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This δ-calibration method is the only one that permits a quantitative determination of very small traces when the basic material of the sample cannot be obtained completely free from impurities. When the calibration curve scanned by successive additions shows a reasonable course, then it may be possible to extrapolate this function downwards and thereby deter­ mine the unknown content which was originally present in the analytical 49 H. KAISER sample. The main problem is to ensure that the added quantity of the com­ ponent is in the same physical and chemical condition as that part of the component which was originally present or which was previously added.

Everything is there: the distance from the bottom of the basin to the normal depth of the keel is the "blank measure" and the small difference of the two readings is the "net measure". Calibration is necessary in order to find the relation of the difference in position of the keel (the "signal") and the difference in weight. ) by rocking the ship. This up and down movement of the keel may be big enough to completely mask the small displacement which is to be measured. In this case the weight of the captain is below the "limit of detection" of this ingeneous method.

02 in routine work; it was calibrated for the desired short range with three standard samples. 035 mm to allow precise photographic intensity measurements. This background—the blank measure under the analysis line—appeared relatively weak with the chosen exposure and did not immediately suggest the need for elimination. The points I, II and III for the standard samples are directly measured without subtracting the background intensity. What will happen in practice? The analyst, not knowing the shape of the curve and being uncertain about the accuracy of the concentrations given for the standards, and considering the possible errors of his measured values, will assume a straight line as the probably correct analytical function.

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