Page:NIOSH Manual of Analytical Methods - 7029.pdf/1

 COPPER (dust and fume)

Cu

MW: 63.54

CAS: 7440-50-8 (Cu)

METHOD: 7029, Issue 2

7029

RTECS: GL5325000

EVALUATION: FULL

OSHA : 0.1 mg/m 3 (fume); 1 mg/m 3 (dust) NIOSH: 0.1 mg/m 3 (fume); 1 mg/m 3 (dust) ACGIH: 0.2 mg/m 3 (fume); 1 mg/m 3 (dust, mist)

Issue 1: 15 February 1984 Issue 2: 15 August 1994

PROPERTIES: soft metal; valence +1, +2 in salts MP 1083 °C

SYNONYMS: vary depending upon the compound; CAS #1317-39-1 (Cu 2O), CAS #1317-38-0 (CuO)

SAMPLING SAMPLER:

FILTER (0.8-µm cellulose ester membrane)

MEASUREMENT TECHNIQUE:

ATOMIC ABSORPTION, FLAME

ANALYTE:

copper

ASHING:

conc. HNO 3, 6 mL, 140 °C; conc. HCl, 6 mL, 400 °C

FLOW RATE: 1 to 3 L/min VOL-MIN: -MAX:

50 L @ 0.1 mg/m 3 1500 L

SHIPMENT:

routine

0.5 N HCl; 25 mL

FINAL SOLUTION:

SAMPLE STABILITY: BLANKS:

FLAME:

air-acetylene, oxidizing

stable

WAVELENGTH:

324.7 nm

2 to 10 field blanks per set

BACKGROUND CORRECTION: not required

ACCURACY

CALIBRATION:

standard solutions of Cu 2+ in 0.5 N HCl

RANGE:

5 to 125 µg per sample [4]

RANGE STUDIED: 0.05 to 0.59 mg/m 3 (fume) [1,2] 0.47 to 1.8 mg/m 3 (dust) [3]

ESTIMATED LOD: 0.05 µg per sample [5]

BIAS:

- 0.44%

PRECISION (Sr):

ˆ ): OVERALL PRECISION (S rT

0.044 (fume) [1,2] 0.051 (dust)[3] ± 11.0%

ACCURACY:

0.03 [1,3,5]

APPLICABILITY: The working range is 0.05 to 1.3 mg/m 3 for a 100-L air sample. This is an elemental analysis, applicable to either dust or fume, with an additional separation step to quantitate soluble copper dust (e.g., CuSO 4) in the presence of copper fume. Aliquots of the samples can be analyzed separately for many additional metals.

INTERFERENCES: Background correction is not required. Interferences to the fume/soluble dust separation step include insoluble copper compounds and copper compounds such as copper acetate which form insoluble hydroxides when dissolved in water.

OTHER METHODS: This method combines and replaces P&CAM 173 [5], S354 [4], and S186 [6]. Method 7300, plasma emission (ICP-AES), is an alternate analytical method.

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94