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&EPA United States Environmental Protection Agency Research and Development Test Method Environmental MOnltonng and Support Laboratory Cincinnati OH 45268 Inductively Coupled Plasma- Atomic Emission Spectrometric Method for Trace Element Analysis of Water and Wastes-Method 200.7 1 Scope and ApplicatIon 1 1 This method may be used for the determination of dissolved suspended, or total elements In drinking water, surface water domestic and Industnal wastewaters 1 2 Dissolved elements are determined In filtered and aCidified samples Appropnate steps must be taken In all analyses to ensure that potential Interference are taken Into account This IS especially true when dissolved solids exceed 1500 mg/L (See 5) 1 3 Total elements are determined after appropnate digestion procedures are performed Since digestion techniques Increase the dissolved solids content of the samples, appropnate steps must be taken to correct for potential Interference effects (See 5 ) 1 4 Table 1 lists elements for which this method applies along with recommended wavelengths and typical estimated Instrumental detection limits uSing conventional pneumatic nebulization Actual working detection limits are sample dependent and as the sample matnx vanes, these concentrations may also vary In time, other elements may be added as more information becomes available and as required 1 5 Because of the differences between vanous makes and models of satisfactory Instruments, no detailed Instrumental operating instructions can be provided Instead, the analyst IS referred to the instructions provided by the manufacturer of the particular Instrument 2 Summary of Method 2 1 The method descrrbes a technique for the simultaneous or sequential multielement determination of trace elements In solution The basIs of the method IS the measurement of atomic emiSSion by an optical spectroscopic technique Samples are nebulized and the aerosol that IS produced IS transported to the plasma torch where excitation occurs Charactenstlc atomic-line emiSSion spectra are produced by a radio-frequency inductively coupled plasma (ICP) The spectra are dispersed by a grating spectrometer and the intensities of the lines are mOnitored by photomultiplier tubes The photocurrents from the photomultiplier tubes are processed and controlled by a computer system A background correction technique IS required to compensate for vanable background contnbutlon to the Metals-20 Dec 1982PDF Image | Methods for Chemical Analysis of Water and Wastes
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