Page:NIOSH Manual of Analytical Methods - 2016.pdf/7

 FO RM ALD EHY DE: M ETH OD 2016, Issue 2, dated 1 5 Ma rch 2003 - Page 7 of 7

APPENDIX B -

USE OF SKC SAMPLER FOR FORMALDEHYDE

The SKC, Inc. sampler for aldehydes (DNPH -coated silica gel tube, catalogue No. 226-119) may be used for sampling formaldehyde with modifications of this method. These modifications include the following: (a) Th e m axim um reco m m end ed a ir volum e sh ould be les s than 15 L at an air conce ntration of 2.5 m g/m 3 (indicated on page 2016-1), because the upper limit of the method for the SKC sam pler is probably less than 37 µg. (b) The procedure for recovery of analyte from the sorbent would be modified, i.e., placement of the sorbent sections in vials, addition of solvent, and possible use of an ultrasonic bath. (c) A volume of solvent much less than 10 mL can be used for recovery. However, the minimum volum e should be tes ted for adequate recovery. (d) Consequences of using a much sm aller volume of solvent for recovery include a lower LOD and LOQ, the need for a different range of calibration standards, and the need for a different range of fortification levels (step 8). (e) The m aximum volume of solution for fortification of the front sorbent bed must be less than 90 µL an d should be d eterm ined (step 8).

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition