This International Standard gives guidelines for the evaluation of uncertainty in quantitative microbiological<\/p>\n
analyses based on enumeration of microbial particles by culture. It covers all variants of colony count methods<\/p>\n
and most probable number estimates.<\/p>\n
Two approaches, the component (also known as bottom-up or step-by-step) and a modified global (top-down)<\/p>\n
approach are included.<\/p>\n
The aim is to specify how values of intralaboratory operational variability and combined uncertainty for final<\/p>\n
test results can be obtained.<\/p>\n
The procedures are not applicable to methods other than enumeration methods.<\/p>\n
NOTE 1 Most annexes are normative. However, only the annexes relevant to each case are to be applied. If the choice<\/p>\n
is the global approach, then all normative annexes that belong to the component approach can be skipped and vice versa.<\/p>\n
NOTE 2 Pre-analytical sampling variance at the source is outside the scope of this International Standard, but needs<\/p>\n
to be addressed in sampling designs and monitoring programmes.<\/p>\n
NOTE 3 The doubt or uncertainty of decisions based on the use of analytical results whose uncertainty has been<\/p>\n
estimated is outside the scope of this International Standard.<\/p>\n
NOTE 4 The extra-analytical variations observed in proficiency tests and intercalibration schemes are also not<\/p>\n
detailed in this International Standard, but it is necessary to take them into consideration in analytical control. The use<\/p>\n
of intercalibration data in uncertainty estimation offers the possibility for the bias between laboratories to be included<\/p>\n
(Nordtest Report TR 537[12]).<\/p>\n","protected":false},"excerpt":{"rendered":"
Water quality \u2014 The variability of test results and the uncertainty of measurement of microbiological enumeration methods<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ISO<\/b><\/a><\/td>\n 2012-01<\/td>\n 68<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":611965,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[218,2634],"product_tag":[],"class_list":{"0":"post-611953","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-13-060-70","7":"product_cat-iso","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/611953","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/611965"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=611953"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=611953"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=611953"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}