the 15 meter MXT500 column to a 30 meter MXT502 column because the MXT500 column is no longer produced as of 2020. The new MXT502 column is better in some ways.
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- 7 Cannabinoids on 30MXT502.2 column
(849.4KB) This chromatogram shows THCV, CBD, CBC, d8THC, d9THC, CBG and CBN separated on the 30 meter MXT502.2 column.
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- THCA vs d9THC comparison
(501.0KB) These chromatograms show equal amounts of THCA and d9THC injected on-column under identical condtions. It shows that THCA converts to d9THC in the GC very close to ( within statistical error ) the theorectical conversion rate of .877.
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- D10THC separation on SRI GC (263.5KB)
This chromatogram shows that D10 elutes between D8 and D9 on an SRI 310 GC using cylinder H2 carrier and a two column backflush configuration.
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- THCP and 11HydroxyD9THC plus 7 other cannabinoids
(857.2KB) This chromatogram shows the elution times of 9 cannabinoids including THCP and 11HydroxyD9THC.
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- Typical 1 minute Mudlogger C1-C5 and C6+ backflush
(872.6KB) These chromatogram show the typical tests we run for the 1 minute mudlogger configuration.
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- Tap Water Purge&Trap with ECD and DELCD detectors in series
(543.9KB) This chromatogram shows the relative responses of the DELCD and ECD detectors to the TriHaloMethanes ( THM ) in tap water.
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- Ethylene Oxide at ppm levels (733.6KB)
These chromatogams show .5, 5 and 50ppm ETO on a 3' Haysep D column
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- 10ppm BTEX+ on PID and FID in series (445.9KB)
This chromatogram shows the response of the two detectors plumbed in series.
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- Trihalomethanes in Water using DELCD detector and Purge&Trap
(1.6MB) This set of chromatograms shows the measurment of THMs in water ( at ppb level ) using the SRI 8610C GC equipped with DELCD detector and Purge&Trap concentrator. Results are shown with helium carrier gas and then again using plain room air ( from the built-in air compressor ) as the carrier gas resulting in a GC which requires no gas to perfrom this analysis.
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- Greenhouse Gas GC chromatograms
(2.8MB) Final test chromatograms from a Greenhouse Gas GC which also has a TCD detector for H2, O2, N2 analysis alsong with the normal methane, CO2 and N2O peaks.
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- Typical Cannabinoids Chromatogram
(107.5KB) This chromatogram shows a typical separation of CBD, CBC, d9THC, CGB and CBN on a 15meter MXT500 .25micron .53mmid column.
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- Hemp sample derivitized and un-derivitized
(1.3MB) This series of chromatograms shows a hemp sample measured two ways, derivitized and not derivitized.
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- Terpenes and Cannabinoids in one analysis (463.5KB)
This chromatogram shows 15 terpenes and 5 cannabinoids measured in one analysis on a Restek 30 meter MXT502.2 1 micron film column
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- Olive Oil and MCT OIL on the SRI310MM cannabis GC (1.1MB)
These chromatograms show olive oil, MCT oil and the cannabinoids on the 15meter MXT500 .25micron column.
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- Cannabinoids in MCT oil using SRI 310Edibles GC configuration
(887.0KB) These chromatograms show how the SRI 310 Edibles GC uses its stop-flow and backflush capability to reject the MCT and hiogher boiling oils while still measuring the cannabinoids ( CBD, THC and CBN ). The pre-column in this GC configuration cataches the higher boiling molecules and then backflushes them to vent so they never arrive at the main column.
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- Cannabis "Edibles" GC test sequence (1.1MB)
This series of chromatograms show how the stop-flow timing affects the high boiling peak cut-off
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- Argon-methane ( P5 ) compared to Nitrogen as ECD carrier gas
2.0MB) This chromatogram series compares the Greehhouse Gas GC configuration using P5 vs N2 when measruing N2O in room air and also N2 vs Hydrogen as carrier gas when measruing ambient methane. Reproducibily is also caculated for N2O using P5 carrier.
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- Sulfur in Natgas
(1.1MB) These chromatograms show H2S, COS, SO2 and DimethylSulfide separated from natural gas hydrocarbons C1-C6 using the SRI Sulfur in Natural Gas GC configuation. This configuation uses two columns to achieve the best separation.
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- 18ppb H2S ( hydrogen sulfide )
(947.4KB) This series of chromatograms shows 18ppb of H2S measured using a preconcentrator trap and FPD detector
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- Monomers on FID and 10MXT1 3micron column
(676.8KB) This chromatogram shows assorted monomers separated on a non-polar column.
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