DOH/DEP asbestos fact sheet draft, 105 Duane Street

NYC 9/11 Public Portal Document 12/11/2001 17:08 FAX 212 353 8306 ATC 0 008

• D 5755

smaller components without losing its fibrous properties or 5. Significance and Use appearance. 5.1 This microvacuum sampling and indirect analysis 3.2 Descriptions of Terms Specific to This Standard method is used for the general testing of nonairborne dust 3.2.1 aspect ratio—the ratio of the length of a fibrous samples for asbestos. It is used to assist in the evaluation of particle to its average width. dust that may be found on surfaces in buildings such as 3.2.2 bundle—a structure composeed of three or more ceiling tiles shelving, electrical components, duct work, fibers in a parallel arrangement with the fibers closer than carpe, etc. This test method provides an index of the one fiber diameter to each other. concentration of asbestos structures in the dust per unit area 3.23 duster-a structure with 66ers in a random arranger analyzed as derived from a quantitative TEM analysis. meat such that all fibers are intermixed and no single fiber is 5.1.1 This test method does not describe procedures or isolated from the group; groupings of fibers must have more techniques required to evaluate the safety or habitability of than two points touching. buildings with as nos.containing materials, or compliance

3.2,.4 debris-materials that are of an amount and size with fe deral, state,

or local regulations or stattrsw. It

is the

(particles greater than I mm in diameter) that on be visually user's responsibility to make these determinations. Identified as to their source. 5.1.2 At present, a single direct relationship between 3.2.5 durst--any material composed of particles in a size asbestos-containing dust and potential human exposure does range of 1 mm and large enough to settle by virtue of their not exist. Accordingly.

the uses should consider these data in

from the ambient air (am definition for settleable weight re lationship

to other available information in

their evalua-

particulate matter in Test Method D 1739). tion. 3.2.6 a srudum having a minimum length of 0.5 5.2 This test method uses the definition, amicable partic- µm, an aspect ratio of 5:1 or greater, and substantially ulate material, found in Ten

Method D 1739 as the dcfin-

parallel sides (4). tion of dust. This definition accept$ all particles small

3.2.7 fibrous--of a mineral composed of parallel, radi- enough to pass through a 1 mm (No. 18) semen. Thus. a

ating, or interlaced aggregates of fibers, from which the fibers sing, large asides containing particle(s) (horn the large are sometimes separable. That the exystaltine aggrepte end of the particle size distribution) d'spaaed during sample preparation may result in anomalously large asbestos con- is,

may be referred to as fibrous even if it is not composed of separable'Sbers, but het that distiu cep issrsu e. The term centration results in the TEM analyses of that sample. It it, fibrous is used in a general mineralogical way to describe samples

ehereibre,

independent suoonint..ded that multiple

of grains that crystallize In a needle..lke habit and a minimum of three

are

the secured om fr and area, same

appear to be composed of fibers. Fibrous has a much more samples analysed by the entire procedure. general r+8 than asbestos. While it is cos that all asbestos minerals are fibrous, not all minerals having fibrous 6.

Interferences

habits am asbestos. 6.1 The following minerals have properties (that is, chem- 32.8 indirect preparations—a method in which a sample similar which to are very

structure) crystaJliue or ical

passes through one or more intermediate steps prior to final may

analysis by the with minerals

interfere

and

asbestos

filtration. canting a fa lse

positive

to be recorded during the

test.

s for these materials must be Therefore, literature references 3.19 »Quit--a structure in which one or more fibers, or maintained in the laboratory for comparison to asbestos fiber buadbes that are touching, arm attached to, or partially concealed by a tingle particle or connected group of non- asbestos as misidentified

not

are they that so minerals

fibrous particles. The exposed must meat the 65ber minerals.

ter al

definition (see 3.2.4, Antlgoike. 6.1.1

Patygausfdte (An te). 6.1.2

3.2.10 structues—a term that is used to categorize all the types of asbestos pattidcs which arc recorded during the Halloys 6.1.3

analysis (such as fibers, bundler, dusters, and masrlce 4 PymW suns . 6.1.4

Final results of the test are always expressed In asbestos Sepiaolits. 6.1.5

set ✓amlatlite 1

6.1.6

struettaus per square centimetre 6.1.7

Fibrous tak

those than

other

Hornblende and other ampbt'boles 6.1.8

. 4. Summary of Test Method in

listed 3.1.2.

aces

6.2

rticles in mm 1 grosser: pa dust any Collecting than

4.1 The sample is collected by vacuuming a known in this test method may cause an

in ri ce and. therefore,

surface area with a standard 25 or 37 mm air

sampling must be avoided.

cassette using a plastic tube that is attachnd to the inlet orifice which acts as a nozzle The sample is transferred from 7. Materials and Equipment

.

inside the casoe to an aqueous solution of known volume. 7.1 Pwby

g('Reagests-Reagent grade duals shalt be

Aliquors of the suspension are then filtered through a used in all teens. Unless athelrwige indicated, is is handed

membrane. A section of the membrane is prepared and that all reagents

conform to the mo ons of the Com-

transferred to a TEM grid using the direct hen method. er

mittee an Analytical Reaps of the American Cbermical

b. The asbestiform structures are identified, sized, and counted Society, where such sp eciflenicus are available. Other

grades

by ?EM, using SAED and EDXA at a ma r cation of may be us ed.

provided it is fist ascertained that

the relent

I5 t10) to 20 OOOX. is of sufficiently

high purity to permit its use without

NYC-WTC 000125905