Bromide determination

The double titration method, which involves the use of ben2ylchloride, 1,2-dibromoethane, or aUyl bromide, determines carbon-bound lithium indirectly (101,102). One sample of the //-butyUithium is hydroly2ed directly, and the resulting alkalinity is determined. A second sample is treated with ben2ylchloride and is then hydroly2ed and titrated with acid. The second value (free base) is subtracted from the first (total base) to give a measure of the actual carbon-bound lithium present (active base). 

The effect of variation of the length of the pyridinium alkylating agent was also investigated by Zhu et at. (1992d). It was found that both the counterion and the hydrophobic ty of the quaternization agent (alkyl iodide or bromide) determined whether the surface micelles were surface-adsorbed (starfish conformation) or were submerged (jellyfish conformation). In one extreme, the C]0 and C 8 alkyl chain derivatives formed starfish micelles at low surface pressures. In... 

Other inorganic reagents utilized in spectrophotometric methods are hydrogen peroxide (see determination of Ti, V, U, and Ce), SnCU ion (determination of platinum group elements [136]), iodide (see determination of Sb, Bi, and Pd), bromide (determination of Au), and also chloride and azide. 

The analytical methods used to verify the between-ampoule homogeneity were ETAAS (Al, Cd, Cu, Pb and Ni) and HGAAS (As). No inhomogeneities could be detected for any of these elements in both CRMs [17]. For bromide, determinations were carried out by ion chromatography the materials were both found to be homogenous [18]. 

Human dietary intake of bromine is large and variable. Duggan and Lipscomb (1971) obtained an average intake over 2 years from U S diets of 24 mg Br per day, while Greve (1983) calculated from the results of bromide determination in 100 Dutch duplicate meals a mean bromide intake of 7.8 and 7.6 mg per person per day, respectively, with a range from 1.8 to 17.2 mg. 

Bromide determinations in the blood are performed primarily for the monitoring of patients treated with bromo-sedatives, anesthetized with halothane, or suffering from drug abuse. 

ICP-MS methods Chlorine, bromine, and iodine were measured by Tagami et al. [50] in aqueous samples using inductively coupled plasma-mass spectrometry (ICP-MS). Since iodine has only one stable isotope, m/z = 127 was scanned for iodine determination. For chloride and bromide determination m/z of 35 and 79 were, respectively, applied. Cesium (m/z = 133) was used as an internal standard during ICP-MS determination to monitor the change in counting efficiency. 

The bromide ions absorbed at 200 nm can be detected by UV detector. This can be exploited in analysis of bromine content of raw or drinking water. Rovio et al. [66] worked out a capillary electrophoresis method for bromide determination. They used 5 mM formic acid and 42 mM NaCl (pH 3.5) in Milli-Q water as carrier electrol)de. 

Didecyldimethylammonium chloride and dodecyltrimethylammonium bromide determination in beer C15-C18 dialkyldimethylammonium, dialkylmethyl-2-hydroxyethylam-monium, and dialkylmethylpoly (oxyethylene)-ammonium salts determination in laundry detergent C14-C20 dialkylimidazolium quats separation by total alkyl chain length... 

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