Page:NIOSH Manual of Analytical Methods - 2018.pdf/8

 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