Page:NIOSH Manual of Analytical Methods - 7303.pdf/3

 ELEMENTS by ICP (Hot Block/HCl/HNO3 Ashing): METHOD 7303, Issue 1, dated 15 March 2003 - Page 3 of 6 MEASUREMENT: 13. Set spec trome ter to conditions spe cified by manufac turer. 14. Analyze standards, samples and quality control checks. NOTE: If the elemental value for a sam ple is above the linear ran ge of the elem ent(s) in que stion, d ilute the sample solution with 5% HCl : 5% HNO 3 diluting solution, reanalyze a nd apply the appro priate dilution factor in the calculations.

CALCULATIONS: 15. Obta in the solution con cen trations for the sam ple, C s (:g/mL), and the average m edia blank, C b (:g/m L), from the ins trum ent. 16. Using the solution volumes of sam ple, V s (m L), an d m edia blank, V b (mL), calculate the concentration, C (m g/m 3), of each elem ent in the air volum e sam pled, V (L):

NO TE : :g/L / m g/m 3

EVALUATION OF METHOD: The m eth od was evaluated for all elements and compounds listed in Table 1 and Table 2 between 1999 and 2001 using known am oun ts of b ulk m aterial [4]. Evaluation is ongoing for additional elements and com pounds. The limits of detection and quantitation were also determined for each element. Two ICP instruments were used in the evalua tion, a Thermal Jarrell Ash Model 61E [5] and a TJA IRIS [6], operated acc ording to the m anu facturer's instru ctions.

REFERENCES: [1] W OHL [2001]. Metals validation using hot block digestion, Unpublished data. W isconsin Occupational He alth La bora tory, Madison, W I. [2] NIOSH [1994]. Metho d 73 00: E lem ents by ICP, NIO SH Ma nua l of Analytical Metho ds, F ourth Edition, Issue 2, Aug. 15, 1994. [3] W OHL [2001]. Metals Manual 2001, W OHL Inte rnal D ocum ent, Update d Apr. 1, 2 001. W isconsin Oc cup ationa l Hea lth Lab orato ry, Madison, W I. [4] W OHL [2001]. W OHL G eneral Operations Procedures Manual, W OHL Internal Docum ent, Updated 200 1. W isconsin Oc cup ationa l Hea lth Lab orato ry, Madison, W I. [5] Thermal Jarrell Ash [1991]. IC AP 61E P lasm a Spectrom ete r O perator's M anual, The rm al Jarrell Ash Corp., Part No. 128832-01, Feb., 1991. [6] Thermal Jarrell Ash [1997]. IRIS Plasm a Spectro m eter User's Guide, Thermal Jarrell Ash Corp., Part No. 135811-0, Feb. 4, 1997.

METHOD WRITTEN BY: Jason Loughrin, Lyle Reichmann, Doug Sm ieja, Shakker Amer, Curtis Hedman W isconsin Oc cupational Health Labora tory (W OH L).

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition