Titration test

Weigh to 0.1 mg 2.5 to 3 g of the purified aniline, transfer to a 1 1 volumetric flask contg 900 ml distd w and 50 ml coned HCl. Fill the flask to the mark and shake it until the soln is uniform. Transfer a 100 ml aliquot to a 400 ml beaker, add 10 ml coned HCI and cool the soln to 15°. Titrate slowly with the 0.2N KBrO,-KBr soln. Near the end of titration, test, after the addition of each drop of die soln, by spotting KI-starcH test paper. The end point is indicated by the It blue coloration which can be duplicated after a 2-tnin period. When the end point is reached, an addnl drop of the KBrOj KBr soln will color the mixt yel, thereby corroborating the end point indicated hy the test paper. Calculate the normality of KBrOs KBr by the following formula ... 

The curves show that, before calcination of the powder, the pH rise is very steep but tapers off at pH 10. In contrast, the pH of the calcined powder increases very slowly at a constant rate. This constant rate of increase in the pH helps to produce Mg-based phosphate ceramics in large sizes and makes the process practical. Most commercially available MgO exhibits very high dissolution rates in acid solutions, and its calcination becomes a necessity for production of ceramics at a commercial scale. The titration test provides a good method for testing these powders for their suitability for CBPC formation. 

Some of the former pharmacopoeial methods are not always entirely relevant. This applies particularly to the titration tests of vinylpyrrolidone or aldehydes, as the methods are not specific and inaccurate, and therefore no longer do justice to the purity of povidone availabe today. For this reason, the harmonized monograph Povidone introduced an HPLC method for vinylpyrrolidone and an enzymatic test for acetaldehyde. 

Differences in the temporal development of release rates for the individual elements are connected with their sorption/desorption behaviour, which is primarily due to pH-effects but may also be influenced by com-plexation, e.g. by elevated concentrations of chloride ions. With respect to the pH-effects, however, there are significant differences in the response of the various solid substrates to the addition of H+-ions, and it may be argued that the pH-values on the solid surfaces -which can be estimated from "pH-titration tests" - are decisive for the behavior of the particular element rather than the pH-values determined in solution. 

Liberators of antithrombin and/or heparin cofactor. The latter proteins appear to be secreted by the liver, and result in hypocoagulability in thrombin titration tests and increase the sensitivity of the coagulation time and other tests to heparin. Papain releases antithrombin. ... 

The aim is to have a constant system involving capture antibody (ABx), antigen (Ag), and conjugate (Anti-Ab E), which can then be used to titrate test sera (Aby). We have already dealt with the use of capture antibody as whole serum or as IgG. For this exercise, we use sheep anti-guinea pig IgG (or the equivalent in an individual s systems). Thus, examination of the data in Table 10 allows an estimation of the optimum capture IgG and antigen levels required to allow detection of antibodies. 

Pauli, A.T. Asphalt compatibility testing using the automated Heithaus titration test. Prep. Div. Fuel Chem., American Chemical Society, 1996, 41,1276-1281. 

Proper operation of the SulFerox process requires good solution maintenance procedures. It is quite important to maintain the proper levels of iron, pH, additive concentration, and solids in the circulating solution. All these solution parameters must be regularly monitored by utilizing appropriate spectro-photometric, gravimetric, and titration test... 

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