定价： 571元 加购物车

4.1 Field QA demonstrates the effectiveness of field quality control procedures. Effective QA facilitates the collection of statistically significant data that is defendable scientifically and in a court of law. QA also involves the use of consistent procedures, increasing the validity of data comparison among sampling locations and events.4.2 This guide should be used by a professional or technician who has training or experience in groundwater sampling.1.1 This guide covers the quality assurance (QA) methods that may be used to assure the validity of data obtained during the sampling of a groundwater monitoring well. QA is any action taken to ensure that performance requirements are met by following standards and procedures. Following QA practices becomes even more critical if the data must be validated in a court of law. Under certain conditions, it may be necessary to follow additional or different QA practices from those listed in this guide. QA practices should be based upon data quality objectives, site-specific conditions, and regulatory requirements.1.2 This standard addresses QA procedures used in the field and does not refer to laboratory QA procedures.1.3 This standard also 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 to determine the applicability of regulatory limitations prior to use.1.4 This standard provides guidance for selecting and performing various field QA procedures. This document cannot replace education or experience and should be used in conjunction with professional judgement. Not all of the procedures are applicable in all circumstances. This ASTM standard is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged, nor should this document be applied without consideration of a project’s many unique aspects. The word “standard” in the title of this document means only that the document has been approved through the ASTM consensus process.

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定价： 646元 加购物车

This specification covers requirements for wipe sampling materials that are used to collect settled dusts on surfaces for the subsequent determination of lead. The wipes shall be tested for conformance to background lead, lead recoverability, collection efficiency, ruggedness which shall be determined using butted vinyl-composite floor tiles as a test surface, moisture content, coefficient of variation in mass, linear dimensions such as mean area and mean length, and mean thickness requirements.1.1 This specification covers requirements for wipes that are used to collect settled dusts on surfaces for the subsequent determination of lead.1.2 For wipe materials used for the determination of beryllium in surface dust refer to Specification D7707. This is mentioned to insure that users of wipes recognize that there is some relationship between the analytical backgrounds found in wipes and the analyte of interest.1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 加购物车

定价： 571元 加购物车

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定价： 571元 加购物车

定价： 646元 加购物车

定价： 571元 加购物车

定价： 571元 加购物车

定价： 646元 加购物车

定价： 571元 加购物车