Quantitative procedure

Samples of urine that do not contain quinine still contain a small amount of fluorescent material after the extraction steps. Flow can the quantitative procedure described earlier be modified to take this into account ... 

Several quantitative procedures for concentrations above 0.1 vol % are available. Gas chromatographic analysis (78) is particularly useful because it is fast, accurate, and relatively inexpensive. The standard wet-chemical, analytical method (76) takes advantage of the reaction between iodine pentoxide and carbon monoxide at 423 K. 

PIF EVALUATION SCALE (QUALITATIVE AND QUANTITATIVE) PROCEDURES PHYSICAL WORK ENVIRONMENT... 

Moisture, Analytical Procedures. Various quantitative procedures have been developed ranging from simple oven drying thru sophisticated instrumental methods (Expls Refs 31,33,42,47, 52, 56, 57,60 62 Proplnts Refs 25,28,29,... 

Detection in HPLC by ultraviolet absorption is commonplace and does not merit special mention here (see Section F.l below). There appear to be only few quantitative procedures for sulphones which are based on measurements of UV absorption. The final stage in a determination of the acaricide Sulphenone by Shuman29 was differential measurement of the absorption at 230,240 and 250 nm in isooctane solution. Kashiwa and... 

Both positive- and negative-ion Cl spectra can be generated and the interface provides molecular weight information, plus it can also be used for sensitive quantitative and semi-quantitative procedures. 

It is well known that electrospray ionization (El) suffers from suppression effects when polar/ionic compounds other than the analyte(s) of interest, such as those originating from the sample matrix, are present, with this phenomenon being attributed to competitive ionization of all of the appropriate species present [33]. Matrix effects can, therefore, be considerable and these have two distinct implications for quantitative procedures, as follows ... 

Lohman PHM. 1999. Qualitative and quantitative procedures for health risk assessment. Mutat Res 428 237-254. 

Chernomorsky, S., Quantitative procedure for chlorophyllin copper complex. Technical Communications, J. AOAC Internal., 11, 765, 1994. 

As XRF is not an absolute but a comparative method, sensitivity factors are needed, which differ for each spectrometer geometry. For quantification, matrix-matched standards or matrix-correction calculations are necessary. Quantitative XRF makes ample use of calibration standards (now available with the calibrating power of some 200 international reference materials). Table 8.41 shows the quantitative procedures commonly employed in XRF analysis. Quantitation is more difficult for the determination of a single element in an unknown than in a known matrix, and is most complex for all elements in an unknown matrix. In the latter case, full qualitative analysis is required before any attempt is made to quantitate the matrix elements. 

Standard thin films of known composition may not always be available, and in multi-component systems many k factors should be determined, which is a time-consuming process. A new quantitative procedure for thin specimens has been developed to overcome these limitations ... 

Ismail F and Eskin NAM. 1979. A new quantitative procedure for determination of Sinapine. J Agric Food Chem 27 (4) 917—918. 

A quantitative procedure should be validated for selectivity, calibration model, stability, accuracy (bias, precision), linearity, and limit of quantification (LOQ). Additional... 

Borenfruend, E. and Puemer, J.A. (1984). A simple quantitative procedure using monolayer cultures for cytotoxicity assays. J. Tissue Culture Meth. 9 7-9. 

Irwin, S. (1968). Comprehensive observational assessment la. A systematic, quantitative procedure for assessing the behavioral and physiologic state of the mouse. Psychopharma-cologia (Berlin) 13 222-257. 

Select one of the quantitation procedures we have discussed (response factor method, internal standard method, or standard addition method) and describe ... 

The rise in popularity of HPLC is due in large part to its high-performance nature and the advantages offered over the older, noninstrumental open-column method described in Chapter 11. Separation and quantitation procedures that require hours and sometimes days with the open-column method can be completed in a matter of minutes, or even seconds, with HPLC. Modern column technology and gradient solvent elution systems, which will be described, have contributed significantly to this advantage in that extremely complex samples can be resolved with ease in a very short time. 

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