Click to Purchase and Download this Standard or Test Method
Revision Date: December 23, 2010
Updated On: February 02, 2011
In order to calculate the volatile organic content (VOC) of paints containing EPA exempt solvents, it is necessary to know the acetone, methyl acetate, or parachlorobenzotrifluoride content. This gas chromatographic test method provides a simple and direct way for measuring these solvents. Each analyte is measured with respect to a unique internal standard. For acetone, the internal standard used is acetone-d6, for methyl acetate it is methyl acetate-d3, and for PCBTF it is metachlorobenzotrifluoride (MCBTF). These unique analyte/internal standard pairs behave very nearly as single solvents with respect to evaporation rate and adsorption rate onto a coated silica fiber (SPME) but are separable on a gas chromatograph (GC) capillary column. The only critical analytical technique required for successfully performing this test method is the ability of an analyst to weigh a paint sample and internal standard, corresponding to the analyte of interest, into a septum capped vial. After weighing, solvent evaporation has no effect on the final value of the determination. Since whole paint is not injected into the gas chromatograph, the analytical system is never compromised.
1.1 This test method is for the determination of acetone, methyl acetate, or parachlorobenzotrifluoride (PCBTF), or combination of any of the three, in paints and coatings, by solid phase microextraction (SPME) headspace sampling, and subsequent injection into a gas chromatograph. It has been evaluated for cellulose nitrate, acrylic, and urethane solvent-borne systems. The established working range of this test method is: acetone, 28 to 90 %; methyl acetate, 12 to 22 %; parachlorobenzotrifluoride, 10 to 17 %. There is no reason to believe that it will not work outside these ranges. A minor modification of this test method would make it suitable for the analysis of the same analytes in water-borne coatings (see Note 1).
Note 1—Water-borne paints are internally standardized and diluted with water followed by addition of solid sodium chloride.
EDCO's Quick Response Codes
EDCO now includes Quick Response Code decals on machines. These QRC's provide customers with instant jobsite advice, problem solving tips and much more. Click to watch EDCO machines in action.
ECS DUST COLLECTORS
Immediate Availability & the Best Rental Rates in town... 3,000 to 50,000 cfm dust collectors. Diesel or electric power sources. Call 800-414-0672 or visit us at www.ecsone.com
CNSL Based Products
Renewable CNSL epoxy curing agents and resins with fast cure at low temperature, adhesion to unprepared surfaces and excellent corrosion and water protection.
Work with a scaffold company you can trust
Empire Scaffold is a full-service scaffold company providing specialized, on-site support for the life of the project, with products & experience to keep your projects up & running, safely.