Acceptance procedure

The legal basis for the sale of fertilizers throughout the world is laboratory evaluation of content as available nitrogen, phosphorus, and potassium. By convention, numerical expression of the available nutrient content of a fertilizer is by three successive numbers that represent the percent available of N, P20, and K O, respectively. Thus, for example, a 20—10—5 fertilizer contains available nitrogen in the amount of 20% by weight of N, available phosphoms in amount equivalent to 10% of P2O5, and available potassium in amount equivalent to 5% K O. The numerical expression of these three numbers is commonly referred to as the analysis or grade of the fertilizer. Accepted procedures for laboratory analysis are fixed by laws that vary somewhat from country to country. 

Toxic substances adsorbed on resins are removed during a regeneration procedure. The resulting spent regeneration solution has a higher concentration of the toxic substance than the stream from which it was removed by the resin. Toxic material in the spent regenerating solution can usually be precipitated, electrodeposited as in an electrolytic ceU, or made insoluble by other acceptable procedures. 

These various problems may arise under several different circumstances. For example, difficulties may result from consistently poor operational control of the boiler plant or from enforced operating conditions that fall outside generally accepted procedures. Alternatively, problems may stem from malfunctioning equipment, from equipment design flaws, from inadequate water treatment programs, or even as a result of poor interpretation of monitored results and bad water treatment advice. 

This problem removes the cupreine method as an acceptable procedure for the Pediatric Laboratory for glucose analysis under any circumstances ... 

The development of sensitive and inexpensive immunoassays for low molecular weight pesticides has been an important trend in environmental and analytical sciences during the past two decades. 0.27-29 jq design an immunoassay for a pesticide, one can rely on the immunoassay literature for agrochemicals, " but many of the innovations in clinical immunoanalysis are also directly applicable to environmental analysis. - Conversely, the exquisite sensitivity required and difficult matrices present for many environmental immunoassay applications have forced the development of technologies that are also useful in clinical immunoassay applications. In the following discussion we will describe widely accepted procedures for the development of pesticide immunoassays. 

There is concern in the food analytical community that although methods should ideally be validated by a collaborative trial, this is not always feasible for economic or practical reasons. As a result, IUPAC guidelines are being developed for single laboratory method validation to give information to analysts on the acceptable procedure in this area. These guidelines should be finalised by the end of 2001. 

The experimental procedures were essentially the same as reported (Figure 1, (16, 17)). Reagents other than those described in (16. 17) were as follows. Acrylic acid(Wako Pure Chemicals) was distilled once under reduced pressure under a nitrogen stream. Solvents(acetonitrile, n-hexane, and benzene) were purified by accepted procedures. 

The difficulties of understanding population changes of litter-decomposing microflora and microfauna as an index of pollutant effects suggest that a more simple approach should be used at the outset. The least sophisticated expression of accepted procedure is ... 

An economical, practical, and environmentally acceptable procedure was elaborated for oxidative deprotection of trimethylsilyl ethers to their corresponding carbonyl compounds. The reaction proceeded in a solventless system, within a short period of time, and yields were good. On irradiation in a conventional microwave for 30 s, trimethylsilyl ether of benzyl alcohol in the presence of mont-morilonite KIO and finely grounded Fe(N03)3 9H2O gave rise to benzaldehyde in 95% yield. The applicability of this method was tested with several aromatic, alicyclic, and aliphatic trimethylsilyl ethers. Duration did not exceed 1 min, and yields were not lower than 80% (Mojtahedi et al. 1999). 

Flunisolide - Because of the possibility of higher systemic absorption, monitor patients using flunisolide for any evidence of systemic corticosteroid effect. If such changes occur, discontinue slowly, consistent with accepted procedures for discontinuing oral corticosteroids. When flunisolide is used chronically at 2 mg/day, monitor patients periodically for effects on the HPA axis. 

The RP must ensure that system documentation in general is comprehensive, current, and readily available to users. In terms of the RP s responsibility for assuring adequate acceptance procedures for software and hardware changes, documentation of acceptance testing can be a part of the approval process preceding the integration of new or changed software into laboratory production. Test data, with anticipated and actual results, should be permanently filed. 

A significant step in the numerical solution of packed bed reactor models was taken with the introduction of the method of orthogonal collocation to this class of problems (Finlayson, 1971). Although Finlayson showed the method to be much faster and more accurate than that based on finite differences and to be easily applicable to two-dimensional models with both radial temperature and concentration gradients, the finite difference technique remained the generally accepted procedure for packed bed reactor model solution until about 1977, when the analysis by Jutan et al. (1977) of a complex butane hydrogenolysis reactor demonstrated the real potential of the collocation procedure. 

This example illustrates that there is no guarantee that results are reliable, even if they are obtained by "accredited " laboratories using accepted procedures. A good way to assess the reliability of a lab working for you is to provide the lab with blind samples—similar to your unknowns—for which you know the right answer, but the analyst does not. If the lab does not find the known result, there is a problem. Periodic blind check samples tire required to demonstrate continuing reliability. 

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