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Standard Practice for Estimation of Holding Time for Water Samples Containing Organic and Inorganic Constituents (Includes all amendments And changes 10/29/2018).
Automaticky preložený názov:
Štandardná prax pre odhad doby výdrže pre vodné Vzorky s obsahom organických a anorganických zložiek
NORMA vydaná dňa 1.1.2013
Označenie normy: ASTM D4841-88(2013)e1
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.1.2013
Kód tovaru: NS-28844
Počet strán: 6
Približná hmotnosť: 18 g (0.04 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
degredation, estimation, holding time, storage limit, water, ICS Number Code 13.060.30 (Sewage water)
Significance and Use | ||||||||||||||||
5.1 In order to obtain meaningful analytical data, sample preservation techniques must be effective from the time of sample collection to the time of analysis. A laboratory must confirm that sample integrity is maintained throughout maximum time periods between sample collection and analysis. In many cases, it is useful to know the maximum holding time. An evaluation of holding time is useful also in judging the efficacy of various preservation techniques. |
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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 analysis. 1.2 The maximum holding time is dependent upon 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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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. |
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2. Referenced Documents | ||||||||||||||||
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1.5.2013
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15.12.2013
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1.7.2013
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15.9.2011
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15.6.2012
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1.9.2012
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