นิยาม ของ Blank Solution และ ของแถม
Blank Solution - Solution that is free of the analyte(s) of interest. Such a solution would be used to develop specific types of blank samples as described below.
Environmental data - any measurements or information that describe environmental processes, location, or conditions; ecological or health effects and consequences; or the performance of environmental technology. For EPA, environmental data include information collected directly from measurements, produced from models, and compiled from other sources such as data bases or the literature.
Field Blank - a blank solution that is subjected to all aspects of sample collection, field processing, preservation, transportation, and laboratory handling as an environmental sample.
Filter Blank - a blank solution that is filtered in the same manner and through the same filter apparatus used for an environmental sample.
Preservation Blank - a blank solution that is treated with the same preservatives used for an environmental sample.
Refrigerator Blank - a blank solution that is put in the same type of bottle used for an environmental sample and stored adjacent to an environmental sample in a refrigerated storage area.
Sampler Blank - a blank solution that is poured or pumped through the same field sampler used for the collection of an environmental sample.
Trip Blank - a blank solution that is put in the same type of bottle used for an environmental sample and kept with the set of sample bottles both before and after sample collection.
Blind Sample - A sample submitted for analysis whose composition is known to the submitter but unknown to the analyst.
Certified Reference Material (CRM) - A reference material, for which one or more property values are certified by a technically valid procedure, accompanied by or traceable to a certificate or other documentation which is issued by a certifying body.
Concurrent Samples - A type of replicate sample in which the samples are collected by two or more people collecting samples simultaneously or by one person alternating subsamples between two or more collection bottles.
Double Blind Sample - A sample whose composition is known by the submitter but submitted to an analyst in such a way that neither its composition nor its identification as a check sample are known to the latter.
Duplicate Analysis - The analysis or measurement of the variable of interest performed as identically as possible on two subsamples of a sample.
Duplicate Sample - The special case of replicate samples that consists of two samples.
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