颗粒计数已迅速成为优化饮用水水质不可或缺的技术。其计数和测量隐孢子虫和贾第虫范围内离散颗粒大小的能力是其主要原因。由于饮用水处理不仅涉及最小化颗粒数量，而且涉及分析颗粒本身，因此对颗粒计数器的要求比最初设计的更高。目前，只能对粒子计数器进行校准，以确定粒子大小的准确性。需要一种尺寸和计数校准标准，用于现场评估在线粒子计数器的性能。本文讨论了使用聚苯乙烯乳胶微球实验标准对粒子计数器性能进行大规模研究的结果。 向工业界发送了37个计数控制瓶，每个瓶子包含两个粒度标准，可追溯直径为3微米和10微米，标称计数分别为2000和200/mL。这项研究的目的是了解在不同植物中使用相同标准从不同粒子计数器观察到的结果范围。

Particle counting has rapidly become an indispensable technology for optimizing drinking water quality. Its ability to count and measure the size of discrete particles in the range of Cryptosporidium and Giardia is the primary reason for this. Since drinking water treatment is not merely concerned with minimizing the amount of particles but in analyzing the particles themselves, greater demands are placed on particle counters than those for which they were originally designed. At present, particle counters can only be calibrated for accuracy in sizing particles. There is a need for a size and count calibration standard that can be used in the field to evaluate the performance of on-line particle counters. This paper discusses the results of a large-scale study on particle counter performance using a polystyrene latex microsphere experimental standard. Thirty-seven count control bottles each containing two particle size standards with National Institute of Standards and Technology-traceable diameters of 3 and 10 microns, and with nominal counts of 2,000 and 200 per mL, respectively, were sent to industry. The intent of the study was to get an idea of the range of results observed from different particle counters, in different plants, all using the same standard.