Selection of test methods

Test methods for corrosivity of solvent systems for removing water-formed deposits Recommended practice for determining corrosivity of adhesive materials Guide to the selection of test methods for coatings used in light-water nuclear power plants... 

Dynamic properties tests on viscoelastic materials fall into the general categories of resonance tests and non-resonance tests (1). They can be further subdivided into tests using base motion excitation (2), (3) and direct force excitation (4), (5). Still another classification may be made according to whether the specimen is stressed in extension, shear, or dilatation. An important issue in the selection of test methods is whether it will... 

The list below is a summary of test methods that are most likely to be required during the testing of most common dosage forms (tablets, capsules, and solutions). The list is by no means an exhaustive (since test methods to determine moisture content, pH, sterility, particulate matter, and microbial testing are not listed) and the selection of test methods depends on an evaluation of a dosage form and also on the phase of drug development. For each type of test, most common techniques utilized are listed in square brackets. As can be seen, HPLC can be employed for aU of the following test methods. 

D5886-95 Standard Guide for Selection of Test Methods to Determine Rate of Fluid Permeation Through Geomembranes for... 

BS PD 2777 [58] contains information about the development of BS 5438, while Appendix C of BS 5438 gives advice on the selection of test methods and acceptance criteria. 

As explained, there is no single set of rules designating what tests are to be conducted. Tests depend on required performance (as explained in the beginning of this chapter). Guides to selection of test methods have been reviewed (see Tables 9-1 to 9-7). Table 9-8 reviews tests for RP/composites. 

Such test methods can be used to compare the many variables in material composition, manufacturing, and field performance. The tests also can be used to compare different types of material, or the same material grade from various manufacturers using different manufacturing process, and to evaluate different corrosion control measures. However, the objective set of variables for the test dictates the selection of test methods. Therefore, a careful study of both process and material (physical. 

In general terms, the presence of two or more of the structural features indicated above in the same compound will tend to increase the risk. The selection of compound groups and of individually indexed compounds below includes compounds known to have been involved or those with a multiplicity of such structural features which would be expected to be especially susceptible to peroxide formation. A more recent and thorough review of peroxidation risks gives a critical assessment of test methods for peroxides [8],... 

To avoid brittle fracture during operation, maintenance, transportation, erection, and testing, good design practice shall be followed in the selection of fabrication methods, welding procedures, and materials for vendor furnished steel pressure retaining parts that may be subjected to temperature below the ductile-brittle transition point. 

The selectivity of the method is usually investigated by studying its ability to measure the analyte of interest in test portions to which specific interferences have been deliberately introduced (those thought likely to be present in samples). Where it is unclear whether or not interferences are already present, the selectivity of the method can be investigated by studying its ability to measure the analyte by comparison with other independent methods or techniques. 

Brown NA (2002) Selection of test chemicals for the ECVAM international validation study on in vitro embryotoxicity tests. European Centre for the Validation of Alternative Methods. Altern Lab Anim 30 177-198... 

Sample shape and size are of considerable importance when selecting dynamic test methods for solid propellants. Preparation must take account of surface conditions and precise dimensions. Usually cast specimens retain a polymer-rich surface layer and should be avoided. Additionally, the sample dimensions should be large compared with the size of the largest solid particle inclusion in the propellant. 

SPE. However, LLE may reduce the sample loss, experiment procedures and errors, and save time in comparison to SPE [8, 25, 28], In contrast, if a larger amount of sample is available, e.g., 2-10 mL of urine or 1-10 L of environmental water, SPE is a better choice, because it concentrates the sample and minimizes the interferences from other materials, leading to a higher sensitivity and selectivity of the method or test [34, 37, 39], The sample extraction throughput can be significantly enhanced by using automated 96-well SPE plates [31,49],... 

While there are many applicable methods reported in the literature, this paper was restricted to a subjective selection of testing procedures in the hope that it would stimulate the development of better analytical techniques, recognizing that there is always a limitation of validity for each method and evaluation of results. Analysis of carbon materials and especially of the carbonization process will never lose its attraction as a fascinating application of the art of black magic. 

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