ALIPHATIC ALDEHYD ES: METHO D 2018, Issue 1, dated 15 March 2003 - page 8 of 10
TABLE 3. ALIPHATIC ALDEHYDES AND SYNONYMS Aldehyde
S ynonym s
acetaldehyde
ethanal, acetic aldehyde, ethylaldehyde, acetylaldehyde
propionaldehyde
propanal, propylaldehyde, methylacetaldehyde, propaldehyde, propylic aldehyde
valeraldehyde
n-valeraldehyde, penta nal, valeral, valeric aldehyde, am yl aldehyde, valeric acid aldehyde, butyl formal
isovaleraldehyde
isovaleral, isopentald ehyde, isovaleric aldehyde, 3-m eth ylbutan al, 3-methylbutyraldehyde, isoamyl aldehyde
TABLE 4. ANALYTICAL LIMITS OF THE METHOD LOD (µg/sample)
LOQ (µg/sample)
Calibration Range (µg/sample)
Maximu m Sam pler Cap acity a (µg/sample)
acetaldehyde
0.2
0.68
0.68 to >150
105
propionaldehyde
0.3
0.89
0.89 to >150
183
valeraldehyde
0.4
1.30
1.30 to >150
50
isovaleraldehyde
0.2
0.79
0.79 to >150
50
Compound
a
The maxim um sam pler capacity is the upper limit of the method (explained in text). The numbers shown apply to the Supelco sampler, which contains 1 mg of DNPH. Predicted capacities of the W aters sampler are 90% of these values.
TABLE 5. AVERAGE RECOVERIES AND POOLED PRECISION OF MEASUREMENT Compound
b
Pooled RSD b
1.50 µg
3.00 µg
6.00 µg
12.0 µg
20.0 µg
106%
99%
108%
106%
100%
0.031
propionaldehyde
84%
94%
91%
92%
95%
0.028
valeraldehyde
91%
97%
94%
94%
98%
0.021
isovaleraldehyde
83%
84%
85%
88%
85%
0.030
acetaldehyde
a
Average Recovery at the Level Shown (n = 6)
a
Average recoveries were determined after fortification of Supelco samplers with free aldehydes in solution with a syringe. RSDs at all five levels for acetaldehyde and isovaleraldehyde were homogeneous by Bartlett’s test; thus, all five RS Ds for aceta ldehyde and isovaleraldehyde were poolable. Other pooled RSDs were based on three or four individual RSDs.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition
