Astm D 4841 – 88 (Reapproved 2003) pdf free download

Standard Practice for
Estimation of Holding Time for Water Samples Containing
Organic and Inorganic Constituents1

This standard is issued under the fixed designation D 4841; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This practice covers the means of estimating the period
of time during which a water sample can be stored after
collection and preservation without significantly affecting the
accuracy of the analysis.

1.2 The maximum holding time is dependent upon the
the matrix used and the specific analyte of interest. Therefore,
water samples from a specific source must be tested to
determine the period of time that sample integrity is maintained
by standard preservation practices.

1.3 In the event that it is not possible to analyze the sample
immediately at the time of collection, this practice does not
provide information regarding degradation of the constituent of
interest or changes in the matrix that may occur from the time
of sample collection to the time of the initial analysis.

1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents

2.1 ASTM Standards:
D 1129 Terminology Relating to Water2
D 1192 Specification for Equipment for Sampling Water
and Steam in Closed Conduits2
D 1193 Specification for Reagent Water2
D 2777 Practice for Determination of Precision and Bias of
Applicable Methods of Committee D-19 on Water2
D 3694 Practices for Preparation of Sample Containers and
for Preservation of Organic Constituents3
D 4210 Practice for Intralaboratory Quality Control Procedures and a Discussion on Reporting Low-Level Data2
D 4375 Practice for Basic Statistics in Committee D-19 on
Water2