Time required for analysis

For a set of 10 samples, the analytical method can be completed within 16 laboratory hours from the time of sample weighing to GC injection. 

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Seligson s group (95) has published a similar turbidimetric procedure but used nephelometry to measure continuously the effect of lipase on the light scattering of an olive oil emulsion. The instrumentation and approach is the same as that described above for the nephelometric determination of amylase. The method according to the authors is fast and precise with good specificity and sensitivity. The short time required for analysis makes it suitable for emergency use. The technical simplicity permits this method to be easily automated, and it appears to be the lipase method of choice. 

Time efficiency coefficient (treq time required for analysis, tana real analysis time)... 

Figure 20.1—Proportion of the time spent in each stage of a chromatographic analysis. Sample preparation generally represents a large fraction of the total time required for analysis (LC-GC Inti. 1991,4(2)).

When the samples were sent out, a postcard for acknowledging safe receipt was included. We used the dates on these postcards to mark the start of analysis. On the questionnaire (our Document 3 question 7) a space was supplied for the length of time required for analysis. Few laboratories performed their analyses and returned results within the time they indicated on the questionnaire. This is not surprising. In fact, the length of time required was requested so that we would know when to write the laboratory and ask for their results. 

Copper, Chromium, Manganese, and Nickel. The analytical method for determining copper, chromium, manganese, and nickel involves digesting the coal with nitric and perchloric acids, fusing the residue with lithium metaborate, and determining the combined digestion and leach solutions by atomic absorption spectrophotometry. Since there is no standard material to analyze for the construction of calibration curves, the standard additions method is used for the assay. While this method increases the time required for analysis, it helps to eliminate the effect of the matrix. 

Run Time The time for one complete injection and analysis, including any autosampler time required between injections. Run time is critical to determining the overall time required for analysis of a number of samples. 

The analytical methodology must meet realistic expectations regarding sensitivity, accuracy, reliability, precision, interferences, matrix effects, limitations, cost, and the time required for analysis (Keith et al., 1983). Selection of the optimum analytical method is one of the most important factors influencing the reliability of data (Keith, 1980, 1991 ACS, 1983). 

Among analytical techniques, the pyrolytic procedures can be applied for microorganism identification due to their sensitivity, need for a minute amount of sample, applicability to a wide range of microorganisms, and the relatively short time required for analysis [1]. Several problems are related to the use of pyrolytic techniques for microorganism characterization. Some are related to sample preparation and are not specific to pyrolytic procedures, while others are related to the pyrolytic technique itself. 

Three features can be readily identified in this trajectory of emission spectrographic instrumentation. First, there has been a steady decrease in the size of the instrument. Second, there has been a steady decrease in the amount of time required for analysis. Third, there has been a steady decrease in the amount of training required of the operators of the instrument. 

Rapidity is one of conditions for laboratory quality control. The time needed to develop an analytical process must be as short as possible. The length of time required influences the efficiency of analytical process since, as everyone is well aware, "time is money." The time an analytical process takes influences the cost of the analysis. It is also very important to consider the influence and effect of time on the aging of the analytical method. Automation of the analytical process, for all practical purposes, fulfulls the rapidity requirements. The rapidity of the analytical process is dependent on the reliability of the analytical method and that of the instrument. An increase in the reliability of an analytical process decreases the time required for analysis, and the use of computers for data processing decreases the time needed for analytical signal processing. 

It is very important to assure the quality of the standards themselves. The reliability of the analytical method and the reliability of the analytical process increases if standards are used. The time required for analysis is shorter, and the quality and reliability of the analytical information improves. 

The main limitation of standard TLC techniques is the time required for analysis. Due to the particle size (20 pm) of adsorbent materials, the developing time is usually > 30 min. This is too long considering additional time for measurements and quantification. 

Composition Chromatographic analyzers Long times required for analysis... 

Recently, high speed GPC has become used more and more frequently. It is carried out under increased pressure of the eluent and, therefore, special equipment has to be employed. Analytical uses thus prevail. The time required for analysis is several times shorter and more accurate results are obtained than with the conventional procedure. For details see section 4.6.3.9. 

S uzuki et al. report a hybrid triple quadrupole/linear ion trap MS/MS technique. The triple quad-rupole-linear ion trap LC/MS combines the scan speed and sensitivity of ion trap MS while retaining the selective scanning modes of triple quadrupole MS. The ability to perform both types of MS on a single instrument reduces the time required for analysis while eliminating the chance of errors due to analyzing different samples in multiple MS runs. The method, coupled with LC separation, was demonstrated to be usefuUy applied to the structure elucidation of YTX analogues. ... 

Controlled potential electrolysis (potentiostatic control) requires a three-electrode cell, so as not to polarize the reference electrode. Controlled potential methods enable one to be very selective in depositing one metal from a mixture of metals. If two components have electrochemical potentials that differ by no more than several hundred millivolts, it may still be possible to shift these potentials by complexing one of the species. One disadvantage of exhaustive electrolysis is the time required for analysis, and faster methods of electrochemical analysis are described. 

Time required for analysis Preparation Measurement Evaluation 0 to 10 minutes 0.5 to 10 minutes 10 to 30 minutes... 

An important consideration for online coupling of microdialysis sampling and conventional LC separation is the time required for analysis and the relatively high sample volume requirements... 

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