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Table 1 Some physicochemical properties and work conditions of nanomaterials handled in these 13 factories

From: Longitudinal follow-up of health effects among workers handling engineered nanomaterials: a panel study

Factory numberType of nanomaterial handlingNanomaterial handledMajor nanomaterial handledSize (nm)Amount handled (mg/time)Duration of handling (hour/time)Frequency of handling (times/week)Type of nanomaterials handledTotal populationControl groupExposed group
1UseNano-silverNano-silverUnknown2055LS909
2UseFe2O3Fe2O36-10500021LS404
Nano-gold3-40190.11LS   
Nano-silver5-102.10.11LS   
MfgFe2O3Fe2O36-1050000.28LS   
Nano-gold3-40100.258LS   
Nano-silver5-10210.18LS   
3UseTitanium dioxideTitanium dioxide15-20100002.52.5Powder and LS351025
MfgTitanium dioxideTitanium dioxide15-20100000018Powder and LS   
4UseNano-silverNano-silverCommercial secretCommercial secret37LS211
MfgNano-silverNano-silverCommercial secretCommercial secret73LS   
5UseTitanium dioxideTitanium dioxide205000041LS734
6UseSilicon dioxideSilicon dioxide105000011LS1459
Nano-silver1005011LS   
7UseCarbon nanotubeCarbon nanotube4010011Powder and LS1019
Silicon dioxideSilicon dioxide1005000011Powder   
8UseCarbon nanotubeCarbon nanotube0.5Commercial secretCommercial secretCommercial secretLS291019
9UseSilicon dioxideSilicon dioxide12-173000.24Powder271116
10MfgSilicon dioxideSilicon dioxide160250051LS261115
Silicon dioxide100-2006000058Colloid   
11UseCarbon nanotubeCarbon nanotube11050000.54.5Powder, LS, and gel432518
MfgCarbon nanotubeCarbon nanotube1104000000412Powder and LS   
12UseCarbon nanotubeCarbon nanotube100>2013.5Powder34727
Nano-silver>100>4013.5LS   
13UseTitanium dioxideTitanium dioxideUnknown560.33LS14410
  1. Abbreviation: mfg Manufacturing, LS Liquid suspension
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