Evaluation of a diffusion charger for measuring aerosols in a workplace.
Evaluation of a diffusion charger for measuring aerosols in a workplace.
复制标题
评估用于测量工作场所气溶胶的扩散充电器。
DOI：
10.1093/annhyg/met082
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Peters,ThomasM
中科院分区：
文献类型：
--
作者：
Vosburgh,DonnaJH;Ku,BonKi;Peters,ThomasM
来自Ecochem Analytics(美国德克萨斯州联盟城)的DC2000CE型扩散充电器可用于测量工作场所空气中纳米颗粒的表面积浓度。测定了DC2000CE在54~565.7 nm范围内均匀分散的球形颗粒对标准仪器的检测效率。然后，将DC2000CE测量的表面积浓度与工作场所可能遇到的各种颗粒尺寸的多分散气溶胶(丙烯手电筒废气、熏香、柴油废气和亚利桑那州道路粉尘)的测量和检测效率调整后的参考表面积浓度进行比较。DC2000CE测量的表面积浓度与单峰和多峰气溶胶参考仪器测得的表面积浓度之比在0.02至0.52之间。对于气溶胶，调整后的单峰和多峰表面积浓度的探测效率比率更接近统一(0.93-1.19)，其中大部分表面积在用于进行校正的颗粒的尺寸范围内。在创建DC2000CE的校准校正之前，需要包括DC2000CE的整个尺寸范围的检测效率。对于柴油废气，DC2000CE与参考仪器相比保持了线性响应，最高可达2500 mm 2m−3，高于制造商规定的最大范围(1000 mm 2m−3)。确定了与DC2000CE方向、运动和振动有关的物理限制。在测量气溶胶浓度时振动DC2000CE可能会导致~35 mm 2m−3的增加，而移动DC2000CE可能会导致浓度膨胀高达400 mm 2m−3。根据测量的气溶胶浓度，应避免在测量气溶胶时移动或振动DC2000CE。
The model DC2000CE diffusion charger from EcoChem Analytics (League City, TX, USA) has the potential to be of considerable use to measure airborne surface area concentrations of nanoparticles in the workplace. The detection efficiency of the DC2000CE to reference instruments was determined with monodispersed spherical particles from 54 to 565.7nm. Surface area concentrations measured by a DC2000CE were then compared to measured and detection efficiency adjusted reference surface area concentrations for polydispersed aerosols (propylene torch exhaust, incense, diesel exhaust, and Arizona road dust) over a range of particle sizes that may be encountered in a workplace. The ratio of surface area concentrations measured by the DC2000CE to that measured with the reference instruments for unimodal and multimodal aerosols ranged from 0.02 to 0.52. The ratios for detection efficiency adjusted unimodal and multimodal surface area concentrations were closer to unity (0.93–1.19) for aerosols where the majority of the surface area was within the size range of particles used to create the correction. A detection efficiency that includes the entire size range of the DC2000CE is needed before a calibration correction for the DC2000CE can be created. For diesel exhaust, the DC2000CE retained a linear response compared to reference instruments up to 2500mm2m−3, which was greater than the maximum range stated by the manufacturer (1000mm2m−3). Physical limitations with regard to DC2000CE orientation, movement, and vibration were identified. Vibrating the DC2000CE while measuring aerosol concentrations may cause an increase of ~35mm2m−3, whereas moving the DC2000CE may cause concentrations to be inflated by as much as 400mm2m−3. Depending on the concentration of the aerosol of interest being measured, moving or vibrating a DC2000CE while measuring the aerosol should be avoided.