AWWA QTC97039

AWWA QTC97039 Determination of Analyst and Method Variabilities Associated With Enumeration of Giardia and Cryptosporidium in Spiked Quality Control Samples
Conference Proceeding by American Water Works Association, 01/01/1997

Jackson, Willa; Straub, Timothy; Monten, Susan; Vinluan, Edlin; Boening, Dean; Feige, Maryann

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This paper reports the results of three studies undertaken to determine the variabilities associated with analysts and methods used for the enumeration of Giardia cysts and Cryptosporidium oocysts. The first study assessed the variability among analysts counting prepared suspensions of Giardia and Cryptosporidium on well slides and hemacytometers. The second study assessed counting method variability (well slides and hemocytometer chamber counts) from batch beaker aliquots containing approximately 100 Giardia cysts and 100 Cryptosporidium oocysts per 10 uL. The third study assessed counting method variability (well slides and chamber counts) from vial aliquots prepared from the batch beakers.