By William K. Fletcher
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Extra resources for Analytical Methods in Geochemical Prospecting
With colorimetry, AAS and other techniques where calibration is simple and frequent, this should not be a problem unless the calibration standards themselves deteriorate. However, if photographic methods of recording signal intensity are used, as in ES, preparation of standard films may be very infrequent and drift, both long and short term, can occur for a variety of reasons. Physical and chemical interferences Physical and chemical characteristics of a sample influence the liberation of trace elements during sample decomposition, and constituents taken into solution along with the analyte can be a source of interference during analysis.
Solid lines separate fields containing, on the average, (/) more than five grains of the special mineral; (//) between one and five grains; and (///) less than one grain. the accessory mineral and the gangue contribute equally to the overall content. 36 XI0" 7 . At concentrations above and below this the sampling error decreases. The latter trend, however, would be of little practical significance if errors from other sources were rising rapidly towards the detection limit of the analytical method.
148642 . 05 z o CO \ Ü 111 cc Q. 20 100 k U·CONCENTRATION, c Fig. 2-5. 05. The detection limit (d = 11) is the concentration corresponding to P = ±100%. ment performance obtained in an ideal matrix and under ideal conditions with respect to stability so that in some cases a higher multiple of σ0 is proposed as a more realistic "working" limit. However, the most meaningful estimate of a laboratory detection limit can be obtained, as described here, as part of the routine monitoring of laboratory precision.
Analytical Methods in Geochemical Prospecting by William K. Fletcher