<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Verdugo, Edgard M.</style></author><author><style face="normal" font="default" size="100%">Krause, Caitlin</style></author><author><style face="normal" font="default" size="100%">Genskow, Kelly</style></author><author><style face="normal" font="default" size="100%">Han, Ying</style></author><author><style face="normal" font="default" size="100%">Baltrusaitis, Jonas</style></author><author><style face="normal" font="default" size="100%">Mattes, Timothy E.</style></author><author><style face="normal" font="default" size="100%">Valentine, Richard L.</style></author><author><style face="normal" font="default" size="100%">Cwiertny, David M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">N-Functionalized Carbon Nanotubes As a Source and Precursor of N-Nitrosodimethylamine: Implications for Environmental Fate, Transport, and Toxicity.</style></title><secondary-title><style face="normal" font="default" size="100%">Environmental Science &amp; Technology</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">nitrogen functionalized carbon nanotube arsenic source precursor nitrosodimethylamine toxicity</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2014</style></year></dates><publisher><style face="normal" font="default" size="100%">American Chemical Society</style></publisher><volume><style face="normal" font="default" size="100%">48</style></volume><pages><style face="normal" font="default" size="100%">9279 - 9287</style></pages><isbn><style face="normal" font="default" size="100%">0013-936X</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Hazardous byproducts may be generated during the environmental processing of engineered nanomaterials.  Here, we explore the ability of carbon nanotubes with nitrogen-contg. surface groups (N-CNTs) to generate N-nitrosodimethylamine (NDMA) during chem. disinfection.  Unexpectedly, we obsd. that com. N-CNTs with amine, amide, or N-contg. polymer (PABS) surface groups are a source of NDMA.  As-received powders can leach up to 50 ng of NDMA per mg of N-CNT in aq. suspension; presumably NDMA originates as a residue from N-CNT manufg.  Furthermore, reaction of N-CNTs with free chlorine, monochloramine, and ozone generated byproduct NDMA at yields comparable to those reported for natural org. matter.  Chlorination also altered N-CNT surface chem., with XPS indicating addn. of Cl, loss of N, and an increase in surface O.  Although these changes can increase N-CNT suspension stability, they do not enhance their acute toxicity in E. coli bioassays above that obsd. for as-received powders.  Notably, however, dechlorination of reacted N-CNTs with sulfite completely suppresses N-CNT toxicity.  Collectively, our work demonstrates that N-CNTs are both a source and precursor of NDMA, a probable human carcinogen, while chem. disinfection can produce CNTs exhibiting surface chem. and environmental behavior distinct from that of native (i.e., as-received) materials. [on SciFinder(R)]</style></abstract><issue><style face="normal" font="default" size="100%">16</style></issue><notes><style face="normal" font="default" size="100%">CAPLUS AN 2014:1233176(Journal; Online Computer File)</style></notes></record></records></xml>