This concentration is equivalent to ~ 12% Aroclor 1254 on a dry weight basis. Pure Aroclor 1254 was purchased from Agilent Technologies (North Kingston, RI) and was added to the base paint at a concentration of ~ 6 weight percent Aroclor 1254 (liquid basis).

Louis, MO) prepared the base paint for this study by formulating an Aroclor-free paint following as close as practical Monsanto specifications (Parlon™ chlorinated rubber (20 centipoise), Allnex Setal® 11–3466 long‐oil, oxidizing, alkyd resin, R-900 titanium dioxide, xylene, Hi Sol 10 solvent ). The specialty paint formulation company Walter Wurdack Inc. 1960) that specifies the components for the coating. Therefore, an Aroclor 1254-containing chlorinated rubber‐based white marine paint was formulated for this study based upon a 1960s-era Monsanto Technical Bulletin (Monsanto ca. Graphic AbstractĪroclor-containing marine paints, including chlorinated rubber paints, are no longer commercially available. The results of this experiment suggest that Aroclor-containing paint chips found in sediments are likely short-term sources of dissolved-phase PCB to pore or surface waters and that the majority of the PCBs in paint chips remain in the paint matrix and unavailable for partitioning into water. When all leachable PCBs were exhausted, it is estimated that less than 1% of the mass of PCBs in the paint chips was amenable to dissolution. Based on this study, it is estimated that the rate of leaching of PCBs from paint chips would cease after approximately 3 years of exposure to water. The results of this investigation demonstrate that the rate of PCB dissolution from paint chips decreased rapidly and exponentially over time. This laboratory-based study evaluated the rate and extent of leaching of PCBs from paint chips into freshwater. Limited published studies indicate that Aroclor-containing paint is largely inert and exhibits low PCB leaching into water however, the rate and degree of leaching of PCBs from paint chips have not been directly studied. Fugitive Aroclor-containing paint chips generated from vessel maintenance and repair operations represent a potential source of PCB contamination to sediments. The most common PCB formulation used to amend such paints was Aroclor 1254. Polychlorinated biphenyls (PCBs) were added to certain marine vessel bottom paints as a plasticizer to improve the adhesion and durability of the paint.

Equivalent of ms paint in mac