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Find all the manufacturers of benchtop spectrophotometer and contact them directly on DirectIndustry. Experiment No. 4 SPECTROPHOTOMETRY Objectives 1. Examination of the essential components in a simple spectrophotometer- the Jenway 6100 & Perkin Elmer Lambda 40 2. Determination of absorption spectrum of a solution 3. Preparation of Beer's Law Plot Apparatus Spectrophotometer, Test tubes, Test tube rack. Specialty equipment. Our specialty is aquaculture, but there is significant overlap with other industries in terms of the equipment used (e.g.

(1) • Xylem Analytics Germany Sales GmbH & Co KG (3).

A method of tracing an aqueous liquid, particularly an aqueous urea used for addition to a selective catalytic reduction system to remove NOx from diesel exhaust includes adding a tracer comprising a pre-determined amount of a phenol to the liquid. 4cd Battle Dune Emperor Isosorbide. The liquid can subsequently be identified by reacting a sample with a reagent containing a predetermined amount of 4-aminoantipyrine in the presence of an initiating compound such that the reaction between the reagent and a phenol in the liquid produces a chromophore and measuring the absorbance of the resulting solution of the chromophore.

Heavy-duty diesel engines which are used largely in commercial vehicles are subject to increasing regulation of emission levels. It is therefore important to provide such engines with measures to reduce harmful emissions, especially particulates, and nitrogen oxides (NO x). Selective catalytic reduction (SCR) is a technology which has been introduced to reduce emissions of NOx by reducing the NOx to nitrogen. Ammonia-SCR systems react ammonia (NH 3) with the NOx to form nitrogen (N 2) and water (H 2O). There are three reaction pathways: •. A concern with the introduction of such an additive is the control and monitoring of the use of suitable quality product which conforms to the accepted regulatory standard. With the introduction of mandatory emission control measures in many countries, the use of SCR technology will become regulated and therefore liable to inspection.

Dilution of conforming Adblue or the use of Adblue from a non-conforming source should be capable of being monitored by the transport authorities' inspectors in order to ensure that vehicle emissions of NOx using SCR technology are suitably controlled. Photoacute 3 Crack. It is an object of the present invention to provide a tagging system for urea solutions for use in SCR systems and to provide a method of tagging urea and determining the source of a urea solution.

A) mixing an aqueous liquid with a tracer composition comprising at least one phenol to form a tagged aqueous liquid, and b) analysing a sample of said tagged aqueous liquid by reacting said sample with a reagent containing a pre-determined amount of 4-aminoantipyrine in the presence of an initiating compound such that the reaction between the reagent and a phenol in the liquid produces a chromophore and c) measuring the absorbance of light of the resulting solution of the chromophore to determine the concentration of said tracer compound. In the comparison method, it is not necessary to determine the absorbance of light of the resulting solution of the chromophore prepared from the reference sample each time a target sample is analysed. It may be convenient to compare the light absorbance from a solution prepared from the target sample with a pre-determined absorbance measurement from a standard reference sample. This absorbance measurement may be programmed into a measurement instrument which is adapted to facilitate the comparison of a target sample with a standard reference. In steps b) and c) of the comparison method it is optionally provided that the concentration of the tracer compound in the target and/or reference sample is calculated from the absorbance measurement, usually by comparison with a calibration of the absorbance using known standard concentrations of the tracer compound. It is not necessary for the calculation of the concentration of tracer compound to be performed if the comparison method is performed in order to determine whether the target sample contains the tracer compound at a concentration similar or identical to the tracer concentration in the reference compound. According to a further aspect of the invention, a method of tracing an aqueous liquid comprises adding to said liquid a tracer comprising a pre-determined amount of a phenol, subsequently sampling said liquid, reacting said sample with a reagent containing a pre-determined amount of 4-aminoantipyrine in the presence of an initiating compound such that the reaction between the reagent and a phenol in the liquid produces a chromophore and measuring the absorbance of the resulting solution of the chromophore.