From 2011–2015, the National Institute for Occupational Safety and Health Nanotechnology Field Studies Team conducted 11 evaluations at worksites that either produced engineered nanomaterials (ENMs) via a wet process or used ENMs in a wetted, suspended, or slurry form. Wet handling or processing of ENMs reduces potential exposure compared to dry handling or processing; however, air sampling data indicated exposures may still occur. Information was gathered about each company, production processes, ENMs of interest, and control measures. Exposure assessments included air sampling using filter media, surface wipe sampling, and real-time particle counting by direct-reading instruments. Electron microscopy analysis of air filters confirmed the presence of ENMs of interest (10 of 11 sites). When a method was available, chemical analysis of filters was also used to detect the presence of ENMs (nine of 11 sites). Wipe samples were collected at four of the 11 sites, and, in each case, confirmed the presence of ENMs on surfaces. Direct-reading data showed potential nanomaterial emissions (nine of 11 sites). Engineering controls included fume hoods, cleanrooms, and enclosed processes. Personal protective equipment was required during all 11 evaluations. Recommendations to address potential exposures were provided to each company following the hierarchy of controls.

从2011年至2015年，美国国家职业安全与健康研究院纳米技术现场研究小组对通过湿法生产工程纳米材料（ENM）或以湿，悬浮或浆状形式使用过的ENM的工作场所进行了11次评估。与干式处理或加工相比，ENM的湿式处理或加工可减少潜在的暴露；但是，空气采样数据表明仍可能发生暴露。收集了有关每个公司，生产过程，感兴趣的ENM和控制措施的信息。暴露评估包括使用过滤介质的空气采样，表面擦拭采样以及通过直读仪器进行的实时颗粒计数。空气过滤器的电子显微镜分析证实了感兴趣的ENM的存在（11个位点中的10个）。当有方法可用时，过滤器的化学分析还用于检测ENM（11个位点中的9个）的存在。在11个地点中的四个地点收集了擦拭样品，并在每种情况下确认了表面上存在ENM。直读数据显示了潜在的纳米材料排放（11个站点中的9个）。工程控制包括通风橱，无尘室和封闭过程。在所有11次评估中都需要个人防护装备。根据控制的层次结构，已向每家公司提供了解决潜在风险的建议。洁净室和封闭过程。在所有11次评估中都需要个人防护设备。根据控制的层次结构，已向每家公司提供了解决潜在风险的建议。洁净室和封闭过程。在所有11次评估中都需要个人防护装备。根据控制的层次结构，已向每家公司提供了解决潜在风险的建议。