Page:NIOSH Manual of Analytical Methods - 7302.pdf/1

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‌ MW: Table 1

CAS: Table 2

RTECS: Table 2

METHOD: 7302, Issue 1

EVALUATION: FULL

Issue 1: 21 July 2014

OSHA: Table 2 NIOSH: Table 2 Other OELs: [1,2]*

PROPERTIES:

Table 1

cadmium lead phosphorus strontium yttrium ELEMENTS: aluminum antimony calcium lithium platinum tellurium zinc

SAMPLING SAMPLER:

FILTER (mixed cellulose ester membrane (MCE), 37-mm diameter, 0.8-µm pore size)

FLOW RATE: 1 to 4 L/min VOL-MIN: -MAX:

Table 1

SHIPMENT: Routine SAMPLE STABILITY: Stable BLANKS:

2 to 10 field blanks per set ACCURACY

MEASUREMENT TECHNIQUE:

INDUCTIVELY COUPLED ARGON PLASMA, ATOMIC EMISSION SPECTROSCOPY (ICP-AES)

ANALYTE:

Elements listed above

REAGENTS:

10.0 mL of 1:1 nitric (HNO3) and ASTM Type II water

FINAL SOLUTION:

20% HNO3, 25 mL

WAVELENGTH:

Depends upon element (see Table 3)

BACKGROUND CORRECTION:

Spectral wavelength shift

RANGE STUDIED:

See Table 4

CALIBRATION:

Elements in 20% HNO3

ACCURACY:

See Table 4

RANGE:

See Table 4

BIAS:

See Table 4

ESTIMATED LOD: Table 3

OVERALL ˆ PRECISION ( S

rT

):

See Table 4

PRECISION ( Sr ) : Table 3

APPLICABILITY: This method is for the analysis of metal and nonmetal dust collected on MCE filters in the workplace. The working range varies from element to element. The method entails simultaneous elemental analysis using a microwave digestion approach to simplify and expedite the analysis. INTERFERENCES: Spectral interferences are the primary interferences encountered in ICP-AES analysis. These are minimized by judicious wavelength selection, inter-element correction factors and background correction [3]. OTHER METHODS: This method complements NIOSH hotplate digestion methods 7300 and 7301 for trace elements. Flame atomic absorption spectroscopy (e.g., Methods 7013 through 7082) is an alternative analytical technique for many of these elements [4]. Graphite furnace AAS (e.g., 7102 for Be, 7105 for Pb) is usually more sensitive [4]. NMAM 7301 and 7303 contain alternative extraction procedures.

NIOSH Manual of Analytical Methods (NMAM), Fifth Edition