< div class=" SectionLevel2" > < p class=" subsec1 cdone2" > < span class=" Head3 cdone" > 1.1< / span> & #x00a0 This standard specifies flame and graphite furnace atomic absorption spectrometric methods for the determination of the time-weighted average mass concentration of particulate lead and lead compounds in workplace air.

< / div> < div class=" SectionLevel2" > < p class=" subsec1 cdone2" > < span class=" Head3 cdone" > 1.2< / span> & #x00a0 The method is applicable to personal sampling of the inhalable fraction of airborne particles, as defined in ISO 7708, and to static (area) sampling.

< / div> < div class=" SectionLevel2" > < p class=" subsec1 cdone2" > < span class=" Head3 cdone" > 1.3< / span> & #x00a0 The sample dissolution procedure specifies hot plate or microwave digestion, or ultrasonic extraction (< span class=" Body-link1 cdone" > 10.2< / span> ). The sample dissolution procedure is not effective for all lead compounds (see Section < span class=" Body-link1 cdone" > 5< / span> ). The use of an alternative, more vigorous dissolution procedure is necessary when it is desired to extract lead from compounds present in the test atmosphere that are insoluble using the dissolution procedures described herein. For example if it is desired to determine silicate lead, a hydrofluoric acid dissolution procedure is required.

< / div> < div class=" SectionLevel2" > < p class=" subsec1 cdone2" > < span class=" Head3 cdone" > 1.4< / span> & #x00a0 The flame atomic absorption method is applicable to the determination of masses of approximately 1 to 200 & #x03bc g of lead per sample, without dilution < span style=" font-weight:bold " class=" overriddenformat" > (< span class=" Body-link1 cdone" > 1< / span> )< / span> .< span style=" font-style:normal " > < span class=" footnote-link" > 2< / span> < / span> The graphite furnace atomic absorption method is applicable to the determination of masses of approximately 0.01 to 0.5 & #x03bc g of lead per sample, without dilution < span style=" font-weight:bold " class=" overriddenformat" > (< span class=" Body-link1 cdone" > 1< / span> )< / span> .

< / div> < div class=" SectionLevel2" > < p class=" subsec1 cdone2" > < span class=" Head3 cdone" > 1.5< / span> & #x00a0 The ultrasonic extraction procedure has been validated for the determination of masses of approximately 20 to 100 & #x03bc g of lead per sample, for laboratory-generated lead fume air filter samples < span style=" font-weight:bold " class=" overriddenformat" > (< span class=" Body-link1 cdone" > 2< / span> )< / span> .

< / div> < div class=" SectionLevel2" > < p class=" subsec1 cdone2" > < span class=" Head3 cdone" > 1.6< / span> & #x00a0 The concentration range for lead in air for which this procedure is applicable is determined in part by the sampling procedure selected by the user (see Section < span class=" Body-link1 cdone" > 9< / span> ).

< / div> < div class=" SectionLevel2" > < p class=" subsec1 cdone2" > < span class=" Head3 cdone" > 1.7< / span> & #x00a0 Anions that form precipitates with lead may interfere, but this potential interference is overcome by the addition of the disodium salt of ethylenediamine tetraacetic acid (EDTA) when necessary.

< / div> < div class=" SectionLevel2" > < p class=" subsec1 cdone2" > < span class=" Head3 cdone" > 1.8< / span> & #x00a0 The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.

< / div> < div class=" SectionLevel2" > < p class=" caveat cdone2" > < span class=" Head3 cdone" > 1.9< / span> & #x00a0 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.

< / div> < div class=" SectionLevel2" > < p class=" WTOcaveat cdone2" > < span class=" Head3 cdone" > 1.10< / span> & #x00a0 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.

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