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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nanotoxicology
2015 ; 9
(6
): 760-8
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Consumer exposures to laser printer-emitted engineered nanoparticles: A case
study of life-cycle implications from nano-enabled products
#MMPMID25387251
Pirela SV
; Sotiriou GA
; Bello D
; Shafer M
; Bunker KL
; Castranova V
; Thomas T
; Demokritou P
Nanotoxicology
2015[]; 9
(6
): 760-8
PMID25387251
show ga
It is well established that printers emit nanoparticles during their operation.
To-date, however, the physicochemical and toxicological characterization of "real
world" printer-emitted nanoparticles (PEPs) remains incomplete, hampering proper
risk assessment efforts. Here, we investigate our earlier hypothesis that
engineered nanomaterials (ENMs) are used in toners and ENMs are released during
printing (consumer use). Furthermore, we conduct a detailed physicochemical and
morphological characterization of PEPs in support of ongoing toxicological
assessment. A comprehensive suite of state of the art analytical methods and
tools was employed for the physicochemical and morphological characterization of
11 toners widely utilized in printers from major printer manufacturers and their
PEPs. We confirmed that a number of ENMs incorporated into toner formulations
(e.g. silica, alumina, titania, iron oxide, zinc oxide, copper oxide, cerium
oxide, carbon black among others) and released into the air during printing. All
evaluated toners contained large amounts of organic carbon (OC, 42-89%),
metals/metal oxides (1-33%), and some elemental carbon (EC, 0.33-12%). The PEPs
possess a composition similar to that of toner and contained 50-90% OC,
0.001-0.5% EC and 1-3% metals. While the chemistry of the PEPs generally
reflected that of their toners, considerable differences are documented
indicative of potential transformations taking place during consumer use
(printing). We conclude that: (i) Routine incorporation of ENMs in toners
classifies them as nano-enabled products (NEPs); (ii) These ENMs become airborne
during printing; (iii) The chemistry of PEPs is complex and it reflects that of
the toner and paper. This work highlights the importance of understanding
life-cycle (LC) nano-EHS implications of NEPs and assessing real world exposures
and associated toxicological properties rather than focusing on "raw" materials
used in the synthesis of an NEP.