Particular analyses

Chemical Analysis Second Edition Francis and Annick Rouessac 

---

Thus the rationale for LIMS technology in the R D lab is not just an improvement in productivity or in the speed at which particular analyses can be completed, but also lies in the lab s ability to complete entire task projects in shorter time. 

A theoretical approach to the design of CSPs has been started using molecular orbital theory and computer simulation.46 It is hoped that this approach will provide the basis for designing new phases for particular analyses. 

For a review see G. J. Minkoff and C. F. H. Tipper, ref. 39, p. 89 and sequel. For particular analyses, the reader should consult current literature on combustion. 

Analysers capable of determining several analytes in a single sample require suitable Introduction systems. The samples are split into small volumes whose magnitude depends on the particular analyser. Figure 3.7 depicts two of... 

Inorganic components (including pollutants) in the soil may be present in different forms, which should be taken into account when analysing the soil. From this standpoint, particularly analyses are of interest, which provide data on those trace elements which are chemically available for the biosphere. The total content of trace elements in soils [1] is of less importance from the chemical standpoint. 

For routine assays requiring analysis of large numbers of samples, micro-titre or multi-well plate readers have been developed. These consist of single-beam instruments in which the samples are contained in standard 96-well (8x12) plates, each well containing a separate sample. This allows large numbers of samples to be measured rapidly, often automatically under robotic control. The multi-well/micro-titre plates themselves are often coated with specific reagents so that particular analyses may be done rapidly and routinely in situ. 

Hence anodic stripping voltammetry is the method of choice for the analysis of very low concentrations of heavy metal ions in water and effluents. Pulse and differential pulse polarography also have their advocates for particular analyses but they do not have the same general acceptance. 

One other development in support of analytical data quality must be mentioned, namely the use of round robin analysis, which has developed into a number of laboratory performance assessment programs, and also known as proficiency-testing schemes. A proficiency-testing scheme does not eliminate the need for a quality system. In fact, the scheme can at best provide only a snapshot of how a laboratory was performing on particular analyses on one occasion. Moreover, such schemes still exist only for a fairly limited range of sample and analyte combinations. 

We particularly analysed the hydrogen halide - amine systems because they have the advantage to be accessible by high-level theoretical methods as well as by gas phase experiments. 

In the limited sense of being able to perform particular analyses on a certain class of samples, such automatic devices are already commercially available. 

This technique " is particularly useful for ultra-trace analysis of solid samples in that it eliminates most of the problems of reagent blanks and/or sample contamination during analysis. The large number of variables (such as type and energy of irradiating particle, time of irradiation and measurement, type of detector used, etc.) that can be judiciously altered for particular analyses make the technique relatively free from serious systematic errors or biases. A typical value for the random errors is + 5 % at the 100-ng level. 

---