Standard Guide for Demonstrating and Assessing Whether a Chemical Analytical Measurement System Provides Analytical Results Consistent with Their Intended Use

Importancia y uso:

4.1 This guide is intended for use by both generators and users of analytical results. It is intended to promote consistent demonstration and documentation of the quality of the measurement results and facilitate determination of the validity of measurements for their intended use.

4.2 This guide specifies documentation that a laboratory should supply with the analytical results to establish that the resulting measurements: (1) meet measurement quality requirements; (2) are suitable for their intended use; and (3) are technically defensible.

4.3 While the guide describes information that the measurement results provider needs to give the user/decision maker, in order for measurement providers to supply data users with appropriate data, information is needed from the data user. Examples of information that the user should provide to the laboratory, in addition to the analytes of concern (including the form of the analyte that is to be determined, for example, total lead, dissolved lead, organic lead, inorganic lead), include but are not limited to:

4.3.1 Type of material (that is, matrix—fresh or salt water, coal fly ash, sandy loam soil, wastewater treatment sludge),

4.3.2 Maximum sample holding time,

4.3.3 Projected sampling date and delivery date to the laboratory,

4.3.4 Method of chemical preservation (for example, not preserved, chemical used),

4.3.5 Chain-of-custody requirements, if any,

4.3.6 Analytical methods that must be used, if any,

4.3.7 Measurement quality requirements expressed as DQOs or MQOs and action limits,

4.3.8 Allowable interferences as described in 10.4,

4.3.9 Documentation requirement, and

4.3.10 Subcontracting restrictions/requirements.

4.4 Users/decision makers should consult with the laboratory about these issues during the analytical design stage. This will allow the design of sample collection process and project schedule to accommodate the laboratory activities necessary to determine the desired level of measurement quality. The number of samples, budgets, and schedules should also be discussed.

Subcomité:

D34.01.01

Referida por:

D5681-23, E3439-25

Volúmen:

11.04

Número ICS:

71.040.40 (Chemical analysis)