The phrase "analytical procedures have been" is correct and usable in written English.
It can be used in contexts discussing the application or results of analytical procedures in various fields, such as accounting or research.
Example: "In our audit, we found that analytical procedures have been effectively utilized to assess the financial statements."
Alternatives: "analytical procedures were conducted" or "analytical procedures have occurred".
A number of analytical procedures have been introduced that provide faster but somewhat less accurate results.
Since 1947 a number of analytical procedures have been introduced that provide faster but somewhat less accurate results.
The analytical procedures have been developed further and more compounds and lower detection limits were observed this time.
Based on the results two alternative analytical procedures have been proposed and validated for evaluation of buckling strength.
While several analytical procedures have been developed in the past to estimate track stiffness, there is no procedure readily available for estimating track damping.
The available analytical procedures have been found insufficient for the specific bellows design, considering the rather challenging size, load cases and non-standard trapezoidal shape of the DEMO upper port duct bellows.
A set of analytical procedures has been developed for identifying the locations for imposing charges and the charges at those points which are optimal in terms of economic efficiency.
Regulatory guidance for the validation of analytical procedures has been developed for drug product/formulation testing; however, verification of the formulation concentrations falls under the framework of GLP regulations (not GMP).
The results obtained by means of the analytical procedure have been confirmed, and therefore the large influence of pitch deviations on loading capacity of HCR spur gears has been verified.
Results The conditions for simultaneous determination of toxic impurities in the buffer solution by CE technique CE analytical procedure have been developed.
The details of the analytical procedure have been described previously (Wang et al. 2005).
