ASTM-D7482 Standard Practice for Sampling, Storage, and Handling of Hydrocarbons for Mercury Analysis

ASTM-D7482 - 2017 R23 EDITION - CURRENT
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Standard Practice for Sampling, Storage, and Handling of Hydrocarbons for Mercury Analysis
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Scope

1.1 This practice covers the types of and preparation of containers found most suitable for the handling of hydrocarbon samples for the determination of total mercury.

1.2 This practice was developed for sampling streams where the mercury speciation is predominantly Hg(0) present as a mixture of dissolved Hg(0) atoms, adsorbed Hg(0) on particulates (for example, carbonaceous or mineral fines and Fe2O3) and suspended droplets of metallic mercury.

1.3 The presence of suspended droplets of metallic mercury (often called colloidal mercury, since the droplet size can be very small) can make obtaining a representative sample very difficult for a variety of reasons (for example, non-isokinetic sampling of the liquid can result in over- or under-collection of suspended droplets and collection of mercury that has accumulated in dense larger drops and pools on the bottom of piping and in sample taps). Pay strict attention to the detailed procedure (Section 7) to ensure representative samples are collected.

1.4 When representative test portions are collected and analyzed in accordance with acceptable procedures, the total mercury is representative of concentrations in the sample.

1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.6 Warning—Mercury has been designated by EPA and many state agencies as a hazardous material that can cause central nervous system, kidney, and liver damage. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury-containing products. See the applicable product Material Safety Data Sheet (MSDS) for details and EPAs website (http://www.epa.gov/mercury/faq.htm) for additional information. Users should be aware that selling mercury or mercury-containing products, or both, in your state may be prohibited by state law.

1.7 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.

Significance and Use

This practice is intended for use in sampling liquid hydrocarbons including crude oils, condensates, refinery process intermediates, and refined products. Generally these samples are expected to contain mercury from the parts per billion (10-9 mass) to parts per million (10-6 mass) range.

This practice is not intended for use when sampling aqueous systems where the concentrations of mercury are often in the parts per trillion (10-12 mass) range. These samples are often better addressed by using the rigorously clean techniques from the EPA Method 1669 clean hands, dirty hands sampling procedures.

This practice is not intended for use for liquefied samples, for which special containers may be required for pressurized samples.

The presence of mercury during crude oil production, transport, and refining can be an environmental and industrial hygiene concern.

Keywords

handling; mercury; mercury analysis; sampling; storage; ICS Number Code 71.040.40 (Chemical analysis)

To find similar documents by ASTM Volume:

05.04 (Petroleum Products and Lubricants (IV): D6973 - latest)

To find similar documents by classification:

71.040.40 (Chemical analysis Including analysis of gases and surface chemical analysis)

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Document Number

ASTM-D7482-17R23

Revision Level

2017 R23 EDITION

Status

Current

Modification Type

New

Publication Date

July 21, 2023

Document Type

Practice

Page Count

4 pages

Committee Number

D02.03