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www.restekcorp.comby Katia May, Ph.D., R&D Chemist, and Rebecca Wittrig, Ph.D., Food, Flavor, & Fragrance Innovations Chemist
New Reference Materials for Environmental and
Fragrance Analyses
System Evaluation Mix for Organochlorine Pesticides Analyses: US EPA Methods
508/508.1, 608, 617, 625, 1618, 1656, 8080A/8081, 8250A/8270B, CLP
✔
Designed for daily assessment of system performance.
✔
Reveals active sites in the injection port and/or GC column.
✔
Prepared in MTBE—low expansion volume helps minimize backflash.
Approximate Boiling Point/Carbon Number Distribution Marker Stock Standard:
Method TNRCC 1005 for TPH
✔
Easily determine the retention time window for each boiling point range.
✔
Prepared in
n-
pentane, according to EPA requirements.
New Fragrance Materials Association GC Performance Evaluation Test Mixture
✔
Performance evaluation for essential oils and fragrance chemicals.
✔
System Suitability Mixture for GC systems and analytical columns.
✔
Convenient 0.5mL quantity for easy dilution to recommended working solution.
Daily testing for DDT and endrin degradation, a
requirement of US EPA Methods 508/508.1, 608,
617, 625, 1618, 1656, 8080A/8081, 8250A/8270B,
and CLP, typically is performed by injecting the cali-
Aldehydes/Ketones DNPH Standard for US EPA Method TO-11A and 8315
✔
Use with HPLC analysis of carbonyl compounds in air.
✔
Convenient 15µg/mL concentration, similar to the concentration of interest in most ambient
air work.
✔
Certificate of Analysis lists both aldehyde/ketone and -DNPH derivative concentrations.
We offer this new fifteen-component standard for
Method TO-11A and Method 8315. A 150 x 4.6 mm
Ultra C18 HPLC column (cat.# 9174565) provides
n
-hexane (C6)
n
-dodecane (C12)
n
-octacosane (C28)
n
-pentatriacontane (C35)
200µg/mL each in pentane, 1mL/ampul
TNRCC 1005 Retention Time Markers Mix
Each
5-pk.
10-pk.
31698
31698-510
—
w/data pack
31698-500
31698-520
31798
4,4'-DDT
200µg/mL
endrin
100µg/mL
In MTBE, 1mL/ampul
Each
5-pk.
10-pk.
32417
32417-510
—
w/data pack
32417-500
32417-520
32517
Organochlorine Pesticide System Evaluation Mix
benzyl salicylate 362 parts*
cinnamic aldehyde 5 parts
cinnamic alcohol
3 parts
cinnamyl acetate
3 parts
ethyl butyrate
362 parts
eucalyptol
5 parts
geraniol
6 parts
hydroxycitronellal
50 parts
d-limonene
200 parts
thymol crystal
3 parts
vanillin
1 part
benzoic acid
1% of mix
Neat, 0.5mL in an amber ampul
Fragrance Materials Association Test Mix
acetaldehyde-DNPH
acetone-DNPH
acrolein-DNPH
benzaldehyde-DNPH
n
-butyraldehyde-DNPH
crotonaldehyde-DNPH
2,5-dimethylbenzaldehyde
DNPH
formaldehyde-DNPH
hexaldehyde-DNPH
isovaleraldehyde-DNPH
propionaldehyde-DNPH
m
-tolualdehyde-DNPH
o
-tolualdehyde-DNPH
p
-tolualdehyde-DNPH
valeraldehyde-DNPH
15µg/mL each in acetonitrile, 1mL/ampul
Aldehyde-Ketone-DNPH TO-11A Calibration Mix
Each
31808 $50
fast, reliable separations of formaldehyde, many
other aldehydes, and ketones.
bration mix and checking for degradation products.
Because we designed this new reference material
specifically for degradation testing, it provides bet-
ter quality control.
Complete set of Restek standards for Method TNRCC
1005 also includes: TPH Locator Mix (cat.# 31482),
TX TPH Calibration Mix (cat.# 31483), TX TPH
Matrix Spike Mix (cat.# 31484).
*parts per thousand
Figure 1
New test mix for essential oils and fragrance chemicals.
GC_FF00658
Rtx
®
-1701, 60m, 0.25mm ID, 0.25µm (cat.# 12026)
Sample:
5% FMA Test Mix (cat.# 31807) in acetone
Inj.:
1.0µL split (split ratio 40:1), 4mm inlet
liner (cat.# 20814)
Inj. temp.:
285°C
Carrier gas:
helium, constant flow
Flow rate:
0.6mL/min.
Oven temp.:
50°C to 270°C @ 3°C/min.
Det.:
FID @ 300°C
Compound
% in FMA Mix
1. ethyl butyrate
35.7
2. limonene
20.0
3. eucalyptol
0.5
4. geraniol
0.6
5. benzoic acid
1.0
6. cinnamic aldehyde
0.5
7. hydroxycitronellal
5.0
8. thymol
0.3
9. cinnamyl alcohol
0.3
10. cinnamyl acetate
0.3
11. vanillin
0.1
12. benzyl salicylate
35.7
The Fragrance Materials Association (FMA) has pro-
posed a standardized method that calls for analyzing
essential oils by capillary GC on both polar and non-
polar analytical columns. A performance evaluation
mixture should be used to determine the condition
of the chromatographic system, to aid in the detec-
tion of inlet problems, stationary phase degradation,
loss of resolution, changes in sensitivity, and the
presence of reactive sites in the sample pathway. We
have developed a performance evaluation test mix-
ture consistent with the mixture proposed by the
FMA. The required 5% test solution can be conve-
niently made by diluting the entire 0.5mL of neat
mixture to 10mL with acetone. The working solution
will be stable for up to one week if transferred to a
dark container and stored refrigerated.
Each
5-pk.
31807
31807-510