|
Table
7. IR* sampling and analytical methods for crystalline
silica
|
|
Item
|
NIOSH
Method 7602
|
NIOSH
Method 7603
|
MSHA
P–7
|
MDHS
37
|
MDHS
38
|
|
Matrix
|
|
Coal
mine dust
|
Coal
mine dust
|
|
|
Sampler
|
10-mm
nylon cyclone,
1.7 L/min; Higgins-Dewell cyclone,
2.2 L/min
|
10-mm
nylon cyclone,
1.7 L/min; Higgins-Dewell cyclone,
2.2 L/min
|
10-mm
nylon Dorr-Oliver cyclone,
2.0 L/min
|
Higgins-Dewell
cyclone,
1.9 L/min
|
Higgins-Dewell
cyclone,
1.9 L/min
|
|
Filter
|
37-mm
filter; 5-µm PVC or MCE
membrane
|
37-mm
filter;
5-µm PVC
membrane
|
37-mm
filter;
5-µm PVC
membrane,
preweighed
|
37-mm
filter;
5-µm PVC
membrane
|
37-mm
filter;
5-µm PVC
membrane
|
|
Volume
|
400–800
L; total dust <2 mg
|
300–1,000
L; total dust <2 mg
|
Not
stated
|
>456 L; total dust <1 mg
|
>456 L;
total dust
<0.7mg
|
|
Filter
preparation
|
RF
plasma asher or muffle furnace
|
RF
plasma asher or muffle furnace
|
RF
plasma asher
|
None
|
Muffle
furnace
|
|
Analytical
sample preparation
|
Mix
residue with
KBr, press
13-mm pellet
|
Redeposit
on
0.45-µm acrylic
copolymer filter
|
Redeposit
on
0.45-µm acrylic
copolymer filter
|
None
|
Mix
residue with KBr, press 13-mm pellet
|
|
Standard
|
Polystyrene
film
|
Polystyrene
film
|
Polystyrene
film
|
Polystyrene
film
|
Polystyrene
film
|
|
Calibration
|
Quartz
diluted in
KBr
|
Standard
suspension of quartz in
2-propanol
|
Standard
suspension of quartz in
2-propanol
|
Sampling
from a generated atmosphere of standard quartz dust
|
Sampling
from a generated atmosphere of standard quartz dust
|
|
Proficiency
testing
|
PAT
|
PAT
|
PAT
|
WASP
|
WASP
|
|
Range
( µg quartz)
|
10–160
|
30–250
|
25–250
|
10–1,000
|
5–700
|
|
LOD
( µg quartz)
|
5
(estimated)
|
10
(estimated)
|
10
|
Varies
with
particle size
|
Varies
with
particle size
|
|
Precision
|
___
RSD<0.15 @ 30 µg
|
___
RSD = 0.098 @ 100–500 µg
|
CV
=
5–10% @ 100–500 µg
|
CV = 5%
@ 50 µg
|
CV
= 5%
@ 50 µg
|
|
*Abbreviations:
CV = coefficient of variation (equivalent to RSD, relative standard
deviation); IR = infrared absorption; KBr = potassium bromide; MCE
= methyl cellulose ester; MDHS = Methods for the Determination of
Hazardous Substances (Health and Safety Executive, United Kingdom);
MSHA = Mine Safety and Health Administration; NIOSH = National Institute
for Occupational Safety and Health; LOD = limit of detection; PAT
= proficiency analytical testing; PVC = polyvinyl chloride; RF =
radio frequency;
___ __
RSD= pooled relative standard deviation (equivalent to CV pooled
coefficient of variation); WASP = Workplace Analysis Scheme for
Proficiency.
|
