AT LABS METHOD MODIFICATIONS

Many of the OSHA and NIOSH methods quoted on our analytical reports have been modified.  Obviously, since Assay Technology, Inc is a company founded on the use of diffusive monitors, a significant modification for many of these methods is the use of a diffusive monitor instead of active sampling media.  In addition, many of the NIOSH and OSHA methods were established before significant improvements to technology that are now commonplace in the industry.  Also, we have added some extra quality control to make the methods more stable and reliable.  Below is a list of the modified methods AT Labs untilizes and what their major modifcations are:

 

Analytical Method	Chemical(s)	Modfication
TO-11	Aldehyde	Media is GFF, inside a badge.  Eluant have been adjusted.
OSHA 186SG	Acetic Acid	Carbon wafer instead of charcoal in a tube.
OSHA 7	Organics	Use of Cosolvents to better extract Alcohols, ketones; Dual column; Use of Internal Standards; Diffusive media; Different columns from column listed.
OSHA 52	Acrolein	Carbowax column; diffusive badge (Treated silica gel on aluminum wafer)
NIOSH 1640	Acrylonitrile	Diffusive badge, Benzyl Alcohol cosolvent instead of Acetone; Use of Internal standards; dual column
OSHA 125	Metals, ICP	Some metals digested using NIOSH 7082 method and some using NIOSH 7301.
OSHA 188	Ammonia	GFF treated media, instead of carbon beads.  Utilized the ISE option
NIOSH 6011	Chlorine, Bromine	None
OSHA 60	Amine	Badge Media:  NIT on GFF.  Reverse Phase instead of normal phase.  Solvent:  Acetonitrile/Water
NIOSH 7600	Hex Chrom	None
OSHA 32	Phenols (badge)	Badge Media:  Carbon instead of silica gel.
NIOSH 6010	HCN	None
NIOSH 7401	Alkaline Dust	No CO2 purge during the analysis.
NIOSH 500, 600	Dust	None
OSHA 55	Super Glue	Tenax-TA media instead of XAD-7.  Media inside of diffusive monitor.
ASTM D5578	Ethylene Oxide	Carbowax column; Badge media different carbon than the tube;  Acetonitrile/Toluene Solvent (badges only)
NIOSH 7902	Fluorides	ONLY WATER SOLUBLE FLUORIDE PARTICULATES
NIOHS 2016	Formaldehyde	DNPH on GFF instead of silica gel.  Use of buffer to neutralize the extract.  Methanol as eluant.
OSHA 64	Glutaraldehyde	DNPH on GFF instead of silica gel.  Use of buffer to neutralize the extract.  Methanol as eluant.
NIOSH 2532	Glutaraldehyde	DNPH on GFF instead of silica gel.  Use of buffer to neutralize the extract.  Methanol as eluant.
OSHA 42, 47	Isocyanates	None
NIOSH 7903	Acids	None
NIOSH 6013	Hydrogen Sulfide	Slightly different extraction solution.
NIOSH 1550	Hydrocarbon mixtures	Internal Standard, Dual Column Confirmation, Diffusive media
NIOSH 6014	Nitrogen Oxides	Badges Only:  Sampling media is treated GFF instead of instead of treated molecular sieves
OSHA 214	Ozone	Collection Media inside a difussive monitor instead of a cassette.  Slightly different eluant.
NIOSH 1500	Hydrocarbons	Internal Standard, Dual Column Confirmation, Diffusive media
OSHA 52	Acrolein	Diffusive media instead of a tube when applicable.  Carbowax column.  External Calibration.  Standards prepared by adding Acrolein into a solution of 2-HMP and Toluene, instead of spiking onto media.  Extracted with 2 mL instead of 1 mL.  All standard solutions and extracts stored in amber glass.
ASTM 5578-94	Ethylene Oxide	Diffusive media instead of a tube when applicable.  Methanol is used as the solvent with tubes.  Carbowax column.
OSHA 103	Anesthetic Gases	Diffusive media instead of a tube when applicable.  Analytical standards not ISO 17025 complaint.  (No suppliers could be located.)  Solvent is Carbon Disulfide instead of Toluene.  Internal standard calibration.  Dual FID instead of just one column.