AASHTO TP 66-06 pdf free download

AASHTO TP 66-06 pdf free download.Analysis of Structural Steel Coatings for Hindered Amine Light Stabilizer (HALS).
1. SCOPE
1.1. This method is designed to determine the presence of hindered amine light stabilizer (HALS) in the poiyoi portion of a two-component acrylic urethane coating.
1 .2. The values stated in SI units arc to be regarded as the standard.
1 .3. This standard does 1101 purport to address all oft/ic sa/tv concerns associated wit/i its use. It is (lie responsihthtv oft/ic user of this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. APPARATUS AND MATERIALS
2.1. Gas Chromatograph with Mass Spectrometer Detector.
2.2. 5 percent Phenyl Methyl Siloxane Capillary Column.
2.3. Reference HALS sample.
2.4. Hexane, HPLC grade.
2.5. Centrifuge.
3. INSTRUMENT CONDITIONS
3.1. Install and condition the column in the chromatograph in accordance with manufacturer’s recommendations. Establish operating conditions which yield acceptable separation of the components. See Table I as a guide for initial instrument conditions. Values may need to be altered to achieve necessary resolution of components. Allow sufficient time for the instrument to reach equilibrium and to produce a stable base line.
4. PROCEDURE
4.1. Prepare standards by adding reference HALS compounds to hexane to obtain the desired concentrations. Record the weights of hexane and reference HALS used to the nearest 0.1 mg. These standards will be used to obtain retention time data and atomic masses incidental to the specific HALS.
4.2. Prepare samples by thoroughly mixing two parts hexane to one part polyol in a centrifuge tube. [Note: 10.0 rnL of hexane and 5.0 rnL of polyol is a suitable working volume.] Record the weights of hexane and sample polyol used to the nearest 0.1 mg. Cap the centrifuge tube and centrifuge for five minutes at a minimum relative centrifugal force (RCF) of 43. See Section 5.1 for RCF equation. Fill a sample vial with the resulting supernate.
4.3. Inject a 1.0 μl aliquot of the appropriately prepared reference HALS standard. Determine the retention times for the associated peaks and the atomic masses of the reference HALS compounds.
4.4. Inject a 1.0 μl aliquot of the prepared sample. Determine qualitative presence of the specific HALS by comparing retention times and verifying atomic masses of the HALS compounds.
6. REPORT 6.1. Report qualitative results for the presence of the HALS compound. 6.2. Report quantitative results to the nearest 0.01 percent.AASHTO TP 66-06 pdf download.