首页> 外文期刊>Journal of Research of the National Institute of Standards and Technology >Primary Determination of Particle Number Concentration with Light Obscuration and Dynamic Imaging Particle Counters
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Primary Determination of Particle Number Concentration with Light Obscuration and Dynamic Imaging Particle Counters

机译:用浅遮蔽和动态成像粒子计数器初级测定粒子数浓度

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摘要

Accurate number concentrations of particles in liquid media are needed to assess the quality of water, pharmaceuticals, and other liquids, yet there are limited reference materials or calibration services available with clear traceability to the International System of Units. We describe two methods, based on very simple modifications of commercial particle counter instruments, that can provide traceable number concentration measurements. One method used a light obscuration counter. Fitting a model to the data enabled correction for timing and coincidence errors, and gravimetric calibration of the syringe pump gave a traceable determination of measured volume. Other potential biases were diagnosed by analysis of the particle size distribution. The other method used a dynamic imaging particle counter (a flow imaging microscope). The instrument was intentionally configured so that each particle passing through the flow cell was imaged multiple times. Following the particle image acquisition runs, runs with a rinse solution released and counted microspheres adsorbed to tubing or flow-cell walls. Software assembled the redundant particle images into tracks, and the total number of tracks was assigned as the number of particles counted. Both light obscuration and dynamic imaging methods, when applied to polystyrene microspheres of approximately 4 μm diameter, achieved expanded uncertainties (k = 2) of approximately 2 % of number concentration and agreed to within a difference of 1.1 %.
机译:液体介质中颗粒的准确数量浓度是评估水,药物和其他液体的质量,但有限的参考资料或校准服务可用于国际单位系统的可追溯性。我们描述了两种方法,基于商业粒子计数器仪器的非常简单的修改,可以提供可追踪的数量浓度测量。一种方法使用了浅遮瑕柜台。将模型拟合到能够对定时和重合误差的校正的数据校正,并且注射器泵的重量校准使得测量体积的可追踪确定。通过分析粒度分布来诊断其他潜在的偏差。其他方法使用动态成像粒子计数器(流量成像显微镜)。有意配置仪器,使得通过流通池的每个粒子经过多次成像。在粒子图像采集运行之后,用释放的冲洗解决方案释放并计数被吸附到管道或流动细胞壁的微球。软件将冗余粒子图像组装成轨道,并且分配了轨道总数,因为计数的粒子数。当施加到大约4μm的聚苯乙烯微球时,透镜和动态成像方法均达到大约2%的数量浓度的膨胀不确定性(k = 2),并同意在1.1%的差异范围内。

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