Page:NIOSH Manual of Analytical Methods - 7306.pdf/1

 ELEMENTS by Cellulosic Internal Capsule Sampler AW: Table 1

CAS: Table 2

METHOD: 7306, Issue 1 OSHA PELs: NIOSH RELs: OTHER OELs:

EVALUATION: FULL

cadmium calcium chromium cobalt copper

indium iron lanthanum lead lithium

magnesium manganese molybdenum nickel phosphorus

potassium selenium silver strontium tin

SAMPLING SAMPLER:	 Internal capsule, cellulose acetate dome with inlet opening, attached to 0.8-μm pore size mixed cellulose ester (MCE) membrane filter and housed within a 2-piece, closed-face cassette (CFC) filter holder, 37-mm diameter

FLOWRATE: 	 1 to 4 L/min VOL-MIN: -MAX:

Table 1 Table 1

Issue 1: 10 September 2015

tellurium thallium titanium tungsten vanadium

yttrium zirconium zinc

MEASUREMENT

TECHNIQUE:

INDUCTIVELY COUPLED PLASMA – ATOMIC EMISSION SPECTROMETRY (ICP-AES)

ANALYTES:

Elements above

SAMPLE DISSOLUTION:

Hotplate digestion (NIOSH 7300 or 7301), microwave digestion (NIOSH 7302) or hot block extraction (NIOSH 7303) Dependent upon sample preparation method

WAVELENGTH:

Depends upon element; See Table 3

Minimum of 2 field blanks per set

BACKGROUND CORRECTION:

Spectral wavelength shift

ACCURACY

CALIBRATION:

Elements in acid matrix-matched to the sample; varies depending on sample preparation method

RANGE:

Varies with element

SAMPLE STABILITY:	 Stable

RANGES STUDIED:

Tables 3 and 4

BIAS:

Table 4

OVERALL PRECISION (ŜrT) Table 4 ACCURACY:

SOLUTION:

SHIPMENT:	 Routine

BLANKS:

RTECS: Table 2

PROPERTIES: 	Table 1

Table 2 Table 2 [1,2]

ELEMENTS: aluminum antimony arsenic barium beryllium

7306

Table 4

ESTIMATED LOD:	 Table 3 PRECISION ( Sr ):	 Table 4

APPLICABILITY: The working range of this method is 4 x 10-5 mg/m3 to 10 mg/m3 for each element in a 500-L air sample. This is simultaneous elemental analysis, not compound specific. Verify that the types of compounds in the samples are soluble with the dissolution procedure selected. Some compounds of these elements require special sample treatment. INTERFERNCES: Spectral interferences are the primary interferences encountered in ICP-AES analysis. These are minimized by judicious wavelength selection, interelement correction factors and background correction [3,4]. OTHER METHODS: The internal capsule sampler used in this method is a recommended alternative to filter-only sampling [5] of NIOSH methods 7300 [6], 7301 [7], 7302 [8] and 7303 [9]. Use of an internal capsule sampler is an efficient means to account for sampler wall deposits that would otherwise be excluded by filter-only sampling. Unless other means are used to account for non-filter deposits inside the cassettes (e.g. within-cassette extraction, rinsing or wiping), internal capsule samplers should be used. OSHA method ID-125G [10] describes ICP-AES multielement analysis after hotplate digestion using nitric acid, sulfuric acid and hydrogen peroxide. ASTM D7035 [11] and ISO 15202 [12] are related voluntary consensus standard ICP-AES methods for multielement sampling and analysis of workplace atmospheres.

NIOSH Manual of Analytical Methods (NMAM), Fifth Edition