AOAC Test Method 990.08

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Method Name:
Metals in Solid Wastes by ICP. Official Name: Metals in Solid Wastes by Inductively Coupled Plasma Atomic Emission Method

Method measures element-emitted light by optical spectrometry. Digested materials are nebulized into radio-frequency inductively coupled plasma. Spectra of elements are dispersed by grating spectrometer, and intensities are measured by photomultiplier tubes. Correction for background and interferences is required.

Applicable to determination of Al, Sb, As, Ba, Be, Cd, Ca, Cr, Co, Cu, Fe, Pb, Mg, Mn, Mo, Ni, K, Se, Ag, Na, Tl, V, and Zn in coal fly ash, industrial and electroplating sludges, mine tailings, river sediments, and soils.

Official Methods of Analysis of AOAC International, 16th Edition, 4th Revision, 1998 Volume I

I. SPECTRAL INTERFERENCES: (1) Background emmission or stray light. (2) Spectral overlap of emissions.II. PHYSICAL INTERFERENCES: High viscosity or high particulate levels of sample can clog nebulizer.III. CHEMICAL INTERFERENCES: (1) Compound formation. (2) Ionization. (3) Solute-vaporization.IV. MEMORY INTERFERENCES: Carry-over from sample.

QC Requirements:
instrument check std. soln., interference check std. soln., quality control std. soln.



None given.

Precision and accuracy values were calculated using interlaboratory data from EPA-managed Water Pollution (WP) performance evaluation studies.

Estimated Instrument Detection Limits given in Table 990.08B of the method, along with the associated monitoring wavelengths.

Revision Number:
First Action - 1993

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