Calibration curves

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  • More than twenty years after the idea of this Carotenoids book series was first discussed, we finally reach the end of the project with Volume 5, which covers the functions and actions of carotenoids in human nutrition and health. In 1971, in Isler’s book Carotenoids, functions of carotenoids and vitamin A were covered in just two chapters.

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  • Mobile telephone technology should be used (where coverage allows this) to automatically download data centrally, followed by automated QA checks and input to a database. Data should be made available over the internet, updated on at least a daily basis. Locally based staff should visually check systems at least once a month and make a preliminary investigation of any anomalous results. Calibration and basic maintenance must be carried out during an annual visit by specialist staff. Installation and site characteristics should follow ECN protocols (Sykes & Lane, 1996).

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  • A simple analytical method was developed for determination of chloride content in polymeric materials. The procedure comprises of two steps, the dissolution of the polymer by alkaline fusion followed by indirect spectrophotometric analysis of the chloride based on the absorption at 460 nm of Fe(SCN)2+, a product of the reaction between chloride ion and a mixture of mercury (II) thiocyante and ferric ion. A non-linear calibration curve was constructed from 0.5 to 20 ppm with R2 = 0.9991; the limit of detection and quantitation were of 0.325 and 1.083 ppm, respectively.

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  • In heavy-duty applications, where fuel economy is a top priority, lean deN Ox systems using a selective catalytic reduction (SCR) approach are an interesting alternative. Such systems can reduce engine-out N Ox by approximately one order of magnitude. This permits the engine to be calibrated at the high-efficiency/low-PM boundary of the trade-off curve (see Fig. 1.11, early injection angle). The drawback of this approach is, of course, the need for an additional fluid distribution infrastructure (most likely urea).

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