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The results of the Toxicity Characteristic Leaching Procedure (leachate concentrations of 76-288 mg PCB/L) suggest that PCBs in caulking can be mobilized, apparently as complexes with dissolved organic matter that also leach off the caulking material. Removal efficiency was not simply a function of organic matter molecular mass, but also of the nature of the dissolved organic matter. The chemicals of concern include salts, pesticide residues, nitrogen (mostly as nitrate in the drainage water), disinfection by-products, pharmaceutically active chemicals, other chemicals, and precursors of disinfection by-products, like humic substances and other dissolved organic matter, that form a new suite of disinfection by-products when the groundwater is pumped up again and chlorinated or otherwise disinfected for drinking. |
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