Standard Test Method for Determination of Formaldehyde and Other Carbonyl Compounds in Air (Active Sampler ethodology)
|Publication Date:||10 March 1997|
|ICS Code (Aldehydes and ketones):||71.080.80|
1.1 This test method covers a procedure for the determination of formaldehyde (HCHO) and other carbonyl compounds (aldehydes and ketones) in air. This test method is most specific for formaldehyde but, with modification, at least 13 other carbonyl compounds can be detected and quantified.
1.2 This test method involves drawing air through a cartridge containing silica gel coated with 2,4-dinitrophenylhyd
1.3 This test method is based on the specific reaction of carbonyl compounds with DNPH in the presence of an acid to form stable derivatives according to the reaction shown in Fig. 1, (where: both R and R1 are alkyl or aromatic groups (ketones), or both, or either R or R1 is a hydrogen atom (aldehydes)). The determination of formaldehyde, as a DNPH derivative, is similar to that of U.S. EPA Method TO-11 in that it utilizes HPLC with UV detection as the analytical finish. The detection limits have been extended to other carbonyl compounds that can be determined as outlined in Section 13. This test method is suitable for determination of formaldehyde and other carbonyl compounds in the concentration range from approximately 10 ppb to 1 ppm (v/v).
1.4 The sampling method gives a time-weighted average (TWA) sample. It can be used for long-term (1 to 24 h) or short-term (5 to 60 min) sampling of air for formaldehyde.
1.5 This test method instructs the user on how to prepare sampling cartridges from commercially available chromatographic grade silica gel cartridges by the application of acidified DNPH to each cartridge.
1.6 The sampling flow rate, as described in this test method, has been validated for sampling rates up to 1.5 L/min. This flow rate limitation is principally due to the high pressure drop (>8 kPa at 1.0 L/min) across the user prepared silica gel cartridges which have a particle size of 55 to 105 µm. These cartridges are not generally compatible with battery-powered pumps used in personal sampling equipment (for example, those used by industrial hygienists.
1.7 Alternatively, pre-coated DNPH silica gel cartridges are also available and may be substituted provided they can be demonstrated to perform equivalently. Some of these use silica gel of a larger particle size that results in a lower pressure drop across the cartridge. These low pressure drop cartridges may be more suitable for sampling air using battery-powered personal sampling pumps.
1.8 The values stated in SI units are to be regarded as the standard.
1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.