Page:NIOSH Manual of Analytical Methods - 9110.pdf/1



BERYLLIUM in Surface Wipes by Field-Portable Fluorometry Be

MW: 9.0121

METHOD: 9110, Issue 1

CAS: 7440-41-7

EVALUATION: PARTIAL

U.S. regulatory OELs OSHA:	 none for surfaces MSHA:	 none for surfaces DOE:	 3 µg per 100 cm2 (housekeeping, 10 CFR 850.30[a]), 0.2 µg per 100 cm2 (equipment release, 10 CFR 850.31) Other published OELs and guidelines OTHER:	none for surfaces

9110

RTECS: DS175000 Issue 1: 6 April 2007

PROPERTIES:	solid, d 1.85 g/mL, MP 1,278 °C, VP 0 kPa (0 mm Hg) @ 25 °C

SYNONYMS:	beryllium metal SAMPLING SAMPLER:	 WIPE (cellulosic)

MEASUREMENT TECHNIQUE:

FIELD-PORTABLE UV/VIS FLUOROMETRY

ANALYTE:

complex of hydroxybenzoquinoline sulfonate (HBQS) with beryllium

SHIPMENT:	 routine

DISSOLUTION:

ammonium bifluoride (aqueous), 10 g/L

SAMPLE STABILITY:	 stable

DETECTION SOLUTION:

WIPE AREA:	 100 cm2 minimum

BLANKS:

2 to 10 field blanks ACCURACY

contains 63.4 µmol/L HBQS, 2.5 mmol/L EDTA, and 50.8 mmol/L lysine monohydrochloride; pH adjusted to 12.85 with 10 mol/L NaOH

DETECTOR:

excitation, 360 nm to 390 nm; emission, 400 nm to 700 nm (λmax ≈ 475 nm)

CALIBRATION:

beryllium standard solutions

OVERALL PRECISION (ŜrT):	not studied

RANGE:

(0.005 to 6) µg per wipe [1]

ACCURACY:

ESTIMATED LOD:	0.00075 µg per wipe [2]

RANGE STUDIED:

not studied

BIAS:

not studied

not studied

PRECISION (S¯r):

0.021 at ≈0.2 µg per wipe, 0.076 at ≈1.5 µg per wipe, 0.052 at ≈3 µg per wipe

APPLICABILITY: The working range of the method is 0.005 µg to 6 µg for surface wipe samples. The analysis is for total beryllium and is not compound specific. INTERFERENCES: Minor interference from iron can result if iron concentrations are high. Samples high in iron demonstrate a yellow or gold coloration. This interference can be minimized by allowing the solution to sit for at least four hours, during which time the solution clears, and then filtering the sample extract before use. OTHER METHODS: Method 7300 (hot plate digestion and inductively coupled plasma atomic emission spectrometry) is an alternative (reference) procedure for the determination of elemental beryllium [3]. ASTM method D7202 is a similar procedure to detect elemental beryllium by fluorescence [4].

NIOSH Manual of Analytical Methods (NMAM), 5th Edition (Electronic)

Updated: 04/06/2007